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	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Reconciliation Of Carrying Amount Of Real Estate Investments Roll Forward
Balance at beginning of period	$ 77,177	$ 92,509
Additions	3,306	8,656
Disposals	(7,537)	(10,108)
Write-downs	(1,140)	(882)
Balance at end of period	71,806	90,175
Gain, net on the sale of other real estate included in ORE/Foreclosure expense	$ 1,812	$ 1,420