Other Real Estate and Covered Other Real Estate (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014 Construction Land Development And Other Land Properties [Member]	Dec. 31, 2013 Construction Land Development And Other Land Properties [Member]	Mar. 31, 2014 1-4 Family Residential Properties [Member]	Dec. 31, 2013 1-4 Family Residential Properties [Member]	Mar. 31, 2014 Nonfarm, Nonresidential Properties [Member]	Dec. 31, 2013 Nonfarm, Nonresidential Properties [Member]	Mar. 31, 2013 BancTrust Financial Group, Inc. [Member]	Mar. 31, 2014 Construction, Land Development And Other Land Properties [Member]	Dec. 31, 2013 Construction, Land Development And Other Land Properties [Member]	Mar. 31, 2014 1 - 4 Family Residential Properties [Member]	Dec. 31, 2013 1 - 4 Family Residential Properties [Member]	Mar. 31, 2014 Nonfarm, Nonresidential Properties [Member]	Dec. 31, 2013 Nonfarm, Nonresidential Properties [Member]	Mar. 31, 2014 Other Real Estate Properties [Member]	Dec. 31, 2013 Other Real Estate Properties [Member]
Other real estate, excluding covered other real estate [Rollforward]
Balance at beginning of period	$ 106,539,000		$ 78,189,000									$ 68,216,000	$ 65,273,000	$ 13,994,000	$ 14,696,000	$ 29,152,000	$ 26,433,000	$ 174,000	$ 137,000
Additions	13,694,000	[1]	49,980,000	[1]
Disposals	(7,594,000)		(8,162,000)
Writedowns	(1,103,000)		(1,601,000)
Balance at end of period	111,536,000		118,406,000									68,216,000	65,273,000	13,994,000	14,696,000	29,152,000	26,433,000	174,000	137,000
Loss, net on the sale of other real estate included in ORE/Foreclosure expense	(415,000)		(15,000)
Other real estate, excluding covered other real estate [Line Items]
Total other real estate, excluding covered other real estate	111,536,000		118,406,000									68,216,000	65,273,000	13,994,000	14,696,000	29,152,000	26,433,000	174,000	137,000
Covered other real estate, beginning of period	5,108,000		5,741,000		725,000	733,000	1,586,000	1,981,000	2,448,000	2,394,000
Transfers from covered loans	98,000		947,000
FASB ASC 310-30 adjustment for the residual recorded investment	(52,000)		(246,000)
Net transfers from covered loans	46,000		701,000
Disposals	(315,000)		(203,000)
Writedowns	(80,000)		(360,000)
Covered other real estate, end of period	4,759,000		5,879,000		725,000	733,000	1,586,000	1,981,000	2,448,000	2,394,000
Loss, net on the sale of covered other real estate included in ORE/Foreclosure expense	(120,000)		(59,000)
Business Acquisition [Line Items]
Other real estate acquired											41,200,000
Schedule Of Covered Loans And Other Real Estate Acquired [Line Items]
Total covered other real estate	$ 4,759,000		$ 5,879,000		$ 725,000	$ 733,000	$ 1,586,000	$ 1,981,000	$ 2,448,000	$ 2,394,000

[1] Additions as of March 31, 2013 included $41.2 million of other real estate acquired from BancTrust on February 15, 2013.