Other Real Estate and Covered Other Real Estate - Changes and Gains, Net on Other Real Estate, Excluding Covered Other Real Estate (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward
Balance at beginning of period		$ 77,177	$ 92,509	$ 106,539
Additions	[1]	24,348	33,396	37,428
Disposals		(35,075)	(45,826)	(43,802)
Write-downs		(4,399)	(2,902)	(7,656)
Balance at end of period		62,051	77,177	92,509
Gain, net on the sale of other real estate included in other real estate expense		$ 6,151	$ 3,995	$ 3,697

[1] For the year ended December 31, 2016, additions to other real estate included $388 thousand of other real estate transferred from covered other real estate as a result of the expiration of the related loss share agreement with the FDIC on June 30, 2016.