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FDIC Indemnification Asset and True-up Payment Obligation (FDIC Indemnification Asset Roll Forward) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
FDIC Indemnification Asset [Roll Forward]        
Balance $ 0 $ 18,426,000 $ 14,411,000 $ 22,599,000
Shared-loss agreements reimbursements expected from the FDIC 0 (87,000) 0 (824,000)
Increase (decrease) in expected credit losses to be covered under shared-loss agreements, net 0 818,000 0 3,213,000
FDIC indemnification asset, expense 0 (1,910,000) (1,403,000) 6,179,000
Net (reimbursements) expenses incurred under shared-loss agreements 0 (577,000) 0 (2,139,000)
Balance 0 16,670,000 0 16,670,000
True-up payment obligation [Roll Forward]        
Balance 0 25,771,000 26,786,000 24,658,000
Change in true-up payment obligation expense 0 508,000 0 1,621,000
Shared-loss termination settlement, liability 0 0 (26,786,000) 0
Balance $ 0 $ 26,279,000 $ 0 $ 26,279,000