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FDIC Indemnification Asset and True-up Payment Obligation (FDIC Indemnification Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Fdic Shared Loss Expense [Abstract]    
FDIC indemnification asset, expense $ 0 $ 1,403
Change in true-up payment obligation expense 0 0
Final settlement with the FDIC on commercial loans 0 0
Shared-loss termination benefit 0 (15,814)
FDIC shared-loss expense, net $ 0 $ 1,403