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FDIC Indemnification Asset and True-up Payment Obligation (FDIC Indemnification Asset Roll Forward) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
FDIC Indemnification Asset [Roll Forward]          
Balance $ 0 $ 20,923,000 $ 14,411,000 $ 22,599,000  
Shared-loss agreements reimbursements expected from the FDIC 0 (332,000) 0 (737,000)  
Increase (decrease) in expected credit losses to be covered under shared-loss agreements, net 0 951,000 0 2,395,000  
FDIC indemnification asset, expense 0 (1,405,000) (1,403,000) 4,269,000  
Final settlement with the FDIC on commercial loans 0 0 0 0  
Net (reimbursements) expenses incurred under shared-loss agreements 0 (1,711,000) 0 (1,562,000)  
Shared-loss termination settlement (15,814,000)   (15,814,000)   $ 0
Balance 0 18,426,000 0 18,426,000  
True-up payment obligation [Roll Forward]          
Balance 0 25,235,000 26,786,000 24,658,000  
Change in true-up payment obligation expense 0 537,000 0 1,114,000  
Shared-loss termination settlement, liability 0 0 (26,786,000) 0  
Balance $ 0 $ 25,772,000 $ 0 $ 25,772,000