Other Real Estate and Covered Other Real Estate - Covered Other Real Estate by Type of Property (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Other real estate, covered other real estate [Line Items]
Total covered other real estate	$ 0	$ 1,651	$ 2,865	$ 6,060
Construction, Land Development and Other Land [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	0	638
Secured by 1-4 Family Residential Properties [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	0	223
Loans secured by Nonfarm, Nonresidential Properties [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	0	399
Other Real Estate Secured [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	$ 0	$ 391