FDIC Shared-Loss Receivable (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
FDIC Shared-Loss Receivable [Abstract]
Net payment to the FDIC for termination of shared-loss agreements			$ 0	$ 285
Loss on termination of FDIC share-loss agreements			0	(45)
FDIC shared-loss payable	$ 103,487	$ 99,126	103,487	99,126	$ 102,466	$ 101,342	$ 98,013	$ 97,008
Net Impact from FDIC shared-loss termination	0	$ 0	0	$ (45)
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$ 62,100		$ 62,100