The economic impact of Britain's decision to leave the European Union is seen compressing earnings further at a time that regional banks are already grappling with poor returns, higher regulatory costs and rising non-performing loans.

The regional banking index <.SX7P> fell more than 5 percent on Monday and neared levels last seen in the aftermath of 2011's eurozone debt crisis.

Other financials also suffered with the STOXX Europe 600 Insurance index <.SXIP> down 4 percent to its lowest level since December 2013.

Italian and UK banks took center stage. In Italy, UniCredit (>> UniCredit SpA) fell 7.2 percent while Intesa fell 7.6 percent, as the Italian government said it was looking at various policy options to help its banks and prevent further falls in their share prices.

In the UK, shares of Royal Bank of Scotland (>> Royal Bank of Scotland Group plc) and Barclays (>> Barclays PLC) both fell more than 10 percent in particularly volatile trading which spurred intermittent automatic suspensions in trading.

Credit Suisse (>> Credit Suisse Group AG) shares hit another record low.

European banks have lost more than a third of their value this year.

(Reporting by Sudip Kar-Gupta; Editing by Vikram Subhedar)