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FDIC Indemnification Indemnification Asset and True-up Payment Obligation (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
FDIC-Assisted Acquisition [Abstract]    
FDIC indemnification asset, expense $ 0 $ (1,403)
(Repayment to) reimbursement to the FDIC for the termination of shared-loss agreements $ 0 $ (10,125)