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FDIC Indemnification Asset and True-up Payment Obligation (FDIC Indemnification Asset Roll Forward) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
FDIC Indemnification Asset [Roll Forward]      
Balance $ 22,599 $ 97,378 $ 189,240
Shared-loss agreements reimbursements expected from the FDIC (1,573) (55,723) (47,666)
Increase (decrease) in expected credit losses to be covered under shared-loss agreements, net 3,391 2,503 5,836
FDIC indemnification asset, expense (8,040) (36,398) (62,285)
Final settlement with the FDIC on commercial loans 0 (1,589) 0
Net (reimbursements) expenses incurred under shared-loss agreements (1,966) 16,428 12,253
Balance 14,411 22,599 97,378
True-up payment obligation [Roll Forward]      
Balance 24,658 21,981 18,510
Change in true-up payment obligation expense 2,128 2,677 3,471
Balance $ 26,786 $ 24,658 $ 21,981