Other Real Estate and Covered Other Real Estate - Changes and Losses, Net On Covered Other Real Estate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Covered Other Real Estate Roll Forward
Covered other real estate, beginning of period	$ 6,060	$ 5,108	$ 5,741
Transfers from covered loans	266	2,851	1,934
FASB ASC 310-30 adjustment for the residual recorded investment	(880)	136	(345)
Net transfers from covered loans	(614)	2,987	1,589
Disposals	(2,526)	(1,232)	(1,442)
Write-downs	(1,269)	(803)	(780)
Covered other real estate, end of period	1,651	6,060	5,108
Gain, net on the sale of covered other real estate included in ORE/Foreclosure expenses	$ 46	$ 24	$ 119