TACOMA, Wash., July 23, 2015 /PRNewswire/ -- Melanie Dressel, 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 2015 earnings, "We accomplished a lot this quarter, generating solid financial performance, especially in light of the after tax impact to earnings of $3.4 million, or $0.06 per diluted share, resulting from acquisition-related expense and FDIC acquired loan accounting. Despite intense competition, our bankers continue to expand existing and source new relationships. Their production of over $280 million in new loans represents our second highest quarterly total ever."

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Ms. Dressel continued, "We completed the core operating system conversion for our latest acquisition during the quarter and are nearing the end of the integration process. The successful conversion was the result of the outstanding efforts of everyone involved to ensure there was minimal disruption to our customers and new team members."

Significant Influences on the Quarter Ended June 30, 2015

Balance Sheet

Loans were $5.61 billion at June 30, 2015, up $161.0 million from March 31, 2015 due to robust originations during the current quarter. Securities were $1.93 billion at June 30, 2015, a decrease of $113.9 million, or 6% from $2.04 billion at March 31, 2015 primarily due to the reinvestment of cash flows into originated loans. Total deposits at June 30, 2015 were $7.04 billion, a decrease of $30.6 million from $7.07 billion at March 31, 2015. Core deposits were $6.74 billion at June 30, 2015, a decrease of $33.8 million from March 31, 2015. The average rate on interest-bearing deposits and total deposits for the quarter was 0.08% and 0.04%, respectively, compared to 0.07% and 0.04% for the first quarter of 2015.

Asset Quality

At June 30, 2015, nonperforming assets to total assets were 0.54% compared to 0.65% at March 31, 2015. Total nonperforming assets decreased $8.8 million due to a $6.1 million reduction in nonaccrual loans and a $2.7 million decline in other real estate owned due to sales activity during the current quarter.

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



                                June 30, 2015         March 31, 2015          December 31,
                                                                                  2014
                                -------------         --------------         -------------

                                                       (in thousands)

    Nonaccrual loans:

    Commercial business                       $13,539                                      $17,429        $16,799

    Real estate:

    One-to-four family
     residential                        4,193                          4,429                        2,822

    Commercial and multifamily
     residential                        3,809                          4,498                        7,847
                                        -----                          -----                        -----

    Total real estate                   8,002                          8,927                       10,669

    Real estate construction:

    One-to-four family
     residential                        1,937                          2,134                          465

    Commercial and multifamily
     residential                          469                            470                          480
                                          ---                            ---                          ---

    Total real estate
     construction                       2,406                          2,604                          945

    Consumer                            1,799                          2,868                        2,939
                                        -----                          -----                        -----

    Total nonaccrual loans             25,746                         31,828                       31,352

    Other real estate owned and
     other personal property
     owned                             20,665                         23,347                       22,225

    Total nonperforming assets                $46,411                                      $55,175        $53,577
                                              =======                                      =======        =======

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



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

                                  2015             2014 (1)              2015                           2014 (1)
                                  ----              -------              ----                            -------

                                                                    (in thousands)

    Beginning balance                              $70,234                                    $70,571                 $69,569  $72,454

    Charge-offs:

    Commercial business                (2,086)                       (1,717)                             (3,512)    (1,950)

    One-to-four family
     residential real estate             (289)                             -                               (297)      (207)

    Commercial and multifamily
     residential real estate              (43)                       (1,963)                                (43)    (2,986)

    Consumer                             (319)                         (909)                             (1,210)    (1,636)

    Purchased credit impaired (1)      (2,876)                       (3,842)                             (6,976)    (8,115)
                                        ------                         ------                               ------      ------

    Total charge-offs                  (5,613)                       (8,431)                            (12,038)   (14,894)

    Recoveries:

    Commercial business                    209                          1,712                                  827       2,202

    One-to-four family
     residential real estate                15                             12                                   27          40

    Commercial and multifamily
     residential real estate                20                            537                                3,281         576

    One-to-four family
     residential real estate
     construction                            8                            442                                   36         484

    Commercial and multifamily
     residential real estate
     construction                            2                              -                                   5           -

    Consumer                               137                            338                                  410         591

    Purchased credit impaired (1)        2,043                          1,997                                3,729       3,803
                                         -----                          -----                                -----       -----

    Total recoveries                     2,434                          5,038                                8,315       7,696
                                         -----                          -----                                -----       -----

    Net charge-offs                    (3,179)                       (3,393)                             (3,723)    (7,198)

    Provision for loan and lease
     losses (1)                          2,202                          2,117                                3,411       4,039
                                         -----                          -----                                -----       -----

    Ending balance                                 $69,257                                    $69,295                 $69,257  $69,295
                                                   =======                                    =======                 =======  =======



    (1) Reclassified to conform to the current period's
     presentation. The reclassification was limited to
     including charge-off, recovery, and provision activity
     related to the purchased credit impaired loan portfolio.

The allowance for loan losses to period end loans was 1.23% at June 30, 2015 compared to 1.29% at March 31, 2015. Excluding acquired loans, the allowance at June 30, 2015 represented 1.17% of originated loans, unchanged from March 31, 2015. The allowance to loans, excluding acquired loans, is a non-GAAP financial measure. See the section titled "Non-GAAP Financial Measures" on the last pages of this earnings release for the reconciliation of the allowance for loan losses to period end loans, excluding acquired loans.

For the second quarter of 2015, Columbia recorded a net provision for loan and lease losses of $2.2 million compared to a net provision of $2.1 million for the comparable quarter last year. The net provision for loan and lease losses recorded during the current quarter was primarily driven by the net charge-offs recorded during the quarter and growth in the loan portfolio, partially offset by improving asset quality metrics.

Net Interest Margin ("NIM")

Columbia's net interest margin (tax equivalent) of 4.41% for the second quarter of 2015 increased 2 basis points from 4.39% for the first quarter of 2015. Compared to the second quarter of 2014, Columbia's net interest margin decreased 45 basis points from 4.86%, primarily due to lower incremental accretion on acquired loans, which was $11.3 million for the prior year quarter, compared to $7.3 million for the current quarter. Columbia's operating net interest margin (tax equivalent)((1) )was 4.17% for the second quarter of 2015, relatively flat compared to 4.18% for the first quarter of 2015 and down 10 basis points compared to 4.27% for the second quarter of 2014 due as a result of the continuing low interest rate environment.

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



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

                        June 30, 2015             June 30, 2014              June 30, 2015              June 30, 2014
                        -------------             -------------              -------------              -------------

                                                          (dollars in thousands)

    Incremental
     accretion income
     due to:

    FDIC purchased
     credit impaired
     loans                               $2,367                                                 $5,734                    $4,814  $12,223

    Other FDIC acquired
     loans                         15                                    95                                         132       299

    Other acquired
     loans                      4,889                                 5,481                                       9,823    11,096
                                -----                                 -----                                       -----    ------

    Incremental
     accretion income                    $7,271                                                $11,310                   $14,769  $23,618
                                         ======                                                =======                   =======  =======


    Net interest margin
     (tax equivalent)           4.41%                                4.86%                                      4.40%    4.86%

    Operating net
     interest margin
     (tax equivalent)
     (1)                       4.17%                                4.27%                                      4.18%    4.23%


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

Impact of FDIC Acquired Loan Accounting

The following table illustrates the impact to earnings associated with Columbia's FDIC acquired loan portfolios:



                                                           FDIC Acquired Loan Accounting


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

                     June 30, 2015              June 30, 2014               June 30, 2015             June 30, 2014
                     -------------              -------------               -------------             -------------

                                                             (in thousands)

    Incremental
     accretion
     income on FDIC
     purchased
     credit impaired
     loans                             $2,367                                                  $5,734                    $4,814    $12,223

    Incremental
     accretion
     income on other
     FDIC acquired
     loans                      15                                      95                                        132        299

    Provision for
     losses on FDIC
     purchased
     credit impaired
     loans                   (476)                                (1,517)                                   (3,085)   (3,939)

    Change in FDIC
     loss-sharing
     asset                 (1,494)                                (5,050)                                   (1,344)   (9,869)

    FDIC clawback
     liability
     recovery
     (expense)                  30                                     103                                          7      (101)

    Pre-tax
     earnings impact                     $442                                                  $(635)                     $524   $(1,387)
                                         ====                                                   =====                      ====    =======

The incremental accretion income on FDIC purchased credit impaired loans represents the amount of income recorded above the contractual rate stated in the individual loan notes and stems from the discount established at the time these loan portfolios were acquired. At June 30, 2015, the accretable yield on purchased credit impaired loans was $67.3 million. Accretable yield is subject to change based upon expected future loan cash flows, which are remeasured by Columbia on a quarterly basis.

The $1.5 million change in the FDIC loss-sharing asset in the current quarter reduced noninterest income and consisted primarily of $1.4 million in amortization expense. Additional details of the components of the change in the FDIC loss-sharing asset are provided in tabular format in the section titled "Noninterest Income" in the following pages.

Second Quarter 2015 Results

Net Interest Income

Net interest income for the second quarter of 2015 was $81.0 million, an increase of $646 thousand compared to the first quarter of 2015. This increase was primarily due to higher average loan balances in the current quarter. Compared to the second quarter of 2014, net interest income increased by $5.9 million from $75.1 million. The increase from the prior year period is due to the combination of acquired loans and securities from the acquisition of Intermountain Community Bancorp ("Intermountain") and organic loan growth, partially offset by a decline in incremental accretion income. For additional information regarding net interest income, see the "Average Balances and Rates" table.

Noninterest Income

Total noninterest income was $21.5 million for the second quarter of 2015, a decrease of $1.3 million compared to $22.8 million for the first quarter of 2015. The linked quarter decline was primarily due to a $1.6 million negative variance related to the change in FDIC loss-sharing asset. For the prior quarter, the change in FDIC loss-sharing asset was a net benefit of $150 thousand, compared to a net expense in the current quarter of $1.5 million. The net benefit in the linked quarter was due to increases in the asset resulting from loan impairment and OREO write-down activity. Additional details of the components of the change in the FDIC loss-sharing asset are provided in tabular format below. Also contributing to the linked quarter decrease in noninterest income was a reduction in investment securities gains, which were $378 thousand lower in the current quarter than in the first quarter of 2015. These decreases were partially offset by a $1.0 million increase in service charges and other fees compared to the first quarter of 2015.

Compared to the second quarter of 2014, noninterest income increased by $6.8 million. The increase from the prior year period was due to both a $2.1 million increase in service charges and other fees and the change in FDIC loss-sharing asset which was a net expense of $1.5 million in the current quarter compared to an expense of $5.1 million in the second quarter of 2014. The growth in service charges and other fees resulted primarily from the increased customer base from the acquisition of Intermountain.

The change in the FDIC loss-sharing asset has been a significant component of noninterest income. The following table reflects the income statement components of the change in the FDIC loss-sharing asset:



                                   Three Months Ended                      Six Months Ended

                                        June 30,                               June 30,
                                        --------                               --------

                                 2015                 2014                2015                    2014
                                 ----                 ----                ----                    ----

                                                           (in thousands)

    Adjustments reflected in
     income

    Amortization, net         (1,376)                       (5,764)                         (3,670)    (12,216)

    Loan impairment                 1                          1,214                            1,532        3,151

    Sale of other real estate   (208)                         (965)                           (627)     (1,721)

    Write-downs of other real
     estate                        52                            276                            1,124          792

    Other                          37                            189                              297          125
                                  ---                            ---

    Change in FDIC loss-
     sharing asset                       $(1,494)                               $(5,050)               $(1,344)    $(9,869)
                                          =======                                 =======                 =======      =======

Noninterest Expense

Total noninterest expense for the second quarter of 2015 was $68.5 million, an increase of $1.7 million compared to $66.7 million for the first quarter of 2015. This increase was driven by higher acquisition-related expenses in the current quarter of $5.6 million compared to $3.0 million for the first quarter of 2015. After taking into account the acquisition-related expenses, ongoing noninterest expense for the current quarter was $932 thousand lower than the first quarter of 2015 on the same basis. Clint Stein, Columbia's Executive Vice President and Chief Financial Officer stated, "With the Intermountain core system conversion behind us, the added costs associated with running multiple platforms has subsided and we have started to more fully realize the resulting efficiency in our expense numbers."

Compared to the second quarter of 2014, noninterest expense increased $10.7 million, or 19% from $57.8 million, due to the $5.0 million increase in acquisition-related expenses as well as additional ongoing expense resulting from the Intermountain acquisition, partially offset by the $563 thousand benefit recorded in the current quarter related to OREO compared to a benefit of only $97 thousand recorded during the second quarter of 2014.

Organizational Update

Melanie Dressel commented, "We were delighted that Columbia Bank was recently voted the "Best Large Business" 2015 by readers of South Sound Magazine during their annual poll. We were also named one of "Washington's Best Workplaces" 2015 by the Puget Sound Business Journal for the ninth consecutive year. These awards are a true testament to our wonderful employees and their dedication to customer service. I was also very pleased and proud when Clint Stein was named a Puget Sound Business Journal CFO of the year. The award celebrates financial executives in Washington whose leadership, guidance and knowledge contribute greatly to the success of their companies. Clint is certainly very deserving of the honor."

Conference Call Information

Columbia's management will discuss the second quarter 2015 results on a conference call scheduled for Thursday, July 23, 2015 at 1:00 p.m. PDT (4:00 pm EDT). Interested parties may listen to this discussion by calling 1-866-378-3802; Conference ID code #22782056.

A conference call replay will be available from approximately 4:00 p.m. PDT on July 23, 2015 through midnight PDT on July 30, 2015. The conference call replay can be accessed by dialing 1-855-859-2056 and entering Conference ID code #22782056.

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 over 150 branches throughout Washington, Oregon and Idaho. Columbia ranked 17th best on the 2015 Forbes list of best banks in the country, as well as ranking the best in Washington and second in the Pacific Northwest for the fourth year in a row.

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, which management believes are a benefit to shareholders. These forward looking statements describe 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" and 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 risk and uncertainty 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, 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 may reduce interest margins more than expected 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; and (6) legislation or regulatory requirements or changes may adversely affect the businesses in which Columbia is engaged. 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. We undertake no obligation to update or revise any forward-looking statements, whether as a result of new information, future events or otherwise. 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.



    Contacts:                            Melanie J. Dressel,

                                               President and

                                     Chief Executive Officer

                                              (253) 305-1911


                                             Clint E. Stein,

                                    Executive Vice President

                                         and Chief Financial
                                                     Officer

                                              (253) 593-8304



    FINANCIAL STATISTICS

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

    Unaudited                                                             June 30,                                                June 30,
                                                                          --------                                                --------

                                                                 2015                         2014                           2015                         2014
                                                                 ----                         ----                           ----                         ----

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

    Net interest income                                                     $81,010                                                     $75,124                                                 $161,374                                                  $149,064

    Provision for loan and lease losses                                      $2,202                                                      $2,117                                                   $3,411                                                    $4,039

    Noninterest income                                                      $21,462                                                     $14,627                                                  $44,229                                                   $28,635

    Noninterest expense                                                     $68,471                                                     $57,764                                                 $135,205                                                  $115,150

    Acquisition-related expense
     (included in noninterest expense)                                       $5,643                                                        $672                                                   $8,617                                                    $1,638

    Net income                                                              $21,946                                                     $21,227                                                  $46,307                                                   $41,071

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

    Earnings (basic)                                                          $0.38                                                       $0.40                                                    $0.80                                                     $0.79

    Earnings (diluted)                                                        $0.38                                                       $0.40                                                    $0.80                                                     $0.77

    Book value                                                               $21.38                                                      $20.71                                                   $21.38                                                    $20.71

    Averages
    --------

    Total assets                                                         $8,532,173                                                  $7,229,187                                               $8,519,047                                                $7,186,709

    Interest-earning assets                                              $7,560,288                                                  $6,339,102                                               $7,544,750                                                $6,292,157

    Loans                                                                $5,542,489                                                  $4,646,356                                               $5,479,067                                                $4,592,033

    Securities, including Federal Home
     Loan Bank stock                                                     $1,976,959                                                  $1,645,993                                               $2,022,629                                                $1,664,081

    Deposits                                                             $6,978,472                                                  $5,968,881                                               $6,953,254                                                $5,935,544

    Interest-bearing deposits                                            $3,753,101                                                  $3,807,710                                               $3,954,179                                                $3,790,137

    Interest-bearing liabilities                                         $3,961,013                                                  $3,901,016                                               $4,177,057                                                $3,884,628

    Noninterest-bearing deposits                                         $3,225,371                                                  $2,161,171                                               $2,999,075                                                $2,145,407

    Shareholders' equity                                                 $1,247,887                                                  $1,084,927                                               $1,244,389                                                $1,076,189

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

    Return on average assets                                    1.03%                                      1.17%                                      1.09%                                      1.14%

    Return on average common equity                             7.04%                                      7.83%                                      7.45%                                      7.64%

    Average equity to average assets                           14.63%                                     15.01%                                     14.61%                                     14.97%

    Net interest margin (tax equivalent)                        4.41%                                      4.86%                                      4.40%                                      4.86%

    Efficiency ratio (tax equivalent)
     (1)                                                      64.96%                                     62.61%                                     63.95%                                     63.06%

    Operating efficiency ratio (tax
     equivalent) (2)                                           60.78%                                     63.80%                                     61.90%                                     64.49%


                                                                        June 30,                               December 31,
                                                                        --------

    Period end                                                   2015                         2014                           2014
    ----------                                                   ----                         ----                           ----

    Total assets                                                         $8,518,019                                                  $7,297,458                                               $8,578,846

    Loans, net of unearned income                                        $5,611,897                                                  $4,714,575                                               $5,445,378

    Allowance for loan and lease losses                                     $69,257                                                     $69,295                                                  $69,569

    Securities, including Federal Home
     Loan Bank stock                                                     $1,926,248                                                  $1,621,929                                               $2,131,622

    Deposits                                                             $7,044,373                                                  $5,985,069                                               $6,924,722

    Core deposits                                                        $6,737,969                                                  $5,735,047                                               $6,619,944

    Shareholders' equity                                                 $1,236,214                                                  $1,092,151                                               $1,228,175

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

    Nonaccrual loans                                                        $25,746                                                     $30,613                                                  $31,352

    Other real estate owned ("OREO") and
     other personal property owned
     ("OPPO")                                                  20,665                                      28,254                                      22,225

       Total nonperforming assets                                           $46,411                                                     $58,867                                                  $53,577
                                                                            =======                                                     =======                                                  =======

    Nonperforming loans to period-end
     loans                                                      0.46%                                      0.65%                                      0.58%

    Nonperforming assets to period-end
     assets                                                     0.54%                                      0.81%                                      0.62%

    Allowance for loan and lease losses
     to period-end loans                                        1.23%                                      1.47%                                      1.28%

    Net loan charge-offs                                                     $3,723                           (3)                        $7,198                           (4)                     $9,612                            (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 pages of this earnings release for the reconciliation of the operating efficiency ratio (tax equivalent) to the efficiency ratio (tax
     equivalent).

    (3) For the six months ended June 30, 2015.

    (4) For the six months ended June 30, 2014.

    (5) For the twelve months ended December 31, 2014.



    FINANCIAL STATISTICS

    Columbia Banking
     System, Inc.

    Unaudited                             June 30,                                    December 31,

                                                         2015                                      2014
                                                         ----                                      ----

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

    Commercial business                   $2,255,468                          40.2%                                       $2,119,565           38.9%

    Real estate:

    One-to-four family
     residential                181,849                                  3.2%                         175,571                            3.2%

    Commercial and
     multifamily
     residential              2,406,594                                 42.9%                       2,363,541                           43.5%
                              ---------                                  ----                        ---------                            ----

       Total real estate      2,588,443                                 46.1%                       2,539,112                           46.7%

    Real estate
     construction:

    One-to-four family
     residential                127,311                                  2.3%                         116,866                            2.1%

    Commercial and
     multifamily
     residential                129,302                                  2.3%                         134,443                            2.5%
                                -------                                   ---                          -------                             ---

       Total real estate
        construction            256,613                                  4.6%                         251,309                            4.6%

    Consumer                    358,365                                  6.4%                         364,182                            6.7%

    Purchased credit
     impaired                   202,367                                  3.6%                         230,584                            4.2%
                                -------                                   ---                          -------                             ---

    Subtotal loans            5,661,256                                100.9%                       5,504,752                          101.1%

    Less:  Net unearned
     income                    (49,359)                               (0.9)%                        (59,374)                         (1.1)%
                                -------                                 -----                          -------                           -----

    Loans, net of unearned
     income                   5,611,897                                100.0%                       5,445,378                          100.0%
                                                                       =====                                                           =====

    Less:  Allowance for
     loan and lease losses     (69,257)                                                 (69,569)

    Total loans, net          5,542,640                                                 5,375,809
                              =========                                                 =========

    Loans held for sale                       $4,220                                                               $1,116
                                              ======                                                               ======


                                        June 30,                                December 31,

                                                         2015                                      2014
                                                         ----                                      ----

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

    Core deposits:

    Demand and other non-
     interest bearing                     $3,207,538                          45.5%                                       $2,651,373           38.3%

    Interest bearing
     demand                     912,637                                 13.0%                       1,304,258                           18.8%

    Money market              1,718,000                                 24.4%                       1,760,331                           25.4%

    Savings                     630,897                                  9.0%                         615,721                            8.9%

    Certificates of
     deposit less than
     $100,000                   268,897                                  3.8%                         288,261                            4.2%
                                -------                                   ---                          -------                             ---

       Total core deposits    6,737,969                                 95.7%                       6,619,944                           95.6%


    Certificates of
     deposit greater than
     $100,000                   194,449                                  2.7%                         202,014                            2.9%

    Certificates of
     deposit insured by
     CDARS(R)                    18,357                                  0.3%                          18,429                            0.3%

    Brokered money market
     accounts                    93,061                                  1.3%                          83,402                            1.2%
                                 ------                                                                ------

    Subtotal                  7,043,836                                100.0%                       6,923,789                          100.0%
                                                                       =====                                                           =====

       Premium resulting from
        acquisition date fair
        value adjustment            537                                                       933
                                    ---                                                       ---

    Total deposits                        $7,044,373                                                           $6,924,722
                                          ==========                                                           ==========



    QUARTERLY FINANCIAL STATISTICS

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

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

                                        2015                      2015                        2014                    2014                   2014
                                        ----                      ----                        ----                    ----                   ----

                                                         (dollars in thousands except per share)

    Earnings
    --------

    Net interest income                         $81,010                                     $80,364                           $78,764                           $76,220    $75,124

    Provision for loan and
     lease losses                                $2,202                                      $1,209                            $1,708                              $980     $2,117

    Noninterest income                          $21,462                                     $22,767                           $15,185                           $15,930    $14,627

    Noninterest expense                         $68,471                                     $66,734                           $64,154                           $59,982    $57,764

    Acquisition-related
     expense (included in
     noninterest expense)                        $5,643                                      $2,974                            $4,556                            $3,238       $672

    Net income                                  $21,946                                     $24,361                           $18,920                           $21,583    $21,227

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

    Earnings (basic)                              $0.38                                       $0.42                             $0.34                             $0.41      $0.40

    Earnings (diluted)                            $0.38                                       $0.42                             $0.34                             $0.41      $0.40

    Book value                                   $21.38                                      $21.53                            $21.34                            $20.78     $20.71

    Averages
    --------

    Total assets                             $8,532,173                                  $8,505,776                        $8,152,463                        $7,337,306 $7,229,187

    Interest-earning assets                  $7,560,288                                  $7,529,040                        $7,199,443                        $6,451,660 $6,339,102

    Loans                                    $5,542,489                                  $5,414,942                        $5,168,761                        $4,770,443 $4,646,356

    Securities, including
     Federal Home Loan Bank
     stock                                   $1,976,959                                  $2,068,806                        $1,918,690                        $1,585,996 $1,645,993

    Deposits                                 $6,978,472                                  $6,927,756                        $6,759,259                        $6,110,809 $5,968,881

    Interest-bearing deposits                $3,753,101                                  $4,157,491                        $4,174,459                        $3,847,730 $3,807,710

    Interest-bearing
     liabilities                             $3,961,013                                  $4,395,502                        $4,282,273                        $3,889,233 $3,901,016

    Noninterest-bearing
     deposits                                $3,225,371                                  $2,770,265                        $2,584,800                        $2,263,079 $2,161,171

    Shareholders' equity                     $1,247,887                                  $1,240,853                        $1,185,346                        $1,099,512 $1,084,927

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

    Return on average assets           1.03%                      1.15%                              0.93%                    1.18%                1.17%

    Return on average common
     equity                            7.04%                      7.86%                              6.39%                    7.86%                7.83%

    Average equity to average
     assets                           14.63%                     14.59%                             14.54%                   14.99%               15.01%

    Net interest margin (tax
     equivalent)                       4.41%                      4.39%                              4.50%                    4.85%                4.86%

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

    Total assets                             $8,518,019                                  $8,552,902                        $8,578,846                        $7,466,081 $7,297,458

    Loans, net of unearned
     income                                  $5,611,897                                  $5,450,895                        $5,445,378                        $4,823,022 $4,714,575

    Allowance for loan and
     lease losses                               $69,257                                     $70,234                           $69,569                           $67,871    $69,295

    Securities, including
     Federal Home Loan Bank
     stock                                   $1,926,248                                  $2,040,163                        $2,131,622                        $1,643,003 $1,621,929

    Deposits                                 $7,044,373                                  $7,074,965                        $6,924,722                        $6,244,401 $5,985,069

    Core deposits                            $6,737,969                                  $6,771,755                        $6,619,944                        $5,990,118 $5,735,047

    Shareholders' equity                     $1,236,214                                  $1,244,443                        $1,228,175                        $1,096,211 $1,092,151

    Nonperforming, assets
    ---------------------

    Nonaccrual loans                            $25,746                                     $31,828                           $31,352                           $27,998    $30,613

    OREO and OPPO                     20,665                      23,347                              22,225                    21,941                28,254
                                      ------                      ------                              ------                    ------                ------

       Total nonperforming assets               $46,411                                     $55,175                           $53,577                           $49,939    $58,867
                                                -------                                     -------                           -------                           -------    -------

    Nonperforming loans to
     period-end loans                  0.46%                      0.58%                              0.58%                    0.58%                0.65%

    Nonperforming assets to
     period-end assets                 0.54%                      0.65%                              0.62%                    0.67%                0.81%

    Allowance for loan and
     lease losses to period-
     end loans                         1.23%                      1.29%                              1.28%                    1.41%                1.47%

    Net loan charge-offs                         $3,179                                        $544                               $10                            $2,404     $3,393



    CONSOLIDATED STATEMENTS OF INCOME

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

    Unaudited                                   June 30,                                             June 30,
                                                --------                                             --------

                                         2015                     2014                      2015                   2014
                                         ----                     ----                      ----                   ----

                                                             (in thousands except per share)

    Interest Income

    Loans                                         $71,744                                         $67,004                $142,566  $132,545

    Taxable securities                  7,260                                6,382                              14,786      13,134

    Tax-exempt securities               3,010                                2,671                               6,052       5,289

    Deposits in banks                      26                                   30                                  53          44
                                          ---                                  ---                                 ---         ---

    Total interest income              82,040                               76,087                             163,457     151,012

    Interest Expense

    Deposits                              740                                  729                               1,488       1,481

    Federal Home Loan Bank
     advances                             154                                  115                                 313         229

    Other borrowings                      136                                  119                                 282         238
                                          ---                                  ---                                 ---         ---

    Total interest expense              1,030                                  963                               2,083       1,948
                                        -----                                  ---                               -----       -----

    Net Interest Income                81,010                               75,124                             161,374     149,064

    Provision for loan and
     lease losses                       2,202                                2,117                               3,411       4,039
                                        -----                                -----                               -----       -----

    Net interest income after
     provision for loan and
     lease losses                      78,808                               73,007                             157,963     145,025

    Noninterest Income

    Service charges and other
     fees                              15,874                               13,790                              30,743      26,726

    Merchant services fees              2,340                                2,040                               4,380       3,910

    Investment securities
     gains, net                           343                                  296                               1,064         519

    Bank owned life insurance           1,206                                  976                               2,284       1,941

    Change in FDIC loss-
     sharing asset                    (1,494)                             (5,050)                            (1,344)    (9,869)

    Other                               3,193                                2,575                               7,102       5,408
                                        -----                                -----                               -----       -----

    Total noninterest income           21,462                               14,627                              44,229      28,635

    Noninterest Expense

    Compensation and employee
     benefits                          38,446                               31,064                              77,546      62,402

    Occupancy                           8,687                                8,587                              16,680      16,831

    Merchant processing                 1,079                                  998                               2,056       1,978

    Advertising and promotion           1,195                                  950                               2,126       1,719

    Data processing and
     communications                     4,242                                3,680                               9,226       7,200

    Legal and professional
     fees                               2,847                                2,303                               5,354       4,472

    Taxes, licenses and fees            1,427                                1,051                               2,659       2,231

    Regulatory premiums                 1,321                                1,073                               2,542       2,249

    Net cost (benefit) of
     operation of other real
     estate                             (563)                                (97)                            (1,809)         49

    Amortization of
     intangibles                        1,718                                1,480                               3,535       3,060

    Other                               8,072                                6,675                              15,290      12,959
                                        -----                                -----                              ------      ------

    Total noninterest expense          68,471                               57,764                             135,205     115,150
                                       ------                               ------                             -------     -------

    Income before income taxes         31,799                               29,870                              66,987      58,510

    Provision for income taxes          9,853                                8,643                              20,680      17,439
                                        -----                                -----                              ------      ------

    Net Income                                    $21,946                                         $21,227                 $46,307   $41,071
                                                  =======                                         =======                 =======   =======

    Earnings per common share

    Basic                                           $0.38                                           $0.40                   $0.80     $0.79

    Diluted                                         $0.38                                           $0.40                   $0.80     $0.77

    Dividends paid per common
     share                                          $0.34                                           $0.24                   $0.64     $0.36

    Weighted average number of
     common shares outstanding         57,055                               52,088                              56,999      51,600

    Weighted average number of
     diluted common shares
     outstanding                       57,069                               52,494                              57,012      52,463



    CONSOLIDATED BALANCE SHEETS

    Columbia Banking System, Inc.

    Unaudited                                                                                                                                                                    June 30,                December 31,

                                                                                                                                                              2015                          2014
                                                                                                                                                              ----                          ----

                                                                                                                                                                     (in thousands)

                                                                                             ASSETS

    Cash and due from banks                                                                                                                $172,139                                       $171,221

    Interest-earning deposits with banks                                                                                       5,564                           16,949
                                                                                                                               -----                           ------

    Total cash and cash equivalents                                                                                          177,703                          188,170

    Securities available for sale at fair value (amortized cost of $1,907,403 and $2,087,069, respectively)                1,914,445                        2,098,257

    Federal Home Loan Bank stock at cost                                                                                      11,803                           33,365

    Loans held for sale                                                                                                        4,220                            1,116

    Loans, net of unearned income of ($49,359) and ($59,374), respectively                                                 5,611,897                        5,445,378

    Less: allowance for loan and lease losses                                                                                 69,257                           69,569
                                                                                                                              ------                           ------

    Loans, net                                                                                                             5,542,640                        5,375,809

    FDIC loss-sharing asset                                                                                                    9,344                           15,174

    Interest receivable                                                                                                       27,483                           27,802

    Premises and equipment, net                                                                                              170,380                          172,090

    Other real estate owned                                                                                                   20,617                           22,190

    Goodwill                                                                                                                 382,537                          382,537

    Other intangible assets, net                                                                                              26,924                           30,459

    Other assets                                                                                                             229,923                          231,877

    Total assets                                                                                                                         $8,518,019                                     $8,578,846
                                                                                                                                         ==========                                     ==========

                                                                              LIABILITIES AND SHAREHOLDERS' EQUITY

    Deposits:

    Noninterest-bearing                                                                                                                  $3,207,538                                     $2,651,373

    Interest-bearing                                                                                                       3,836,835                        4,273,349
                                                                                                                           ---------                        ---------

    Total deposits                                                                                                         7,044,373                        6,924,722

    Federal Home Loan Bank advances                                                                                           45,549                          216,568

    Securities sold under agreements to repurchase                                                                            92,230                          105,080

    Other borrowings                                                                                                                                             -                                  8,248

    Other liabilities                                                                                                         99,653                           96,053
                                                                                                                              ------                           ------

    Total liabilities                                                                                                      7,281,805                        7,350,671

    Commitments and contingent liabilities

                                                                                                               June 30,                December 31,

                                                                                                                    2015                        2014
                                                                                                                    ----                        ----

    Preferred stock (no par
     value)                                                                                                             (in thousands)

    Authorized shares                                                                                              2,000                              2,000

    Issued and outstanding                                                                                             9                                  9                                   2,217                     2,217

    Common stock (no par value)

    Authorized shares                                                                                            115,000                             63,033

    Issued and outstanding                                                                                        57,709                             57,437                                 987,320                   985,839

    Retained earnings                                                                                                        243,888                          234,498

    Accumulated other comprehensive income                                                                                     2,789                            5,621
                                                                                                                               -----                            -----

    Total shareholders' equity                                                                                             1,236,214                        1,228,175

    Total liabilities and shareholders' equity                                                                                           $8,518,019                                     $8,578,846
                                                                                                                                         ==========                                     ==========



    AVERAGE BALANCES AND RATES

    Columbia Banking System, Inc.

    Unaudited

                                                    Three Months Ended June 30,                                         Three Months Ended June 30,
                                                    ---------------------------                                         ---------------------------

                                                                                        2015                                                               2014 (1)
                                                                                        ----                                                                -------

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

                                                                                (dollars in thousands)

    ASSETS

    Loans, net (1)(2)(3)                           $5,542,489                                         $72,410                         5.23%                                    $4,646,356                        $67,429          5.80%

    Taxable securities                   1,516,740                               7,260                             1.91%                          1,281,753                          6,382                 1.99%

    Tax exempt securities (3)              460,219                               4,632                             4.03%                            364,240                          4,192                 4.60%

    Interest-earning deposits
     with banks                             40,840                                  26                             0.25%                             46,753                             30                 0.26%
                                            ------                                 ---                                                               ------                            ---

    Total interest-earning assets        7,560,288                                         $84,328                           4.46%                            6,339,102                            $78,033               4.92%

    Other earning assets                   148,573                                                                               130,462

    Noninterest-earning assets             823,312                                                                               759,623
                                           -------                                                                               -------

    Total assets                                   $8,532,173                                                                                   $7,229,187
                                                   ==========                                                                                   ==========

    LIABILITIES AND SHAREHOLDERS' EQUITY

    Certificates of deposit                          $489,984                                            $236                         0.19%                                      $480,459                           $325          0.27%

    Savings accounts                       626,930                                  17                             0.01%                            527,370                             14                 0.01%

    Interest-bearing demand                883,366                                 155                             0.07%                          1,187,274                            115                 0.04%

    Money market accounts                1,752,821                                 332                             0.08%                          1,612,607                            275                 0.07%
                                         ---------                                 ---                                                            ---------                            ---

    Total interest-bearing
     deposits                            3,753,101                                 740                             0.08%                          3,807,710                            729                 0.08%

    Federal Home Loan Bank
     advances                              121,828                                 154                             0.51%                             68,306                            115                 0.67%

    Other borrowings                        86,084                                 136                             0.63%                             25,000                            119                 1.90%
                                            ------                                 ---                                                               ------                            ---

    Total interest-bearing
     liabilities                         3,961,013                                          $1,030                           0.10%                            3,901,016                               $963               0.10%

    Noninterest-bearing deposits         3,225,371                                                                             2,161,171

    Other noninterest-bearing
     liabilities                            97,902                                                                                82,073

    Shareholders' equity                 1,247,887                                                                             1,084,927
                                         ---------                                                                             ---------

    Total liabilities &
     shareholders' equity                          $8,532,173                                                                                   $7,229,187
                                                   ==========                                                                                   ==========

    Net interest income (tax equivalent)                                                                  $83,298                                                                          $77,070
                                                                                                          =======                                                                          =======

    Net interest margin (tax equivalent)                                                                                                                        4.41%                                                      4.86%
                                                                                                                                                                 ====                                                        ====


    (1)               Adjusted to conform to the
                      current period presentation. The
                      adjustment was limited to
                      including amounts historically
                      disclosed as "Covered loans" in
                      "Loans, net".

    (2)               Nonaccrual loans have been
                      included in the tables as loans
                      carrying a zero yield. Amortized
                      net deferred loan fees and net
                      unearned discounts on certain
                      acquired loans were included in
                      the interest income
                      calculations. The amortization
                      of net deferred loan fees was
                      $1.5 million and $1.2 million
                      for the three months ended June
                      30, 2015 and 2014, respectively.
                      The incremental accretion on
                      acquired loans was $7.3 million
                      and $11.3 million for the three
                      months ended June 30, 2015 and
                      2014, respectively.

    (3)               Yields on a fully tax equivalent
                      basis. The tax equivalent yield
                      adjustment to interest earned on
                      loans was $666 thousand and $425
                      thousand for the three months
                      ended June 30, 2015 and 2014,
                      respectively. The tax equivalent
                      yield adjustment to interest
                      earned on tax exempt securities
                      was $1.6 million and $1.5
                      million for the three months
                      ended June 30, 2015 and 2014,
                      respectively.



    AVERAGE BALANCES AND RATES

    Columbia Banking System, Inc.

    Unaudited

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

                                                                                    2015                                                               2014 (1)
                                                                                    ----                                                                -------

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

                                                                                     (dollars in thousands)

    ASSETS

    Loans, net (1)(2)(3)                           $5,479,067                                     $143,897                       5.25%                                   $4,592,033                         $133,327       5.81%

    Taxable securities                   1,562,776                           14,787                            1.89%                      1,305,584                           13,134                  2.01%

    Tax exempt securities (3)              459,853                            9,311                            4.05%                        358,497                            8,301                  4.63%

    Interest-earning deposits
     with banks                             43,054                               53                            0.25%                         36,043                               44                  0.24%
                                            ------                              ---                                                          ------                              ---

    Total interest-earning assets        7,544,750                                    $168,048                          4.45%                             6,292,157                          $154,806                4.92%

    Other earning assets                   147,321                                                                          128,703

    Noninterest-earning assets             826,976                                                                          765,849
                                           -------                                                                          -------

    Total assets                                   $8,519,047                                                                           $7,186,709
                                                   ==========                                                                           ==========

    LIABILITIES AND SHAREHOLDERS' EQUITY

    Certificates of deposit                          $496,101                                         $476                       0.19%                                     $491,731                             $687       0.28%

    Savings accounts                       626,036                               36                            0.01%                        520,678                               28                  0.01%

    Interest-bearing demand              1,047,844                              293                            0.06%                      1,178,042                              223                  0.04%

    Money market accounts                1,784,198                              683                            0.08%                      1,599,686                              543                  0.07%
                                         ---------                              ---                                                       ---------                              ---

    Total interest-bearing
     deposits                            3,954,179                            1,488                            0.08%                      3,790,137                            1,481                  0.08%

    Federal Home Loan Bank
     advances                              125,812                              313                            0.50%                         69,491                              229                  0.66%

    Other borrowings                        97,066                              282                            0.58%                         25,000                              238                  1.90%
                                            ------                              ---                                                          ------                              ---

    Total interest-bearing
     liabilities                         4,177,057                                      $2,083                          0.10%                             3,884,628                            $1,948                0.10%

    Noninterest-bearing deposits         2,999,075                                                                        2,145,407

    Other noninterest-bearing
     liabilities                            98,526                                                                           80,485

    Shareholders' equity                 1,244,389                                                                        1,076,189
                                         ---------                                                                        ---------

    Total liabilities &
     shareholders' equity                          $8,519,047                                                                           $7,186,709
                                                   ==========                                                                           ==========

    Net interest income (tax equivalent)                                                              $165,965                                                                       $152,858
                                                                                                      ========                                                                       ========

    Net interest margin (tax equivalent)     4.40%                                                                    4.86%
                                              ====                                                                      ====


    (1)               Adjusted to conform to the
                      current period presentation. The
                      adjustment was limited to
                      including historically disclosed
                      "covered loans" amounts into the
                      respective row for loans, net as
                      covered loans are no longer
                      disclosed separately in the
                      consolidated balance sheets or
                      statements of income.

    (2)               Nonaccrual loans have been
                      included in the table as loans
                      carrying a zero yield. Amortized
                      net deferred loan fees and net
                      unearned discounts on certain
                      acquired loans were included in
                      the interest income
                      calculations. The amortization
                      of net deferred loan fees was
                      $2.6 million and $2.1 million
                      for the six months ended June
                      30, 2015 and 2014, respectively.
                      The incremental accretion on
                      certain loans was $14.8 million
                      and $23.6 million for the six
                      months ended June 30, 2015 and
                      2014, respectively.

    (3)               Yields on a fully tax equivalent
                      basis. The tax equivalent yield
                      adjustment to interest earned on
                      loans was $1.3 million and $782
                      thousand for the six months
                      ended June 30, 2015 and 2014,
                      respectively. The tax equivalent
                      yield adjustment to interest
                      earned on tax exempt securities
                      was $3.3 million and $3.0
                      million for the six months ended
                      June 30, 2015 and 2014,
                      respectively.

Non-GAAP Financial Measures

The Company considers its operating net interest margin and operating efficiency ratios to be important measurements as they more closely reflect the ongoing operating performance of the Company. Despite the importance 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. Also, there may be limits in the usefulness of these measures to investors. As a result, 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 June 30,                                     Six Months Ended June 30,
                                   ---------------------------

                              2015                         2014                      2015                       2014
                              ----                         ----                      ----                       ----

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

    Net interest income
     (tax equivalent) (1)                $83,298                                             $77,070                           $165,965    $152,858
                                         -------                                             -------                           --------    --------

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

    Incremental accretion
     income on FDIC
     purchased credit
     impaired loans        (2,367)                                 (5,734)                                (4,814)            (12,223)

    Incremental accretion
     income on other FDIC
     acquired loans           (15)                                    (95)                                  (132)               (299)

    Incremental accretion
     income on other
     acquired loans        (4,889)                                 (5,481)                                (9,823)            (11,096)

    Premium amortization
     on acquired
     securities              2,706                                    1,554                                   5,567                3,179

    Interest reversals on
     nonaccrual loans          156                                      392                                     806                  680

    Operating net interest
     income (tax
     equivalent) (1)                     $78,889                                             $67,706                           $157,569    $133,099
                                         =======                                             =======                           ========    ========

    Average interest
     earning assets                   $7,560,288                                          $6,339,102                         $7,544,750  $6,292,157

    Net interest margin
     (tax equivalent) (1)    4.41%                                   4.86%                                  4.40%               4.86%

    Operating net interest
     margin (tax
     equivalent) (1)         4.17%                                   4.27%                                  4.18%               4.23%


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

                              2015                         2014                      2015                       2014
                              ----                         ----                      ----                       ----

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

    Noninterest expense
     (numerator A)                       $68,471                                             $57,764                           $135,205    $115,150

    Adjustments to arrive
     at operating
     noninterest expense:

    Acquisition-related
     expenses              (5,643)                                   (672)                                (8,617)             (1,638)

    Net benefit of
     operation of OREO and
     OPPO                      561                                      117                                   1,802                   95

    FDIC clawback
     liability expense          30                                      103                                       7                (101)

    Loss on asset
     disposals                (10)                                   (431)                                  (106)               (450)

    State of Washington
     Business and
     Occupation ("B&O")
     taxes                 (1,327)                                   (972)                                (2,456)             (2,047)

    Operating noninterest
     expense (numerator B)               $62,082                                             $55,909                           $125,835    $111,009


    Net interest income
     (tax equivalent) (1)                $83,298                                             $77,070                           $165,965    $152,858

    Noninterest income      21,462                                   14,627                                  44,229               28,635

    Bank owned life
     insurance tax
     equivalent adjustment     649                                      556                                   1,230                1,105
                               ---                                      ---                                   -----                -----

    Total revenue (tax
     equivalent)
     (denominator A)                    $105,409                                             $92,253                           $211,424    $182,598


    Operating net interest
     income (tax
     equivalent) (1)                     $78,889                                             $67,706                           $157,569    $133,099

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

    Investment securities
     gains, net              (343)                                   (296)                                (1,064)               (519)

    Gain on asset
     disposals                 (5)                                    (18)                                    (5)                (50)

    Change in FDIC loss-
     sharing asset           1,494                                    5,050                                   1,344                9,869

    Operating noninterest
     income (tax
     equivalent)            23,257                                   19,919                                  45,734               39,040
                            ------                                   ------                                  ------               ------

    Total operating
     revenue (tax
     equivalent)
     (denominator B)                    $102,146                                             $87,625                           $203,303    $172,139

    Efficiency ratio (tax
     equivalent)
     (numerator A/
     denominator A)         64.96%                                  62.61%                                 63.95%              63.06%

    Operating efficiency
     ratio (tax
     equivalent)
     (numerator B/
     denominator B)         60.78%                                  63.80%                                 61.90%              64.49%



    (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 $2.3 million and $1.9 million for the
     three months ended June 30, 2015 and 2014, respectively, and an
     addition to net interest income of $4.6 million and $3.8 million
     for the six months ended June 30, 2015 and 2014, respectively.

Non-GAAP Financial Measures - Continued

The Company considers its ratio of allowance for loan and lease losses to period-end loans, excluding acquired loans to be an important measurement because it more closely reflects the ongoing allowance coverage and provides a ratio that is more comparable to other bank holding companies that have not had similar acquisitions. Despite the importance of this ratio to the Company, there are no standardized definitions for it and, as a result, the Company's calculations may not be comparable with other organizations. Also, there may be limits in the usefulness of this measure to investors. As a result, the Company encourages readers to consider its consolidated financial statements in their entirety and not to rely on any single financial measure.

The following table reconciles the Company's calculation of the allowance for loan and lease losses to period-end loans, excluding acquired loans:



                            June 30,                 March 31,                 December 31,

                                  2015                      2015                         2014
                                  ----                      ----                         ----

                                                  (dollars in thousands)

    Allowance for loan and
     lease losses
     (numerator A)                        $69,257                                                $70,234                       $69,569

    Less: Allowance for
     loan and lease losses
     attributable to
     acquired loans           (20,941)                               (24,100)                             (23,212)
                               -------                                 -------                               -------

    Equals: Allowance for
     loan and lease
     losses, excluding
     acquired loans
     (numerator B)                        $48,316                                     46,134                         46,357


    Loans, net of unearned
     income (denominator
     A)                                $5,611,897                                             $5,450,895                    $5,445,378

    Less: acquired loans,
     net                   (1,481,817)                             (1,519,334)                           (1,615,496)
                            ----------                              ----------                            ----------

    Equals: Loans,
     excluding acquired
     loans, net of
     unearned income
     (denominator B)                   $4,130,080                                             $3,931,561                    $3,829,882


    Allowance for loan and
     lease losses to
     period-end loans
     (numerator A/
     denominator A)              1.23%                                  1.29%                                1.28%

    Allowance for loan and
     lease losses to
     period-end loans,
     excluding acquired
     loans (numerator B/
     denominator B)              1.17%                                  1.17%                                1.21%

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SOURCE Columbia Banking System, Inc.