FDIC Shared-Loss Receivable (Changes in Receivable from FDIC) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Receivable From FDIC For Shared-Loss Agreements [Roll Forward]
Accretion of discounts and premiums, net	$ (421)	$ (1,017)	$ (1,443)	$ (4,259)
Receipt of payments from FDIC	2,243	3,199	7,440	16,701
Post-acquisition and other adjustments, net	(978)	(4,355)	(5,799)	(11,926)
Termination of FDIC shared-loss agreements	0	0	240	1,462
FDIC shared-loss receivable	$ 4,610	$ 3,108	$ 4,610	$ 3,108	$ 3,766	$ 4,172	$ 5,281	$ 4,054