TACOMA, Wash., July 27, 2017 /PRNewswire/ -- Hadley Robbins, President and Chief Executive Officer of Columbia Banking System and Columbia Bank (NASDAQ: COLB) ("Columbia"), said today upon the release of Columbia's second quarter 2017 earnings, "I'm pleased with our record setting earnings for the quarter, especially in light of the impact of the $2.4 million expense we recognized to terminate our FDIC loss sharing agreements, which when combined with the $1.0 million of acquisition-related expense recorded in the quarter, reduced our earnings per share by $0.04." Mr. Robbins continued, "Our record first half 2017 earnings is a direct reflection on the efforts of our bankers, who remain focused on developing new relationships while deepening existing ones."

Balance Sheet

Total assets at June 30, 2017 were $9.69 billion, an increase of $157.8 million from March 31, 2017. Loans grew $194.9 million during the quarter due to strong loan originations of $316.2 million and seasonal increases in line utilization. Securities available for sale were $2.26 billion at June 30, 2017, a decrease of $66.7 million, or 3% from $2.33 billion at March 31, 2017. Total deposits at June 30, 2017 were $8.07 billion, a decrease of $16.4 million from March 31, 2017. Core deposits comprised 96% of total deposits and were $7.72 billion at June 30, 2017, a decrease of $72.8 million from March 31, 2017. The average cost of total deposits for the quarter was 0.05%, an increase of one basis point from the first quarter of 2017.

Income Statement

Net Interest Income

Net interest income for the second quarter of 2017 was $86.2 million, a decrease of $514 thousand from the linked period and an increase of $4.0 million from the prior year period. The linked quarter decrease was principally from taxable securities income, whose yields during the first quarter of 2017 benefited from a market-driven reduction in premium amortization. Also contributing to the decrease was incremental accretion from purchased loans, which was $956 thousand lower than the linked period. The increase from the prior year period was due to higher loan and securities volumes, partially offset by lower incremental accretion. Incremental accretion income from purchased loans in the current period was $1.3 million lower than the prior year period. For additional information regarding net interest income, see the "Average Balances and Rates" table.

Noninterest Income

Noninterest income was $24.1 million for the second quarter of 2017, a decrease of $724 thousand compared to $24.9 million for the first quarter of 2017. The linked quarter decrease was principally due to lower bank owned life insurance ("BOLI") benefits in the current period as well as a $573 thousand benefit from re-measuring our mortgage repurchase liability in the linked period. Both the BOLI and mortgage repurchase benefits were recorded to other noninterest income. Compared to the second quarter of 2016, noninterest income increased by $2.2 million due to lower expenses from the FDIC loss-sharing asset as well as higher other noninterest income, principally from a current quarter BOLI benefit of $430 thousand, with no such BOLI benefit in the prior year period.

Noninterest Expense

Total noninterest expense for the second quarter of 2017 was $68.9 million, a decrease of $119 thousand from the first quarter of 2017. The small improvement resulted from lower compensation costs being offset by the $2.4 million charge from early termination of our FDIC loss-sharing agreements; the early termination charge was recognized in other noninterest expense. The lower compensation costs stemmed from additional stock compensation expense recognized in the linked quarter due to the immediate vesting of certain restricted share awards as well as additional payroll taxes.

Compared to the second quarter of 2016, noninterest expense increased $5.1 million, or 8%, from $63.8 million. The increase was due to the previously noted charge from early termination of loss-sharing agreements as well as $1.0 million of acquisition-related expenses recognized in the current quarter. In addition, legal and professional fees were higher due to costs from both our investment in a customer relationship management application and the search for a permanent Chief Executive Officer.

Net Interest Margin

Columbia's net interest margin (tax equivalent) for the second quarter of 2017 was 4.12%, a decrease of 8 basis points from the linked quarter and an increase of 2 basis points from the prior year period. The decrease from the linked quarter was due to higher linked quarter interest income from taxable securities, which was driven by reduced amortization of premiums as well as lower incremental accretion in the current quarter. The increase from the prior year quarter was due to higher loan and security volumes, partially offset by lower incremental accretion. Columbia's operating net interest margin (tax equivalent)((1) )was 4.09% for the second quarter of 2017, unchanged from the linked quarter and an increase of 9 basis points from the prior year period due to higher loan and security volumes.

The following table shows the impact to interest income resulting from income accretion on acquired loan portfolios as well as the net interest margin and operating net interest margin:



                                                                                         Three Months Ended                                                        Six Months Ended

                                                       June 30,         March 31,           December 31,             September 30,    June 30,               June 30,              June 30,

                                                            2017               2017                   2016                       2016          2016                    2017                   2016
                                                            ----               ----                   ----                       ----          ----                    ----                   ----

                                                                                                            (dollars in thousands)

    Incremental accretion income due to:

    FDIC purchased credit impaired loans                           $753                                      $2,117                                  $1,199                                        $1,816            $1,300             $2,870 $2,957

    Other acquired loans                                   2,356                     1,948                                     3,087                   2,749                               3,074               4,304              6,147
                                                           -----                     -----                                     -----                   -----                               -----               -----              -----

    Incremental accretion income                                 $3,109                                      $4,065                                  $4,286                                        $4,565            $4,374             $7,174 $9,104
                                                                 ======                                      ======                                  ======                                        ======            ======             ====== ======


    Net interest margin (tax equivalent)                   4.12%                    4.20%                                    4.11%                  4.13%                              4.10%              4.16%             4.12%

    Operating net interest margin (tax equivalent) (1)     4.09%                    4.09%                                    3.99%                  4.03%                              4.00%              4.09%             4.01%


    __________

    (1)              Operating net interest margin
                     (tax equivalent) is a non-GAAP
                     financial measure. See the
                     section titled "Non-GAAP
                     Financial Measures" on the last
                     page of this earnings release
                     for the reconciliation of
                     operating net interest margin
                     (tax equivalent) to net
                     interest margin.

Asset Quality

At June 30, 2017, nonperforming assets to total assets were 0.42% compared to 0.32% at March 31, 2017 and 0.35% at December 31, 2016. Total nonperforming assets increased $10.8 million from the linked quarter due to an $11.3 million increase in nonaccrual loans, partially offset by a decrease in other real estate owned.

The following table sets forth information regarding nonaccrual loans and total nonperforming assets:



                                                              June 30, 2017             March 31, 2017    December 31, 2016
                                                              -------------             --------------    -----------------

                                                                                  (in thousands)

    Nonaccrual loans:

    Commercial business                                                     $24,747                      $10,848             $11,555

    Real estate:

    One-to-four family residential                                      697                          450                 568

    Commercial and multifamily residential                            7,267                       10,237              11,187
                                                                      -----                       ------              ------

    Total real estate                                                 7,964                       10,687              11,755

    Real estate construction:

    One-to-four family residential                                      241                          213                 563
                                                                        ---                          ---                 ---

    Total real estate construction                                      241                          213                 563

    Consumer                                                          3,872                        3,799               3,883
                                                                      -----                        -----               -----

    Total nonaccrual loans                                           36,824                       25,547              27,756

    Other real estate owned and other personal property owned         4,058                        4,519               5,998

    Total nonperforming assets                                              $40,882                      $30,066             $33,754
                                                                            =======                      =======             =======

The following table provides an analysis of the Company's allowance for loan and lease losses:



                                                Three Months Ended                                         Six Months Ended

                              June 30,          March 31,               June 30,              June 30,            June 30,
                                   2017               2017                     2016                   2017                 2016
                                   ----               ----                     ----                   ----                 ----

                                                                       (in thousands)

    Beginning balance                   $71,021                                       $70,043                                    $69,264               $70,043 $68,172

    Charge-offs:

    Commercial business         (3,600)                       (1,127)                           (2,941)                        (4,727)     (6,714)

    One-to-four family
     residential real estate      (153)                         (307)                              (35)                          (460)        (35)

    Commercial and
     multifamily residential
     real estate                      -                             -                              (26)                              -        (26)

    One-to-four family
     residential real estate
     construction                     -                          (14)                                 -                           (14)           -

    Consumer                      (465)                         (428)                             (334)                          (893)       (600)

    Purchased credit impaired   (1,800)                       (1,939)                           (2,898)                        (3,739)     (5,764)
                                 ------                         ------                             ------                          ------       ------

    Total charge-offs           (6,018)                       (3,815)                           (6,234)                        (9,833)    (13,139)

    Recoveries:

    Commercial business           2,944                            365                                753                           3,309        1,415

    One-to-four family
     residential real estate        223                            117                                 20                             340           61

    Commercial and
     multifamily residential
     real estate                    127                             78                                130                             205          199

    One-to-four family
     residential real estate
     construction                    58                             29                                  5                              87          259

    Commercial and
     multifamily residential
     real estate construction         -                             -                                 1                               -           2

    Consumer                        248                            285                                201                             533          366

    Purchased credit impaired     1,204                          1,144                              1,524                           2,348        3,075
                                  -----                          -----                              -----                           -----        -----

    Total recoveries              4,804                          2,018                              2,634                           6,822        5,377
                                  -----                          -----                              -----                           -----        -----

    Net charge-offs             (1,214)                       (1,797)                           (3,600)                        (3,011)     (7,762)

    Provision for loan and
     lease losses                 3,177                          2,775                              3,640                           5,952        8,894
                                  -----                          -----                              -----                           -----        -----

    Ending balance                      $72,984                                       $71,021                                    $69,304               $72,984 $69,304
                                        =======                                       =======                                    =======               ======= =======

The allowance for loan losses to period end loans was 1.14% at both June 30, 2017 and March 31, 2017. For the second quarter of 2017, Columbia recorded a net provision for loan and lease losses of $3.2 million compared to a net provision of $2.8 million for the linked quarter and $3.6 million for the comparable quarter last year. The net provision for loan and lease losses recorded during the current quarter consisted of $3.9 million of provision for loan losses for loans, excluding PCI loans, partially offset by a provision recovery of $738 thousand for PCI loans.

Andy McDonald, Columbia's Executive Vice President and Chief Credit Officer, commented, "Our nonperforming assets ratio of 42 basis points reflects the strength of our regional economy and the diversification within our loan portfolio."

Organizational Update

Mr. Robbins commented, "Our pending acquisition of Pacific Continental Corporation is progressing. As announced last month, we have received the required shareholder approvals to complete the merger. Once the remaining regulatory approvals are obtained, we look forward to joining these two great companies together to the benefit of our customers, shareholders and the communities we serve. In addition, we regularly evaluate the alignment of our products and services with the needs of our clients. Given rapid technology changes in the payments industry, we are shifting our merchant card services business to an industry leading, third-party provider. We believe this transition will better serve our business clients via a broad selection of competitive, best-in-class payment processing solutions. This transaction will result in a one-time $14.0 million gain which will be recognized in the third quarter of 2017."

Mr. Robbins continued, "I'm pleased to have recently announced some organization changes that are occurring at the Company. Clint Stein's transition from Chief Financial Officer to Chief Operating Officer provides a great opportunity for leadership continuity as the two of us and our teams, have worked closely on the majority of our recently completed and in process strategic business initiatives. In addition to the national search for our next CFO, we have a search underway for an executive level Chief Risk Officer. This role will oversee the maturation of our existing enterprise risk management program and position us for future growth."

Cash Dividend Announcement

Columbia will pay a regular cash dividend of $0.22 per common share on August 23, 2017 to shareholders of record as of the close of business on August 9, 2017.

Conference Call Information

Columbia's management will discuss the second quarter 2017 results on a conference call scheduled for Thursday, July 27, 2017 at 1:00 p.m. Pacific Time (4:00 p.m. ET). Interested parties join the live-streamed event and a replay of the event by using the site:

https://engage.vevent.com/rt/columbiabankingsystemincao~48444274

The conference call can also be accessed on Thursday, July 27, 2017 at 1:00 p.m. Pacific Time (4:00 p.m. ET) by calling 1-888-286-8956; Conference ID code #48444274.

About Columbia

Headquartered in Tacoma, Washington, Columbia Banking System, Inc. is the holding company of Columbia Bank, a Washington state-chartered full-service commercial bank with locations throughout Washington, Oregon and Idaho. For the eleventh consecutive year, the bank was named in 2017 as one of Puget Sound Business Journal's "Washington's Best Workplaces." Columbia ranked in the top 30 on the 2017 Forbes list of best banks.

More information about Columbia can be found on its website at www.columbiabank.com.

Note Regarding Forward-Looking Statements

This news release includes forward looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward looking statements include, but are not limited to, descriptions of Columbia's management's expectations regarding future events and developments such as future operating results, growth in loans and deposits, continued success of Columbia's style of banking and the strength of the local economy. The words "will," "believe," "expect," "intend," "should," and "anticipate" or the negative of these words or words of similar construction are intended in part to help identify forward looking statements. Future events are difficult to predict, and the expectations described above are necessarily subject to risks and uncertainties, many of which are outside our control, that may cause actual results to differ materially and adversely. In addition to discussions about risks and uncertainties set forth from time to time in Columbia's filings with the Securities and Exchange Commission, available at the SEC's website at www.sec.gov and the Company's website at www.columbiabank.com, including the "Risk Factors," "Business" and "Management's Discussion and Analysis of Financial Condition and Results of Operations" sections of our annual reports on Form 10-K and quarterly reports on Form 10-Q, (as applicable), factors that may cause actual results to differ materially from those contemplated by such forward-looking statements include, among others, the following: (1) local, national and international economic conditions may be less favorable than expected or have a more direct and pronounced effect on Columbia than expected and adversely affect Columbia's ability to continue its internal growth at historical rates and maintain the quality of its earning assets; (2) changes in interest rates could significantly reduce net interest income and negatively affect funding sources; (3) projected business increases following strategic expansion or opening or acquiring new branches may be lower than expected; (4) costs or difficulties related to the integration of acquisitions may be greater than expected; (5) competitive pressure among financial institutions may increase significantly; (6) legislation or regulatory requirements or changes may adversely affect the businesses in which Columbia is engaged; and (7) the proposed merger with Pacific Continental Corporation ("Pacific Continental") may not close when expected or at all because required regulatory or other approvals and other conditions to closing are not received or satisfied on a timely basis or at all, which may have an effect on the trading prices of Columbia's stock. We believe the expectations reflected in our forward-looking statements are reasonable, based on information available to us on the date hereof. However, given the described uncertainties and risks, we cannot guarantee our future performance or results of operations and you should not place undue reliance on these forward-looking statements which speak only as of the date hereof. We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise, except as required by the federal securities laws. The factors noted above and the risks and uncertainties described in our SEC filings should be considered when reading any forward-looking statements in this release.

Additional Information

In connection with the Agreement and Plan of Merger, dated as of January 9, 2017, by and between Columbia Banking System, Inc. and Pacific Continental, Columbia has filed with the SEC a Registration Statement on Form S-4 that includes a Joint Proxy Statement of Columbia and Pacific Continental and a Prospectus of Columbia, as well as other relevant documents concerning the proposed transaction. Shareholders of Columbia and Pacific Continental are urged to carefully read the Registration Statement and the Joint Proxy Statement/Prospectus regarding the transaction in their entirety and any other relevant documents filed with the SEC, as well as any amendments or supplements to those documents, because they contain important information. Shareholders of Columbia and Pacific Continental are also urged to carefully review and consider each of Columbia's and Pacific Continental's public filings with the SEC, including but not limited to their Annual Reports on Form 10-K, their proxy statements, their Current Reports on Form 8-K and their Quarterly Reports on Form 10-Q. A definitive Joint Proxy Statement/Prospectus has been sent to the shareholders of each institution seeking any required shareholder approvals. The Joint Proxy Statement/Prospectus and other relevant materials filed with the SEC may be obtained free of charge at the SEC's Website at http://www.sec.gov. PACIFIC CONTINENTAL AND COLUMBIA SHAREHOLDERS ARE URGED TO READ THE JOINT PROXY STATEMENT/PROSPECTUS AND THE OTHER RELEVANT MATERIALS BECAUSE THEY CONTAIN IMPORTANT INFORMATION ABOUT THE TRANSACTION.

Investors will also be able to obtain these documents, free of charge, from Pacific Continental by accessing Pacific Continental's website at www.therightbank.com under the link "Investor Relations" or from Columbia at www.columbiabank.com under the tab "About" and then under the heading "Investor Relations." Copies can also be obtained, free of charge, by directing a written request to Columbia, Attention: Corporate Secretary, 1301 A Street, Suite 800, Tacoma, Washington 98401-2156 or to Pacific Continental, Attention: Corporate Secretary, 111 West Seventh Avenue, P.O. Box 10727, Eugene Oregon 97440-2727.



    Contacts:                    Hadley S. Robbins,

                                 President and

                                 Chief Executive Officer


                                 Clint E. Stein,

                                  Executive Vice President
                                  and

                                 Chief Financial Officer


                                 Investor Relations

                                 (253) 305-1921

    FINANCIAL STATISTICS

    Columbia Banking System, Inc.                                                        Three Months Ended                                                   Six Months Ended

    Unaudited                                                     June 30,             March 31,                     June 30,                    June 30,              June 30,

                                                                       2017                   2017                           2016                        2017                   2016
                                                                       ----                   ----                           ----                        ----                   ----

    Earnings                                                                                        (dollars in thousands except per share amounts)
    --------

    Net interest income                                                        $86,161                                                 $86,675                                          $82,140              $172,836   $162,310

    Provision for loan and lease losses                                         $3,177                                                  $2,775                                           $3,640                $5,952     $8,894

    Noninterest income                                                         $24,135                                                 $24,859                                          $21,940               $48,994    $42,586

    Noninterest expense                                                        $68,867                                                 $68,986                                          $63,790              $137,853   $128,864

    Acquisition-related expense (included in noninterest expense)               $1,023                                                  $1,364                                   $            -               $2,387     $2,436

    Net income                                                                 $27,132                                                 $29,199                                          $25,405               $56,331    $46,664

    Per Common Share
    ----------------

    Earnings (basic)                                                             $0.47                                                   $0.50                                            $0.44                 $0.97      $0.80

    Earnings (diluted)                                                           $0.47                                                   $0.50                                            $0.44                 $0.97      $0.80

    Book value                                                                  $22.23                                                  $21.86                                           $21.93                $22.23     $21.93

    Averages
    --------

    Total assets                                                            $9,597,274                                              $9,473,698                                       $9,230,791            $9,535,827 $9,090,001

    Interest-earning assets                                                 $8,651,735                                              $8,520,291                                       $8,285,183            $8,586,376 $8,145,564

    Loans                                                                   $6,325,462                                              $6,198,215                                       $5,999,428            $6,262,190 $5,913,434

    Securities, including Federal Home Loan Bank stock                      $2,316,077                                              $2,310,490                                       $2,262,012            $2,313,299 $2,204,734

    Deposits                                                                $7,965,868                                              $7,954,653                                       $7,622,266            $7,960,292 $7,533,980

    Interest-bearing deposits                                               $4,123,135                                              $4,118,604                                       $4,026,384            $4,120,882 $4,004,849

    Interest-bearing liabilities                                            $4,367,216                                              $4,263,660                                       $4,264,792            $4,315,724 $4,194,687

    Noninterest-bearing deposits                                            $3,842,733                                              $3,836,049                                       $3,595,882            $3,839,410 $3,529,131

    Shareholders' equity                                                    $1,295,564                                              $1,261,652                                       $1,267,670            $1,278,702 $1,263,040

    Financial Ratios
    ----------------

    Return on average assets                                          1.13%                                1.23%                                     1.10%                              1.18%        1.03%

    Return on average common equity                                   8.38%                                9.26%                                     8.02%                              8.81%        7.39%

    Average equity to average assets                                 13.50%                               13.32%                                    13.73%                             13.41%       13.89%

    Net interest margin (tax equivalent)                              4.12%                                4.20%                                     4.10%                              4.16%        4.12%

    Efficiency ratio (tax equivalent) (1)                            60.42%                               59.95%                                    59.30%                             60.19%       60.93%

    Operating efficiency ratio (tax equivalent) (2)                  57.23%                               59.07%                                    58.81%                             58.15%       59.12%


                                                                  June 30,             March 31,                   December 31,

    Period end                                                         2017                   2017                           2016
    ----------                                                         ----                   ----                           ----

    Total assets                                                            $9,685,110                                              $9,527,272                                       $9,509,607

    Loans, net of unearned income                                           $6,423,074                                              $6,228,136                                       $6,213,423

    Allowance for loan and lease losses                                        $72,984                                                 $71,021                                          $70,043

    Securities, including Federal Home Loan Bank stock                      $2,280,996                                              $2,341,959                                       $2,288,817

    Deposits                                                                $8,072,464                                              $8,088,827                                       $8,059,415

    Core deposits                                                           $7,721,766                                              $7,794,590                                       $7,749,568

    Shareholders' equity                                                    $1,297,314                                              $1,275,343                                       $1,251,012

    Nonperforming assets
    --------------------

    Nonaccrual loans                                                           $36,824                                                 $25,547                                          $27,756

    Other real estate owned ("OREO") and other personal property
     owned ("OPPO")                                                   4,058                                 4,519                                      5,998

    Total nonperforming assets                                                 $40,882                                                 $30,066                                          $33,754
                                                                               =======                                                 =======                                          =======

    Nonperforming loans to period-end loans                           0.57%                                0.41%                                     0.45%

    Nonperforming assets to period-end assets                         0.42%                                0.32%                                     0.35%

    Allowance for loan and lease losses to period-end loans           1.14%                                1.14%                                     1.13%

    Net loan charge-offs                                                        $1,214                        (3)                       $1,797                    (4)                      $239 (5)


    (1) Noninterest expense divided by the sum of net interest income on a tax equivalent basis and noninterest income on a tax equivalent basis.

    (2) The operating efficiency ratio (tax equivalent) is a non-GAAP financial measure. See section titled "Non-GAAP Financial Measures" on the last page of this earnings release for the reconciliation of the operating efficiency ratio (tax equivalent) to the efficiency ratio (tax equivalent).

    (3) For the three months ended June 30, 2017.

    (4) For the three months ended March 31, 2017.

    (5) For the three months ended December 31, 2016..



    QUARTERLY FINANCIAL
     STATISTICS

    Columbia Banking System,
     Inc.                                                                   Three Months Ended

    Unaudited                    June 30,             March 31,              December 31,               September 30,    June 30,

                                      2017                   2017                      2016                         2016          2016
                                      ----                   ----                      ----                         ----          ----

                                                               (dollars in thousands except per share)

    Earnings
    --------

    Net interest income                       $86,161                                           $86,675                                   $85,737                $85,572      $82,140

    Provision for loan and lease
     losses                                    $3,177                                            $2,775                                       $18                 $1,866       $3,640

    Noninterest income                        $24,135                                           $24,859                                   $22,330                $23,166      $21,940

    Noninterest expense                       $68,867                                           $68,986                                   $65,014                $67,264      $63,790

    Acquisition-related expense
     (included in noninterest
     expense)                                  $1,023                                            $1,364                                      $291          $           - $         -

    Net income                                $27,132                                           $29,199                                   $30,718                $27,484      $25,405

    Per Common Share
    ----------------

    Earnings (basic)                            $0.47                                             $0.50                                     $0.53                  $0.47        $0.44

    Earnings (diluted)                          $0.47                                             $0.50                                     $0.53                  $0.47        $0.44

    Book value                                 $22.23                                            $21.86                                    $21.52                 $21.96       $21.93

    Averages
    --------

    Total assets                           $9,597,274                                        $9,473,698                                $9,568,214             $9,493,451   $9,230,791

    Interest-earning assets                $8,651,735                                        $8,520,291                                $8,612,498             $8,544,876   $8,285,183

    Loans                                  $6,325,462                                        $6,198,215                                $6,200,506             $6,179,163   $5,999,428

    Securities, including
     Federal Home Loan Bank
     stock                                 $2,316,077                                        $2,310,490                                $2,314,521             $2,351,093   $2,262,012

    Deposits                               $7,965,868                                        $7,954,653                                $8,105,522             $7,918,532   $7,622,266

    Interest-bearing deposits              $4,123,135                                        $4,118,604                                $4,151,695             $4,118,787   $4,026,384

    Interest-bearing liabilities           $4,367,216                                        $4,263,660                                $4,222,820             $4,295,485   $4,264,792

    Noninterest-bearing deposits           $3,842,733                                        $3,836,049                                $3,953,827             $3,799,745   $3,595,882

    Shareholders' equity                   $1,295,564                                        $1,261,652                                $1,274,388             $1,278,588   $1,267,670

    Financial Ratios
    ----------------

    Return on average assets         1.13%                           1.23%                                      1.28%                     1.16%     1.10%

    Return on average common
     equity                          8.38%                           9.26%                                      9.65%                     8.60%     8.02%

    Average equity to average
     assets                         13.50%                          13.32%                                     13.32%                    13.47%    13.73%

    Net interest margin (tax
     equivalent)                     4.12%                           4.20%                                      4.11%                     4.13%     4.10%

    Period end
    ----------

    Total assets                           $9,685,110                                        $9,527,272                                $9,509,607             $9,586,754   $9,353,651

    Loans, net of unearned
     income                                $6,423,074                                        $6,228,136                                $6,213,423             $6,259,757   $6,107,143

    Allowance for loan and lease
     losses                                   $72,984                                           $71,021                                   $70,043                $70,264      $69,304

    Securities, including
     Federal Home Loan Bank
     stock                                 $2,280,996                                        $2,341,959                                $2,288,817             $2,372,724   $2,297,713

    Deposits                               $8,072,464                                        $8,088,827                                $8,059,415             $8,057,816   $7,673,213

    Core deposits                          $7,721,766                                        $7,794,590                                $7,749,568             $7,809,064   $7,447,963

    Shareholders' equity                   $1,297,314                                        $1,275,343                                $1,251,012             $1,276,735   $1,274,479

    Nonperforming assets
    --------------------

    Nonaccrual loans                          $36,824                                           $25,547                                   $27,756                $21,366      $22,915

    OREO and OPPO                    4,058                            4,519                                       5,998                      8,994     10,613
                                     -----                            -----                                       -----                      -----     ------

    Total nonperforming assets                $40,882                                           $30,066                                   $33,754                $30,360      $33,528
                                              -------                                           -------                                   -------                -------      -------

    Nonperforming loans to
     period-end loans                0.57%                           0.41%                                      0.45%                     0.34%     0.38%

    Nonperforming assets to
     period-end assets               0.42%                           0.32%                                      0.35%                     0.32%     0.36%

    Allowance for loan and lease
     losses to period-end loans      1.14%                           1.14%                                      1.13%                     1.12%     1.13%

    Net loan charge-offs                       $1,214                                            $1,797                                      $239                   $906       $3,600



    LOAN PORTFOLIO COMPOSITION

    Columbia Banking System,
     Inc.

    Unaudited                  June 30,             March 31,                      December 31,            September 30, June 30,

                                    2017                     2017                         2016                      2016       2016
                                    ----                     ----                         ----                      ----       ----

    Loan Portfolio Composition
     -Dollars                                                   (dollars in thousands)
    --------------------------

    Commercial business                  $2,704,468                                  $2,559,247                          $2,551,054               $2,630,017 $2,518,682

    Real estate:

    One-to-four family
     residential                 173,150                    172,581                                170,331                   168,511      172,957

    Commercial and multifamily
     residential               2,787,560                  2,783,433                              2,719,830                 2,686,783    2,651,476
                               ---------                  ---------                              ---------                 ---------    ---------

    Total real estate          2,960,710                  2,956,014                              2,890,161                 2,855,294    2,824,433

    Real estate construction:

    One-to-four family
     residential                 139,956                    115,219                                121,887                   130,163      129,195

    Commercial and multifamily
     residential                 195,565                    172,896                                209,118                   202,014      185,315
                                 -------                    -------                                -------                   -------      -------

    Total real estate
     construction                335,521                    288,115                                331,005                   332,177      314,510

    Consumer                     323,187                    318,069                                329,261                   325,741      325,632

    Purchased credit impaired    129,853                    138,903                                145,660                   152,764      161,107
                                 -------                    -------                                -------                   -------      -------

    Subtotal loans             6,453,739                  6,260,348                              6,247,141                 6,295,993    6,144,364

    Less:  Net unearned income  (30,665)                  (32,212)                              (33,718)                 (36,236)    (37,221)
                                 -------                    -------                                -------                   -------      -------

    Loans, net of unearned
     income                    6,423,074                  6,228,136                              6,213,423                 6,259,757    6,107,143

    Less:  Allowance for loan
     and lease losses           (72,984)                  (71,021)                              (70,043)                 (70,264)    (69,304)

    Total loans, net           6,350,090                  6,157,115                              6,143,380                 6,189,493    6,037,839
                               =========                  =========                              =========                 =========    =========

    Loans held for sale                      $6,918                                      $3,245                              $5,846                   $3,361     $7,649
                                             ======                                      ======                              ======                   ======     ======



                             June 30, March 31,            December 31,   September 30,    June 30,

    Loan Portfolio
     Composition -
     Percentages                 2017         2017                   2016             2016          2016
    --------------               ----         ----                   ----             ----          ----

    Commercial business         42.1%               41.1%                         41.1%                   42.0%     41.2%

    Real estate:

    One-to-four family
     residential                 2.7%                2.8%                          2.7%                    2.7%      2.8%

    Commercial and
     multifamily residential    43.5%               44.7%                         43.7%                   43.0%     43.6%
                                 ----                 ----                           ----                     ----       ----

    Total real estate           46.2%               47.5%                         46.4%                   45.7%     46.4%

    Real estate
     construction:

    One-to-four family
     residential                 2.2%                1.8%                          2.0%                    2.1%      2.1%

    Commercial and
     multifamily residential     3.0%                2.8%                          3.4%                    3.2%      3.0%
                                  ---                  ---                            ---                      ---        ---

    Total real estate
     construction                5.2%                4.6%                          5.4%                    5.3%      5.1%

    Consumer                     5.0%                5.1%                          5.3%                    5.2%      5.3%

    Purchased credit
     impaired                    2.0%                2.2%                          2.3%                    2.4%      2.6%
                                  ---                  ---                            ---                      ---        ---

    Subtotal loans             100.5%              100.5%                        100.5%                  100.6%    100.6%

    Less:  Net unearned
     income                    (0.5)%              (0.5)%                        (0.5)%                  (0.6)%    (0.6)%

    Loans, net of unearned
     income                    100.0%              100.0%                        100.0%                  100.0%    100.0%
                                =====                =====                          =====                    =====      =====

    DEPOSIT COMPOSITION

    Columbia Banking System,
     Inc.

    Unaudited

                             June 30,             March 31,                   December 31,             September 30,               June 30,

                                  2017                     2017                        2016                       2016                   2016
                                  ----                     ----                        ----                       ----                   ----

    Deposit Composition -
     Dollars                                                   (dollars in thousands)
    ---------------------

    Core deposits:

    Demand and other non-
     interest bearing                  $3,905,652                                 $3,958,106                           $3,944,495                       $3,942,434 $3,652,951

    Interest bearing demand    988,532                    985,954                              985,293                     963,242              957,548

    Money market             1,787,101                  1,798,034                            1,791,283                   1,873,376            1,818,337

    Savings                    756,825                    759,002                              723,667                     714,047              692,694

    Certificates of deposit,
     less than $250,000        283,656                    293,494                              304,830                     315,965              326,433
                               -------                    -------                              -------                     -------              -------

    Total core deposits      7,721,766                  7,794,590                            7,749,568                   7,809,064            7,447,963


    Certificates of deposit,
     $250,000 or more           81,861                     74,460                               79,424                      79,590               72,812

    Certificates of deposit
     insured by CDARS(R)        19,276                     20,994                               22,039                      16,951               22,755

    Brokered money market
     accounts                  249,554                    198,768                              208,348                     152,151              129,590
                               -------                    -------                              -------                     -------              -------

    Subtotal                 8,072,457                  8,088,812                            8,059,379                   8,057,756            7,673,120

    Premium resulting from
     acquisition date fair
     value adjustment                7                         15                                   36                          60                   93
                                   ---                        ---                                  ---                         ---                  ---

    Total deposits                     $8,072,464                                 $8,088,827                           $8,059,415                       $8,057,816 $7,673,213
                                       ==========                                 ==========                           ==========                       ========== ==========



                          June 30, March 31,          December 31,   September 30,    June 30,

    Deposit Composition -
     Percentages              2017       2017                   2016             2016         2016
    ---------------------     ----       ----                   ----             ----         ----

    Core deposits:

    Demand and other non-
     interest bearing        48.4%             48.9%                         48.9%                  48.9%     47.6%

    Interest bearing
     demand                  12.2%             12.2%                         12.2%                  12.0%     12.5%

    Money market             22.1%             22.2%                         22.2%                  23.2%     23.7%

    Savings                   9.4%              9.4%                          9.0%                   8.9%      9.0%

    Certificates of
     deposit, less than
     $250,000                 3.5%              3.6%                          3.8%                   3.9%      4.3%
                               ---                ---                            ---                     ---        ---

    Total core deposits      95.6%             96.3%                         96.1%                  96.9%     97.1%


    Certificates of
     deposit, $250,000 or
     more                     1.0%              0.9%                          1.0%                   1.0%      0.9%

    Certificates of
     deposit insured by
     CDARS(R)                 0.2%              0.3%                          0.3%                   0.2%      0.3%

    Brokered money market
     accounts                 3.2%              2.5%                          2.6%                   1.9%      1.7%

    Total                   100.0%            100.0%                        100.0%                 100.0%    100.0%
                             =====              =====                          =====                   =====      =====



    CONSOLIDATED STATEMENTS OF
     INCOME

    Columbia Banking System, Inc.                   Three Months Ended                                          Six Months Ended

    Unaudited                     June 30,          March 31,                June 30,              June 30,       June 30,

                                       2017               2017                      2016                   2017            2016
                                       ----               ----                      ----                   ----            ----

                                                               (in thousands except per share)

    Interest Income

    Loans                                   $75,579                                        $74,120                               $71,651              $149,699 $141,967

    Taxable securities                9,468                         10,986                               8,829                     20,454      16,846

    Tax-exempt securities             2,716                          2,691                               2,795                      5,407       5,598

    Deposits in banks                    23                             19                                  28                         42          66
                                        ---                            ---                                 ---                        ---         ---

    Total interest income            87,786                         87,816                              83,303                    175,602     164,477

    Interest Expense

    Deposits                            908                            787                                 787                      1,695       1,529

    Federal Home Loan Bank
     advances                           591                            225                                 241                        816         365

    Other borrowings                    126                            129                                 135                        255         273
                                        ---                            ---                                 ---                        ---         ---

    Total interest expense            1,625                          1,141                               1,163                      2,766       2,167
                                      -----                          -----                               -----                      -----       -----

    Net Interest Income              86,161                         86,675                              82,140                    172,836     162,310

    Provision for loan and lease
     losses                           3,177                          2,775                               3,640                      5,952       8,894
                                      -----                          -----                               -----                      -----       -----

    Net interest income after
     provision for loan and lease
     losses                          82,984                         83,900                              78,500                    166,884     153,416

    Noninterest Income

    Deposit account and treasury
     management fees                  7,396                          7,287                               7,093                     14,683      14,082

    Card revenue                      6,202                          5,723                               6,051                     11,925      11,703

    Financial services and trust
     revenue                          3,036                          2,839                               2,780                      5,875       5,601

    Loan revenue                      2,989                          3,593                               2,802                      6,582       5,064

    Merchant processing revenue       2,264                          2,019                               2,272                      4,283       4,374

    Bank owned life insurance         1,433                          1,280                               1,270                      2,713       2,386

    Investment securities gains,
     net                                  -                             -                                229                          -        602

    Change in FDIC loss-sharing
     asset                            (173)                         (274)                              (990)                     (447)    (2,093)

    Other                               988                          2,392                                 433                      3,380         867
                                        ---                          -----                                 ---                      -----         ---

    Total noninterest income         24,135                         24,859                              21,940                     48,994      42,586

    Noninterest Expense

    Compensation and employee
     benefits                        38,393                         40,825                              37,291                     79,218      73,610

    Occupancy                         7,577                          7,191                               7,652                     14,768      17,825

    Merchant processing expense       1,147                          1,049                               1,118                      2,196       2,151

    Advertising and promotion         1,137                            817                               1,043                      1,954       1,885

    Data processing                   4,741                          4,208                               3,929                      8,949       8,075

    Legal and professional fees       2,947                          3,369                               1,777                      6,316       3,102

    Taxes, licenses and fees            748                          1,241                               1,298                      1,989       2,588

    Regulatory premiums                 741                            776                               1,068                      1,517       2,209

    Net cost (benefit) of
     operation of other real
     estate owned                       (1)                           152                                  84                        151         188

    Amortization of intangibles       1,249                          1,349                               1,483                      2,598       3,066

    Other                            10,188                          8,009                               7,047                     18,197      14,165
                                     ------                          -----                               -----                     ------      ------

    Total noninterest expense        68,867                         68,986                              63,790                    137,853     128,864
                                     ------                         ------                              ------                    -------     -------

    Income before income taxes       38,252                         39,773                              36,650                     78,025      67,138

    Provision for income taxes       11,120                         10,574                              11,245                     21,694      20,474
                                     ------                         ------                              ------                     ------      ------

    Net Income                              $27,132                                        $29,199                               $25,405               $56,331  $46,664
                                            =======                                        =======                               =======               =======  =======

    Earnings per common share

    Basic                                     $0.47                                          $0.50                                 $0.44                 $0.97    $0.80

    Diluted                                   $0.47                                          $0.50                                 $0.44                 $0.97    $0.80

    Dividends paid per common
     share -regular                           $0.22                                          $0.22                                 $0.19                 $0.44    $0.37

    Dividends paid per common
     share -special                       $       -                                  $          -                                $0.18           $         -   $0.38
                                        ---     ---                                ---        ---                                -----         ---       ---   -----

    Dividends paid per common
     share -total                             $0.22                                          $0.22                                 $0.37                 $0.44    $0.75

    Weighted average number of
     common shares outstanding       57,520                         57,388                              57,185                     57,437      57,149

    Weighted average number of
     diluted common shares
     outstanding                     57,525                         57,394                              57,195                     57,442      57,160


    CONSOLIDATED BALANCE SHEETS

    Columbia Banking System, Inc.

    Unaudited                                                                                                                                                                                     June 30,                March 31,               December 31,

                                                                                                                                                                                                        2017                     2017                        2016
                                                                                                                                                                                                        ----                     ----                        ----

                                                                                                                                                                                                                              (in thousands)

                                                                                                                           ASSETS

    Cash and due from banks                                                                                                                                                                                    $197,623                                              $169,697                                $193,038

    Interest-earning deposits with banks                                                                                                                                                              14,425                               13,124                                31,200
                                                                                                                                                                                                      ------                               ------                                ------

    Total cash and cash equivalents                                                                                                                                                                  212,048                              182,821                               224,238

    Securities available for sale at fair value (amortized cost of $2,272,959, $2,349,149 and $2,299,037, respectively)                               2,264,636                        2,331,359                             2,278,577

    Federal Home Loan Bank stock at cost                                                                                                                 16,360                           10,600                                10,240

    Loans held for sale                                                                                                                                                                                6,918                                3,245                                 5,846

    Loans, net of unearned income of ($30,665), ($32,212) and ($33,718), respectively                                                                 6,423,074                        6,228,136                             6,213,423

    Less: allowance for loan and lease losses                                                                                                                                                                             72,984                                   71,021                       70,043
                                                                                                                                                                                                                          ------                                   ------                       ------

    Loans, net                                                                                                                                                                                     6,350,090                            6,157,115                             6,143,380

    FDIC loss-sharing asset                                                                                                                                                                                -                               3,239                                 3,535

    Interest receivable                                                                                                                                                                               30,856                               31,345                                30,074

    Premises and equipment, net                                                                                                                                                                      146,728                              148,541                               150,342

    Other real estate owned                                                                                                                                                                            4,058                                4,519                                 5,998

    Goodwill                                                                                                                                                                                         382,762                              382,762                               382,762

    Other intangible assets, net                                                                                                                                                                      15,033                               16,282                                17,631

    Other assets                                                                                                                                                                                     255,621                              255,444                               256,984

    Total assets                                                                                                                                                                                             $9,685,110                                            $9,527,272                              $9,509,607
                                                                                                                                                                                                             ==========                                            ==========                              ==========

                                                                                                            LIABILITIES AND SHAREHOLDERS' EQUITY

    Deposits:

    Noninterest-bearing                                                                                                                                                                                      $3,905,652                                            $3,958,106                              $3,944,495

    Interest-bearing                                                                                                                                                                               4,166,812                            4,130,721                             4,114,920
                                                                                                                                                                                                   ---------                            ---------                             ---------

    Total deposits                                                                                                                                                                                 8,072,464                            8,088,827                             8,059,415

    Federal Home Loan Bank advances                                                                                                                                                                  159,474                               15,483                                 6,493

    Securities sold under agreements to repurchase                                                                                                       65,895                           46,914                                80,822

    Other liabilities                                                                                                                                                                                 89,963                              100,705                               111,865
                                                                                                                                                                                                      ------                              -------                               -------

    Total liabilities                                                                                                                                                                              8,387,796                            8,251,929                             8,258,595

    Commitments and contingent liabilities

                                                                                                                                   June 30,                     March 31,          December 31,

                                                                                                                                               2017                   2017                   2016
                                                                                                                                               ----                   ----                   ----

    Preferred stock (no par value)                                                                                                        (in thousands)

    Authorized shares                                                                                                                         2,000                          2,000                                  2,000

    Issued and outstanding                                                                                                                        -                             -                                     9                                        -                           -                          2,217

    Common stock (no par value)

    Authorized shares                                                                                                                       115,000                        115,000                                115,000

    Issued and outstanding                                                                                                                   58,353                         58,329                                 58,042                                1,001,292                      999,702                         995,837

    Retained earnings                                                                                                                                                                                302,550                              288,247                               271,957

    Accumulated other comprehensive loss                                                                                                                                                                                 (6,528)                                (12,606)                    (18,999)
                                                                                                                                                                                                                          ------                                  -------                      -------

    Total shareholders' equity                                                                                                                                                                     1,297,314                            1,275,343                             1,251,012

    Total liabilities and shareholders' equity                                                                                                                                                    $9,685,110                                          $9,527,272                                $9,509,607
                                                                                                                                                                                                  ==========                                          ==========                                ==========



    AVERAGE BALANCES AND RATES

    Columbia Banking System, Inc.

    Unaudited

                                                        Three Months Ended                                        Three Months Ended
                                                        ------------------                                        ------------------

                                                           June 30, 2017                                            June 30, 2016

                                          Average                  Interest           Average                  Average                   Interest                Average
                                         Balances               Earned / Paid           Rate                  Balances                Earned / Paid                Rate
                                         --------               -------------           ----                  --------                -------------                ----

                                                                              (dollars in thousands)

    ASSETS

    Loans, net (1)(2)                              $6,325,462                                      $77,030                        4.87%                                  $5,999,428                        $72,952         4.86%

    Taxable securities                   1,861,895                            9,468                            2.03%                          1,801,195                        8,829                 1.96%

    Tax exempt securities (2)              454,182                            4,179                            3.68%                            460,817                        4,300                 3.73%

    Interest-earning deposits
     with banks                             10,196                               23                            0.90%                             23,743                           28                 0.47%
                                            ------                              ---                                                              ------                          ---

    Total interest-earning
     assets                              8,651,735                                      $90,700                          4.19%                          8,285,183                            $86,109               4.16%

    Other earning assets                   173,044                                                                           154,843

    Noninterest-earning assets             772,495                                                                           790,765
                                           -------                                                                           -------

    Total assets                                   $9,597,274                                                                               $9,230,791
                                                   ==========                                                                               ==========

    LIABILITIES AND SHAREHOLDERS' EQUITY

    Certificates of deposit                          $386,361                                          $95                        0.10%                                    $428,279                           $140         0.13%

    Savings accounts                       755,253                               19                            0.01%                            692,179                           18                 0.01%

    Interest-bearing demand                983,936                              192                            0.08%                            949,669                          183                 0.08%

    Money market accounts                1,997,585                              602                            0.12%                          1,956,257                          446                 0.09%
                                         ---------                              ---                                                           ---------                          ---

    Total interest-bearing
     deposits                            4,123,135                              908                            0.09%                          4,026,384                          787                 0.08%

    Federal Home Loan Bank
     advances                              195,369                              591                            1.21%                            161,637                          241                 0.60%

    Other borrowings                        48,712                              126                            1.03%                             76,771                          135                 0.70%
                                            ------                              ---                                                              ------                          ---

    Total interest-bearing
     liabilities                         4,367,216                                       $1,625                          0.15%                          4,264,792                             $1,163               0.11%

    Noninterest-bearing
     deposits                            3,842,733                                                                         3,595,882

    Other noninterest-bearing
     liabilities                            91,761                                                                           102,447

    Shareholders' equity                 1,295,564                                                                         1,267,670
                                         ---------                                                                         ---------

    Total liabilities &
     shareholders' equity                          $9,597,274                                                                               $9,230,791
                                                   ==========                                                                               ==========

    Net interest income (tax equivalent)                                                              $89,075                                                                        $84,946
                                                                                                      =======                                                                        =======

    Net interest margin (tax equivalent)                                                                                                                  4.12%                                                     4.10%
                                                                                                                                                           ====                                                       ====


    (1)              Nonaccrual loans have been
                     included in the tables as loans
                     carrying a zero yield.
                     Amortized net deferred loan
                     fees and net unearned discounts
                     on acquired loans were included
                     in the interest income
                     calculations. The amortization
                     of net deferred loan fees was
                     $1.8 million and $1.2 million
                     for the three month periods
                     ended June 30, 2017 and June
                     30, 2016, respectively. The
                     incremental accretion on
                     acquired loans was $3.1 million
                     and $4.4 million for the three
                     months ended June 30, 2017 and
                     2016, respectively.

    (2)              Tax-exempt income is calculated
                     on a tax equivalent basis. The
                     tax equivalent yield adjustment
                     to interest earned on loans was
                     $1.5 million and $1.3 million
                     for the three months ended June
                     30, 2017 and 2016,
                     respectively. The tax
                     equivalent yield adjustment to
                     interest earned on tax exempt
                     securities was $1.5 million for
                     the three months ended June 30,
                     2017 and 2016, respectively.



    AVERAGE BALANCES AND RATES

    Columbia Banking System, Inc.

    Unaudited

                                                        Three Months Ended                                        Three Months Ended
                                                        ------------------                                        ------------------

                                                           June 30, 2017                                            March 31, 2017

                                          Average                  Interest           Average                  Average                   Interest                Average
                                         Balances               Earned / Paid           Rate                  Balances                Earned / Paid                Rate
                                         --------               -------------           ----                  --------                -------------                ----

                                                                              (dollars in thousands)

    ASSETS

    Loans, net (1)(2)                              $6,325,462                                      $77,030                        4.87%                                  $6,198,215                        $75,514         4.87%

    Taxable securities                   1,861,895                            9,468                            2.03%                          1,861,627                       10,986                 2.36%

    Tax exempt securities (2)              454,182                            4,179                            3.68%                            448,863                        4,140                 3.69%

    Interest-earning deposits
     with banks                             10,196                               23                            0.90%                             11,586                           19                 0.66%
                                            ------                              ---                                                              ------                          ---

    Total interest-earning
     assets                              8,651,735                                      $90,700                          4.19%                          8,520,291                            $90,659               4.26%

    Other earning assets                   173,044                                                                           178,091

    Noninterest-earning assets             772,495                                                                           775,316
                                           -------                                                                           -------

    Total assets                                   $9,597,274                                                                               $9,473,698
                                                   ==========                                                                               ==========

    LIABILITIES AND SHAREHOLDERS' EQUITY

    Certificates of deposit                          $386,361                                          $95                        0.10%                                    $399,306                            $95         0.10%

    Savings accounts                       755,253                               19                            0.01%                            738,631                           19                 0.01%

    Interest-bearing demand                983,936                              192                            0.08%                            972,560                          159                 0.07%

    Money market accounts                1,997,585                              602                            0.12%                          2,008,107                          514                 0.10%
                                         ---------                              ---                                                           ---------                          ---

    Total interest-bearing
     deposits                            4,123,135                              908                            0.09%                          4,118,604                          787                 0.08%

    Federal Home Loan Bank
     advances                              195,369                              591                            1.21%                             81,577                          225                 1.10%

    Other borrowings                        48,712                              126                            1.03%                             63,479                          129                 0.81%
                                            ------                              ---                                                              ------                          ---

    Total interest-bearing
     liabilities                         4,367,216                                       $1,625                          0.15%                          4,263,660                             $1,141               0.11%

    Noninterest-bearing
     deposits                            3,842,733                                                                         3,836,049

    Other noninterest-bearing
     liabilities                            91,761                                                                           112,337

    Shareholders' equity                 1,295,564                                                                         1,261,652
                                         ---------                                                                         ---------

    Total liabilities &
     shareholders' equity                          $9,597,274                                                                               $9,473,698
                                                   ==========                                                                               ==========

    Net interest income (tax equivalent)                                                              $89,075                                                                        $89,518
                                                                                                      =======                                                                        =======

    Net interest margin (tax equivalent)                                                                                                                  4.12%                                                     4.20%
                                                                                                                                                           ====                                                       ====


    (1)              Nonaccrual loans have been
                     included in the tables as loans
                     carrying a zero yield.
                     Amortized net deferred loan
                     fees and net unearned discounts
                     on acquired loans were included
                     in the interest income
                     calculations. The amortization
                     of net deferred loan fees was
                     $1.8 million and $1.6 million
                     for the three month periods
                     ended June 30, 2017 and March
                     31, 2017. The incremental
                     accretion on acquired loans was
                     $3.1 million and $4.1 million
                     for the three months ended June
                     30, 2017 and March 31, 2017,
                     respectively.

    (2)              Tax-exempt income is calculated
                     on a tax equivalent basis. The
                     tax equivalent yield adjustment
                     to interest earned on loans was
                     $1.5 million and $1.4 million
                     for the three months ended June
                     30, 2017 and March 31, 2017,
                     respectively. The tax
                     equivalent yield adjustment to
                     interest earned on tax exempt
                     securities was $1.5 million and
                     $1.4 million for the three
                     month periods ended June 30,
                     2017 and March 31, 2017,
                     respectively.



    AVERAGE BALANCES AND RATES

    Columbia Banking System, Inc.

    Unaudited

                                                     Six Months Ended June 30,                                          Six Months Ended June 30,
                                                     -------------------------                                          -------------------------

                                                                                    2017                                                                       2016

                                          Average                  Interest                    Average               Average                       Interest         Average
                                         Balances               Earned / Paid                    Rate                Balances                   Earned / Paid        Rate
                                         --------               -------------                    ----                --------                   -------------        ----

                                                                                 (dollars in thousands)

    ASSETS

    Loans, net (1)(2)                              $6,262,190                                     $152,544                       4.87%                                  $5,913,434                         $144,250       4.88%

    Taxable securities                   1,861,762                          20,454                             2.20%                      1,745,242                          16,846                  1.93%

    Tax exempt securities (2)              451,537                           8,319                             3.68%                        459,492                           8,612                  3.75%

    Interest-earning deposits
     with banks                             10,887                              42                             0.77%                         27,396                              66                  0.48%
                                            ------                             ---                                                           ------                             ---

    Total interest-earning
     assets                              8,586,376                                    $181,359                          4.22%                             8,145,564                         $169,774                4.17%

    Other earning assets                   175,554                                                                          154,589

    Noninterest-earning assets             773,897                                                                          789,848
                                           -------                                                                          -------

    Total assets                                   $9,535,827                                                                           $9,090,001
                                                   ==========                                                                           ==========

    LIABILITIES AND SHAREHOLDERS' EQUITY

    Certificates of deposit                          $392,798                                         $190                       0.10%                                    $438,597                             $284       0.13%

    Savings accounts                       746,988                              38                             0.01%                        684,027                              35                  0.01%

    Interest-bearing demand                978,279                             351                             0.07%                        938,809                             352                  0.07%

    Money market accounts                2,002,817                           1,116                             0.11%                      1,943,416                             858                  0.09%
                                         ---------                           -----                                                        ---------                             ---

    Total interest-bearing
     deposits                            4,120,882                           1,695                             0.08%                      4,004,849                           1,529                  0.08%

    Federal Home Loan Bank
     advances                              138,787                             816                             1.18%                        106,103                             365                  0.69%

    Other borrowings                        56,055                             255                             0.91%                         83,735                             273                  0.65%
                                            ------                             ---                                                           ------                             ---

    Total interest-bearing
     liabilities                         4,315,724                                      $2,766                          0.13%                             4,194,687                           $2,167                0.10%

    Noninterest-bearing
     deposits                            3,839,410                                                                        3,529,131

    Other noninterest-bearing
     liabilities                           101,991                                                                          103,143

    Shareholders' equity                 1,278,702                                                                        1,263,040
                                         ---------                                                                        ---------

    Total liabilities &
     shareholders' equity                          $9,535,827                                                                           $9,090,001
                                                   ==========                                                                           ==========

    Net interest income (tax equivalent)                                                              $178,593                                                                      $167,607
                                                                                                      ========                                                                      ========

    Net interest margin (tax equivalent)     4.16%                                                                    4.12%
                                              ====                                                                      ====


    (1)              Nonaccrual loans have been
                     included in the table as loans
                     carrying a zero yield.
                     Amortized net deferred loan
                     fees and net unearned discounts
                     on acquired loans were included
                     in the interest income
                     calculations. The amortization
                     of net deferred loan fees was
                     $3.4 million and $2.3 million
                     for the six months ended June
                     30, 2017 and 2016,
                     respectively. The incremental
                     accretion on acquired loans was
                     $7.2 million and $9.1 million
                     for the six months ended June
                     30, 2017 and 2016,
                     respectively.

    (2)              Tax-exempt income is calculated
                     on a tax equivalent basis. The
                     tax equivalent yield adjustment
                     to interest earned on loans was
                     $2.8 million and $2.3 million
                     for the six months ended June
                     30, 2017 and 2016,
                     respectively. The tax
                     equivalent yield adjustment to
                     interest earned on tax exempt
                     securities was $2.9 million and
                     $3.0 million for the six months
                     ended June 30, 2017 and 2016,
                     respectively.

Non-GAAP Financial Measures

The Company considers its operating net interest margin and operating efficiency ratios to be useful measurements as they more closely reflect the ongoing operating performance of the Company. Despite the usefulness of the operating net interest margin and operating efficiency ratio to the Company, there are no standardized definitions for them and, as a result, the Company's calculations may not be comparable with other organizations. The Company encourages readers to consider its consolidated financial statements in their entirety and not to rely on any single financial measure.

The following tables reconcile the Company's calculation of the operating net interest margin and operating efficiency ratio:



                                                                                                   Three Months Ended                                             Six Months Ended

                                                                             June 30,             March 31,                 June 30,                 June 30,     June 30,

                                                                                  2017                   2017                      2016                      2017          2016
                                                                                  ----                   ----                      ----                      ----          ----

    Operating net interest margin non-GAAP reconciliation:                                                               (dollars in thousands)

    Net interest income (tax equivalent) (1)                                              $89,075                                            $89,518                                $84,946                $178,593   $167,607
                                                                                          -------                                            -------                                -------                --------   --------

    Adjustments to arrive at operating net interest income (tax equivalent):

    Incremental accretion income on FDIC purchased credit impaired loans         (753)                           (2,117)                               (1,300)                    (2,870)    (2,957)

    Incremental accretion income on other acquired loans                       (2,356)                           (1,948)                               (3,074)                    (4,304)    (6,147)

    Premium amortization on acquired securities                                  1,669                              1,462                                  2,075                       3,131       4,399

    Interest reversals on nonaccrual loans                                         747                                265                                    107                       1,012         560

    Operating net interest income (tax equivalent) (1)                                    $88,382                                            $87,180                                $82,754                $175,562   $163,462
                                                                                          =======                                            =======                                =======                ========   ========

    Average interest earning assets                                                    $8,651,735                                         $8,520,291                             $8,285,183              $8,586,376 $8,145,564

    Net interest margin (tax equivalent) (1)                                     4.12%                             4.20%                                 4.10%                      4.16%      4.12%

    Operating net interest margin (tax equivalent) (1)                           4.09%                             4.09%                                 4.00%                      4.09%      4.01%



                                                                                                Three Months Ended                                           Six Months Ended

                                                                            June 30,           March 31,                 June 30,               June 30,            June 30,

                                                                                 2017                 2017                      2016                    2017                 2016
                                                                                 ----                 ----                      ----                    ----                 ----

    Operating efficiency ratio non-GAAP reconciliation:                                                              (dollars in thousands)

    Noninterest expense (numerator A)                                                  $68,867                                          $68,986                                     $63,790              $137,853 $128,864

    Adjustments to arrive at operating noninterest expense:

    Acquisition-related expenses                                              (1,023)                         (1,364)                                   -                         (2,387)    (2,436)

    Net benefit (cost) of operation of OREO and OPPO                                1                            (150)                                (84)                           (149)      (186)

    FDIC clawback liability recovery (expense)                                      -                              54                                 (70)                              54       (279)

    Loss on asset disposals                                                       (8)                             (6)                                 (7)                            (14)      (167)

    Termination of FDIC loss share agreements charge                          (2,409)                               -                                   -                         (2,409)          -

    State of Washington Business and Occupation ("B&O") taxes                   (642)                         (1,123)                             (1,204)                         (1,765)    (2,375)

    Operating noninterest expense (numerator B)                                        $64,786                                          $66,397                                     $62,425              $131,183 $123,421


    Net interest income (tax equivalent) (1)                                           $89,075                                          $89,518                                     $84,946              $178,593 $167,607

    Noninterest income                                                         24,135                           24,859                               21,940                           48,994      42,586

    Bank owned life insurance tax equivalent adjustment                           772                              689                                  685                            1,461       1,285
                                                                                  ---                              ---                                  ---                            -----       -----

    Total revenue (tax equivalent) (denominator A)                                    $113,982                                         $115,066                                    $107,571              $229,048 $211,478


    Operating net interest income (tax equivalent) (1)                                 $88,382                                          $87,180                                     $82,754              $175,562 $163,462

    Adjustments to arrive at operating noninterest income (tax equivalent):

    Investment securities gains, net                                                -                               -                               (229)                               -      (602)

    Gain on asset disposals                                                     (256)                            (29)                                 (2)                           (285)       (56)

    Mortgage loan repurchase liability adjustment                                   -                           (573)                                   -                           (573)          -

    Change in FDIC loss-sharing asset                                             173                              274                                  990                              447       2,093
                                                                                                                  ---

    Operating noninterest income (tax equivalent)                              24,824                           25,220                               23,384                           50,044      45,306
                                                                               ------                           ------                               ------                           ------      ------

    Total operating revenue (tax equivalent) (denominator B)                          $113,206                                         $112,400                                    $106,138              $225,606 $208,768

    Efficiency ratio (tax equivalent) (numerator A/denominator A)              60.42%                          59.95%                              59.30%                          60.19%     60.93%

    Operating efficiency ratio (tax equivalent) (numerator B/denominator B)    57.23%                          59.07%                              58.81%                          58.15%     59.12%

    __________

    (1)              Tax-exempt interest income has
                     been adjusted to a tax
                     equivalent basis. The amount of
                     such adjustment was an addition
                     to net interest income of $2.9
                     million for the three month
                     period ended June 30, 2017,
                     $2.8 million for the three
                     month periods ended March 31,
                     2017 and June 30, 2016,
                     respectively; and $5.8 million
                     and $5.3 million for the six
                     month periods ended June 30,
                     2017 and June 30, 2016,
                     respectively.

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SOURCE Columbia Banking System, Inc.