FDIC Shared-Loss Receivable FDIC Shared-Loss Payable (Changes in Payable to FDIC) (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-Payable [Abstract]
FDIC shared-loss payable	$ 103,487	$ 99,126	$ 103,487	$ 99,126	$ 102,466	$ 101,342	$ 98,013	$ 97,008
Accretion expense	1,001	963	1,993	1,917
Adjustments related to changes in assumptions	$ 20	$ 150	$ 152	$ 201