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FDIC Indemnification Asset and True-up Payment Obligation and FDIC shared-loss expense (FDIC Indemnification Asset Roll Forward) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
FDIC Indemnification Asset [Roll Forward]      
Balance $ 97,378,000 $ 189,240,000 $ 302,295,000
Indemnification agreements reimbursements from FDIC (55,723,000) (47,666,000) (47,100,000)
FDIC indemnification asset, expense 36,398,000 62,285,000 66,253,000
Final settlement with the FDIC on commercial loans 1,589,000 0 0
Incurred expenses to be reimbursed under shared-loss agreements 16,428,000 12,253,000 7,028,000
Balance 22,599,000 97,378,000 189,240,000
True-up payment obligation [Roll Forward]      
Balance 21,981,000 18,510,000 15,496,000
Change in true-up payment obligation expense 2,677,000 3,471,000 3,014,000
Balance $ 2,677,000 $ 21,981,000 $ 18,510,000