FDIC Shared-Loss Receivable and Payable (Changes in Receivable from FDIC) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
FDIC Shared-Loss Receivable [Abstract]
Cash Paid To FDIC For Termination Of Loss Share Agreements	$ 300
FDIC Indemnification Asset [Roll Forward]
Beginning balance	4,172	$ 4,054	$ 28,701
Accretion of discounts and premiums, net	(1,865)	(4,734)	(10,899)
Receipt of payments from FDIC	7,440	21,059	33,296
Post-acquisition and other adjustments, net	(7,764)	(14,745)	(47,044)
FDIC Indemnification Asset, Disposals	240	1,462	0
Ending balance	2,223	4,172	4,054
Gain (Loss) on Contract Termination	(45)	(3,377)	0
FDIC shared-loss payable	101,342	97,008
Net impact from FDIC shared-loss termination	45	(16,559)	$ 0
Loans and Leases Receivable, Gross, Carrying Amount, Covered	$ 67,800	$ 84,800