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	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward
Balance at beginning of period	$ 77,177	$ 92,509
Additions	21,972	26,832
Disposals	(30,494)	(33,015)
Write-downs	(3,662)	(2,371)
Balance at end of period	64,993	83,955
Gain, net on the sale of other real estate included in other real estate expense	$ 5,350	$ 2,116