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FDIC Shared-Loss Agreements (FDIC Indemnification Asset Roll Forward) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
F D I C Indemnification Asset [Roll Forward]      
Balance $ 0 $ 0 $ 14,411
FDIC indemnification asset, benefit 0 0 1,403
Shared-loss termination settlement 0 0 (15,814)
Balance 0 0 0
Tru-up payment obligation [Roll Forward]      
Balance 0 0 26,786
Change in true-up payment obligation expense 0 0 0
Shared-loss termination settlement, liability 0 0 (26,786)
Balance $ 0 $ 0 $ 0