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FDIC Indemnification Asset, True-up Payment Obligation and FDIC shared-loss expense (FDIC Indemnification Asset Roll Forward) (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
FDIC Indemnification Asset [Roll Forward]    
Balance $ 22,599,000 $ 97,378,000
Indemnification agreements reimbursements from FDIC (406,000) (17,172,000)
Shared-loss agreements reimbursements expected from the FDIC 1,444,000 1,597,000
FDIC indemnification asset, expense 2,865,000 (12,221,000)
Incurred expenses to be reimbursed under shared-loss agreements 151,000 5,639,000
Balance 20,923,000 75,221,000
True-up payment obligation [Roll Forward]    
Balance 24,658,000 21,981,000
Change in true-up payment obligation expense 577,000 863,000
Balance $ 577,000 $ 22,844,000