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FDIC Indemnification Asset and True-up Payment Obligation (FDIC Indemnification Asset Roll Forward) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
FDIC Indemnification Asset [Roll Forward]        
Balance $ 18,426 $ 22,704 $ 22,599 $ 97,378
Indemnification agreements reimbursements from FDIC (87) 0 (824) (17,171)
Shared-loss agreements reimbursements expected from the FDIC 0 0 0 (20,917)
Increase (decrease) in expected credit losses to be covered under shared-loss agreements, net 818 0 3,213 2,503
Incurred expenses to be reimbursed under shared-loss agreements (577) 1,406 (2,139) (2,950)
FDIC indemnification asset, expense (1,910) (1,215) (6,179) (35,948)
Balance 16,670 22,895 16,670 22,895
True-up payment obligation [Roll Forward]        
Balance 25,771 23,577 24,658 21,981
Change in true-up payment obligation expense 508 864 1,621 2,460
Balance $ 26,279 $ 24,441 $ 26,279 $ 24,441