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FDIC Indemnification Indemnification Asset and True-up Payment Obligation (Narrative) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
FDIC-Assisted Acquisition [Abstract]          
FDIC indemnification asset, expense $ 0   $ 1,405 $ 1,403 $ (4,269)
FDIC shared-loss expense, net $ 0   $ 3,420 (1,403) 7,449
(Repayment to) reimbursement to the FDIC for the termination of shared-loss agreements   $ 10,100   $ (10,125) $ 738