Other Real Estate and Covered Other Real Estate (Details) (USD $)	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Mar. 31, 2012 Construction Land Development And Other Land Properties [Member]	Dec. 31, 2011 Construction Land Development And Other Land Properties [Member]	Mar. 31, 2012 Residential 1-4 Family Properties [Member]	Dec. 31, 2011 Residential 1-4 Family Properties [Member]	Mar. 31, 2012 Nonresidential Nonfarm Properties [Member]	Dec. 31, 2011 Nonresidential Nonfarm Properties [Member]	Mar. 31, 2012 Other Real Estate Properties [Member]	Dec. 31, 2011 Other Real Estate Properties [Member]	Apr. 15, 2011 Heritage Banking Group Business Acquisition [Member]	Mar. 31, 2012 Florida [Member]	Dec. 31, 2011 Florida [Member]	Mar. 31, 2012 Mississippi [Member]		Dec. 31, 2011 Mississippi [Member]		Mar. 31, 2012 Tennessee [Member]		Dec. 31, 2011 Tennessee [Member]		Mar. 31, 2012 Texas [Member]	Dec. 31, 2011 Texas [Member]	Mar. 31, 2012 Construction, land development and other land loans [Member]	Dec. 31, 2011 Construction, land development and other land loans [Member]	Mar. 31, 2012 1 - 4 Family residential properties [Member]	Dec. 31, 2011 1 - 4 Family residential properties [Member]	Mar. 31, 2012 Nonfarm, nonresidential properties [Member]	Dec. 31, 2011 Nonfarm, nonresidential properties [Member]	Mar. 31, 2012 Other real estate properties [Member]	Dec. 31, 2011 Other real estate properties [Member]
Non-covered other real estate [Rollforward]
Balance at beginning of period	$ 79,053,000	$ 86,704,000										$ 26,226,000	$ 29,963,000	$ 19,240,000	[1]	$ 19,483,000	[1]	$ 17,665,000	[2]	$ 16,879,000	[2]	$ 12,611,000	$ 12,728,000	$ 48,083,000	$ 53,834,000	$ 10,715,000	$ 10,557,000	$ 16,463,000	$ 13,883,000	$ 481,000	$ 779,000
Additions	8,864,000	19,552,000
Disposals	(9,767,000)	(15,055,000)
Writedowns	(2,408,000)	(2,003,000)
Balance at end of period	75,742,000	89,198,000										26,226,000	29,963,000	19,240,000	[1]	19,483,000	[1]	17,665,000	[2]	16,879,000	[2]	12,611,000	12,728,000	48,083,000	53,834,000	10,715,000	10,557,000	16,463,000	13,883,000	481,000	779,000
Gain (Loss), net on the sale of noncovered other real estate included in other expenses	(416,000)	344,000
Other non-covered real estate [Line Items]
Total other real estate, excluding covered other real estate	75,742,000	89,198,000										26,226,000	29,963,000	19,240,000	[1]	19,483,000	[1]	17,665,000	[2]	16,879,000	[2]	12,611,000	12,728,000	48,083,000	53,834,000	10,715,000	10,557,000	16,463,000	13,883,000	481,000	779,000
Other non-covered real estate by geographic location [Line Items]
Total other real estate, excluding covered other real estate	75,742,000	89,198,000										26,226,000	29,963,000	19,240,000	[1]	19,483,000	[1]	17,665,000	[2]	16,879,000	[2]	12,611,000	12,728,000	48,083,000	53,834,000	10,715,000	10,557,000	16,463,000	13,883,000	481,000	779,000
Covered other real estate, beginning of period	6,331,000		1,423,000	1,304,000	574,000	889,000	3,711,000	4,022,000	116,000	116,000
Transfers from covered loans	144,000
FASB ASC 310-30 adjustment for the residual recorded investment	(10,000)
Net transfers from covered loans	134,000
Disposals	(518,000)
Writedowns	(123,000)
Covered other real estate, end of period	5,824,000		1,423,000	1,304,000	574,000	889,000	3,711,000	4,022,000	116,000	116,000
Gain (loss), net on the sale of covered other real estate included in ORE/Foreclosure expenses	158,000
Business Acquisition [Line Items]
Business acquisition, covered other real estate acquired											7,500,000
Schedule Of Covered Loans And Other Real Estate Acquired [Line Items]
Total covered other real estate	$ 5,824,000		$ 1,423,000	$ 1,304,000	$ 574,000	$ 889,000	$ 3,711,000	$ 4,022,000	$ 116,000	$ 116,000

[1] (1) - Mississippi includes Central and Southern Mississippi Region

[2] 2) - Tennessee includes Memphis, Tennessee and Northern Mississippi Region