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FDIC Shared-Loss Agreements (FDIC Indemnification Asset Roll Forward) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
FDIC Indemnification Asset [Roll Forward]      
Balance $ 0 $ 14,411 $ 22,599
Shared-loss agreements reimbursements expected from the FDIC 0 0 (1,573)
Increase (decrease) in expected credit losses to be covered under shared-loss agreements, net 0 0 3,391
FDIC indemnification asset, expense 0 1,403 (8,040)
Final settlement with the FDIC on commercial loans 0 0 0
Net (reimbursements) expenses incurred under shared-loss agreements 0 0 (1,966)
Shared-loss termination benefit 0 (15,814) 0
Balance 0 0 14,411
True-up payment obligation [Roll Forward]      
Balance 0 26,786 24,658
Change in true-up payment obligation expense 0 0 2,128
Shared-loss termination settlement, liability 0 (26,786) 0
Balance $ 0 $ 0 $ 26,786