Other Real Estate and Covered Other Real Estate - Covered Other Real Estate by Type of Property (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015	Dec. 31, 2014
Other real estate, covered other real estate [Line Items]
Total covered other real estate	$ 496	$ 1,651	$ 4,794	$ 6,060
Construction, Land Development and Other Land [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	62	638
Secured by 1-4 Family Residential Properties [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	183	223
Loans secured by Nonfarm, Nonresidential Properties [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	251	399
Other Real Estate Secured [Member]
Other real estate, covered other real estate [Line Items]
Total covered other real estate	$ 0	$ 391