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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, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
FDIC Indemnification Asset [Roll Forward]        
Balance $ 22,704 $ 143,660 $ 97,378 $ 189,240
Indemnification agreements reimbursements from FDIC 0 (12,837) (17,171) (31,537)
Shared-loss agreements reimbursements expected from the FDIC 0 0 (20,917) 0
Increase (decrease) in expected credit losses to be covered under shared-loss agreements, net 0 1,597 2,503 5,159
FDIC indemnification asset, expense 1,215 16,059 35,948 51,180
Incurred expenses to be reimbursed under shared-loss agreements 1,406 4,258 (2,950) 8,937
Balance 22,895 120,619 22,895 120,619
True-up payment obligation [Roll Forward]        
Balance 23,577 20,231 21,981 18,510
Change in true-up payment obligation expense 864 875 2,460 2,596
Balance $ 24,441 $ 21,106 $ 24,441 $ 21,106