OTHER REAL ESTATE OWNED (Details) (USD $)	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2011		Sep. 30, 2010	Sep. 30, 2011		Sep. 30, 2010	Dec. 31, 2010
Activity in other real estate owned [Roll Forward]
Balance at beginning of period				$ 133,412,000	[1]	$ 59,265,000	$ 59,265,000
Additions to foreclosed properties
New foreclosed properties				88,726,000		67,113,000	129,796,000
Reductions in foreclosed properties
Sales				(47,799,000)		(36,688,000)	(45,217,000)
Writedowns				(11,653,000)		(7,043,000)	(10,432,000)
Balance at end of period	162,686,000		82,647,000	162,686,000		82,647,000	133,412,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	162,686,000		82,647,000	162,686,000		82,647,000	133,412,000	[1]
Foreclosed property expenses [Abstract]
Total foreclosed property expenses	6,116,000		4,912,000	16,963,000		12,263,000
Realized net losses on dispositions and holding losses on valuations of foreclosed properties	4,500,000		4,100,000	12,000,000		10,000,000
Commercial and industrial segment [Member]
Reductions in foreclosed properties
Balance at end of period	1,402,000			1,402,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,402,000			1,402,000
Commercial and industrial segment [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	439,000			439,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	439,000			439,000
Commercial and industrial segment [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	17,000	[2]		17,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	17,000	[2]		17,000	[2]
Commercial and industrial segment [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	0	[2]		0	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[2]		0	[2]
Commercial and industrial segment [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Commercial and industrial segment [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	946,000			946,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	946,000			946,000
Commercial and industrial segment [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	0	[2]		0	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[2]		0	[2]
Commercial and industrial segment [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Commercial and industrial segment [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
All other receivables [Member]
Reductions in foreclosed properties
Balance at end of period	2,659,000			2,659,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,659,000			2,659,000
All other receivables [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	68,000			68,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	68,000			68,000
All other receivables [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	87,000	[2]		87,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	87,000	[2]		87,000	[2]
All other receivables [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	276,000	[2]		276,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	276,000	[2]		276,000	[2]
All other receivables [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	195,000			195,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	195,000			195,000
All other receivables [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	1,980,000			1,980,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,980,000			1,980,000
All other receivables [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	0	[2]		0	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[2]		0	[2]
All other receivables [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	53,000			53,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	53,000			53,000
All other receivables [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Consumer mortgages [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	5,368,000			5,368,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	5,368,000			5,368,000
Home equity [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Agricultural [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	951,000			951,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	951,000			951,000
Commercial and industrial-owner occupied [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	1,093,000			1,093,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,093,000			1,093,000
Construction, acquisition and development [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	11,355,000			11,355,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	11,355,000			11,355,000
Commercial [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	2,939,000			2,939,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,939,000			2,939,000
Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	22,213,000			22,213,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	22,213,000			22,213,000
Consumer mortgages [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	475,000	[2]		475,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	475,000	[2]		475,000	[2]
Home equity [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	63,000	[2]		63,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	63,000	[2]		63,000	[2]
Agricultural [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	0	[2]		0	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[2]		0	[2]
Commercial and industrial-owner occupied [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	109,000	[2]		109,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	109,000	[2]		109,000	[2]
Construction, acquisition and development [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	2,384,000	[2]		2,384,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,384,000	[2]		2,384,000	[2]
Commercial [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	1,631,000	[2]		1,631,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,631,000	[2]		1,631,000	[2]
Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	4,766,000	[2]		4,766,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,766,000	[2]		4,766,000	[2]
Consumer mortgages [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	3,533,000	[2]		3,533,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,533,000	[2]		3,533,000	[2]
Home equity [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	155,000	[2]		155,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	155,000	[2]		155,000	[2]
Agricultural [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	968,000	[2]		968,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	968,000	[2]		968,000	[2]
Commercial and industrial-owner occupied [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	2,216,000	[2]		2,216,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,216,000	[2]		2,216,000	[2]
Construction, acquisition and development [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	18,890,000	[2]		18,890,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	18,890,000	[2]		18,890,000	[2]
Commercial [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	1,266,000	[2]		1,266,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,266,000	[2]		1,266,000	[2]
Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	27,304,000	[2]		27,304,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	27,304,000	[2]		27,304,000	[2]
Consumer mortgages [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Home equity [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Agricultural [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Commercial and industrial-owner occupied [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	77,000			77,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	77,000			77,000
Construction, acquisition and development [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	2,706,000			2,706,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,706,000			2,706,000
Commercial [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	451,000			451,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	451,000			451,000
Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	3,429,000			3,429,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,429,000			3,429,000
Consumer mortgages [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	5,259,000			5,259,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	5,259,000			5,259,000
Home equity [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Agricultural [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	4,233,000			4,233,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,233,000			4,233,000
Commercial and industrial-owner occupied [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	3,225,000			3,225,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,225,000			3,225,000
Construction, acquisition and development [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	70,189,000			70,189,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	70,189,000			70,189,000
Commercial [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	2,601,000			2,601,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,601,000			2,601,000
Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	88,433,000			88,433,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	88,433,000			88,433,000
Consumer mortgages [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	2,090,000	[2]		2,090,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,090,000	[2]		2,090,000	[2]
Home equity [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	368,000	[2]		368,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	368,000	[2]		368,000	[2]
Agricultural [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	0	[2]		0	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[2]		0	[2]
Commercial and industrial-owner occupied [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	525,000	[2]		525,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	525,000	[2]		525,000	[2]
Construction, acquisition and development [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	6,072,000	[2]		6,072,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	6,072,000	[2]		6,072,000	[2]
Commercial [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	848,000	[2]		848,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	848,000	[2]		848,000	[2]
Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	9,903,000	[2]		9,903,000	[2]
Other real estate owned by geographical location, segment and class [Abstract]
Total	9,903,000	[2]		9,903,000	[2]
Consumer mortgages [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	821,000			821,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	821,000			821,000
Home equity [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	100,000			100,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	100,000			100,000
Agricultural [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	78,000			78,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	78,000			78,000
Commercial and industrial-owner occupied [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	378,000			378,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	378,000			378,000
Construction, acquisition and development [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	2,998,000			2,998,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,998,000			2,998,000
Commercial [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	234,000			234,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	234,000			234,000
Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	4,662,000			4,662,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,662,000			4,662,000
Consumer mortgages [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	1,976,000			1,976,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,976,000			1,976,000
Home equity [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Agricultural [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Commercial and industrial-owner occupied [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Construction, acquisition and development [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Commercial [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	0			0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0			0
Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	1,976,000			1,976,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,976,000			1,976,000
Agricultural [Member]
Reductions in foreclosed properties
Balance at end of period	6,230,000			6,230,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	6,230,000			6,230,000
Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties
Balance at end of period	7,623,000			7,623,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	7,623,000			7,623,000
Consumer mortgages [Member]
Reductions in foreclosed properties
Balance at end of period	19,522,000			19,522,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	19,522,000			19,522,000
Construction, acquisition and development [Member]
Reductions in foreclosed properties
Balance at end of period	114,594,000			114,594,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	114,594,000			114,594,000
Commercial [Member]
Reductions in foreclosed properties
Balance at end of period	9,970,000			9,970,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	9,970,000			9,970,000
Home equity [Member]
Reductions in foreclosed properties
Balance at end of period	686,000			686,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	$ 686,000			$ 686,000

[1] Derived from audited financial statements.

[2] excludes the Greater Memphis Area