Other Real Estate and Covered Other Real Estate (Details) (USD $)	6 Months Ended												6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013 Construction, Land Development And Other Land Properties [Member]	Dec. 31, 2012 Construction, Land Development And Other Land Properties [Member]	Jun. 30, 2013 1 - 4 Family Residential Properties [Member]	Dec. 31, 2012 1 - 4 Family Residential Properties [Member]	Jun. 30, 2013 Nonfarm, Nonresidential Properties [Member]	Dec. 31, 2012 Nonfarm, Nonresidential Properties [Member]	Jun. 30, 2013 Other Real Estate Properties [Member]	Dec. 31, 2012 Other Real Estate Properties [Member]	Jun. 30, 2013 BancTrust Financial Group, Inc. [Member]	Jun. 30, 2012 Bay Bank and Trust Company [Member]
Other Real Estate and Covered Other Real Estate [Abstract]
Loss, net on the sale of other real estate included in ORE/Foreclosure expense	$ (252,000)		$ (474,000)
Business Acquisition [Line Items]
Other real estate acquired	40,100,000		2,600,000										40,100,000	2,600,000
Other real estate, excluding covered other real estate [Rollforward]
Balance at beginning of period	78,189,000		79,053,000		62,762,000	46,957,000	12,489,000	8,134,000	39,861,000	22,760,000	2,600,000	338,000
Additions	60,511,000	[1]	16,605,000	[1]
Disposals	(16,564,000)		(17,895,000)
Writedowns	(4,424,000)		(4,090,000)
Balance at end of period	117,712,000		73,673,000		62,762,000	46,957,000	12,489,000	8,134,000	39,861,000	22,760,000	2,600,000	338,000
Total other real estate, excluding covered other real estate	$ 117,712,000		$ 73,673,000		$ 62,762,000	$ 46,957,000	$ 12,489,000	$ 8,134,000	$ 39,861,000	$ 22,760,000	$ 2,600,000	$ 338,000

[1] Includes $40.1 million of other real estate acquired from BancTrust at June 30, 2013, and $2.6 million of other real estate acquired from Bay Bank at June 30, 2012.