Other Real Estate and Covered Other Real Estate - Other Real Estate, Excluding Covered Other Real Estate, By Type of Property (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate	$ 62,051	$ 77,177	$ 92,509	$ 106,539
Construction, Land Development And Other Land Properties [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate	36,871	47,550
1 - 4 Family Residential Properties [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate	7,926	10,732
Nonfarm, Nonresidential Properties [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate	16,817	16,717
Other Real Estate Properties [Member]
Other real estate, excluding covered other real estate [Line Items]
Other real estate, excluding covered other real estate	$ 437	$ 2,178