OTHER REAL ESTATE OWNED (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Activity in other real estate owned [Roll Forward]
Balance at beginning of period			$ 133,412,000	$ 59,265,000	$ 59,265,000
Additions to foreclosed properties
New foreclosed property			59,663,000	37,105,000	129,796,000
Reductions in foreclosed properties
Sales			(34,663,000)	(24,332,000)	(45,217,000)
Writedowns			(7,208,000)	(4,478,000)	(10,432,000)
Balance at end of period	151,204,000	67,560,000	151,204,000	67,560,000	133,412,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	151,204,000	67,560,000	151,204,000	67,560,000	133,412,000
Foreclosed property expenses [Abstract]
Total foreclosed property expenses	3,765,000	3,813,000	10,847,000	7,351,000
Realized net losses on dispositions and holding losses on valuations of foreclosed properties	2,100,000	3,200,000	7,600,000	5,900,000
Commercial and industrial segment [Member]
Reductions in foreclosed properties
Balance at end of period	1,403,000		1,403,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,403,000		1,403,000
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	18,000		18,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	18,000		18,000
Commercial and industrial segment [Member] | Mississippi [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] | 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		0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0		0
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
Real estate segment [Member] | Consumer mortgage [Member]
Reductions in foreclosed properties
Balance at end of period	19,954,000		19,954,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	19,954,000		19,954,000
Real estate segment [Member] | Consumer mortgage [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	3,985,000		3,985,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,985,000		3,985,000
Real estate segment [Member] | Consumer mortgage [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	327,000		327,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	327,000		327,000
Real estate segment [Member] | Consumer mortgage [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	3,391,000		3,391,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,391,000		3,391,000
Real estate segment [Member] | Consumer mortgage [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	762,000		762,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	762,000		762,000
Real estate segment [Member] | Consumer mortgage [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	6,078,000		6,078,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	6,078,000		6,078,000
Real estate segment [Member] | Consumer mortgage [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	2,642,000		2,642,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,642,000		2,642,000
Real estate segment [Member] | Consumer mortgage [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	1,120,000		1,120,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,120,000		1,120,000
Real estate segment [Member] | Consumer mortgage [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	1,649,000		1,649,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,649,000		1,649,000
Real estate segment [Member] | Home equity [Member]
Reductions in foreclosed properties
Balance at end of period	717,000		717,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	717,000		717,000
Real estate segment [Member] | 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
Real estate segment [Member] | Home equity [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	58,000		58,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	58,000		58,000
Real estate segment [Member] | Home equity [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	291,000		291,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	291,000		291,000
Real estate segment [Member] | 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
Real estate segment [Member] | 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
Real estate segment [Member] | Home equity [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	368,000		368,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	368,000		368,000
Real estate segment [Member] | Home equity [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
Real estate segment [Member] | 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
Real estate segment [Member] | Agricultural [Member]
Reductions in foreclosed properties
Balance at end of period	4,669,000		4,669,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,669,000		4,669,000
Real estate segment [Member] | Agricultural [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	950,000		950,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	950,000		950,000
Real estate segment [Member] | Agricultural [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	87,000		87,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	87,000		87,000
Real estate segment [Member] | Agricultural [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	2,081,000		2,081,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,081,000		2,081,000
Real estate segment [Member] | 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
Real estate segment [Member] | Agricultural [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	1,551,000		1,551,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,551,000		1,551,000
Real estate segment [Member] | Agricultural [Member] | Northeast Tennessee [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
Real estate segment [Member] | Agricultural [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
Real estate segment [Member] | 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
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties
Balance at end of period	7,339,000		7,339,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	7,339,000		7,339,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	930,000		930,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	930,000		930,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	109,000		109,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	109,000		109,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	1,740,000		1,740,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,740,000		1,740,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	79,000		79,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	79,000		79,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	3,515,000		3,515,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,515,000		3,515,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	446,000		446,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	446,000		446,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	228,000		228,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	228,000		228,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	292,000		292,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	292,000		292,000
Real estate segment [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties
Balance at end of period	108,352,000		108,352,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	108,352,000		108,352,000
Real estate segment [Member] | Construction, acquisition and development [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	9,334,000		9,334,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	9,334,000		9,334,000
Real estate segment [Member] | Construction, acquisition and development [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	2,231,000		2,231,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,231,000		2,231,000
Real estate segment [Member] | Construction, acquisition and development [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	26,052,000		26,052,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	26,052,000		26,052,000
Real estate segment [Member] | Construction, acquisition and development [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	2,952,000		2,952,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,952,000		2,952,000
Real estate segment [Member] | Construction, acquisition and development [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	49,562,000		49,562,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	49,562,000		49,562,000
Real estate segment [Member] | Construction, acquisition and development [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	14,931,000		14,931,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	14,931,000		14,931,000
Real estate segment [Member] | Construction, acquisition and development [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	2,669,000		2,669,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,669,000		2,669,000
Real estate segment [Member] | Construction, acquisition and development [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	621,000		621,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	621,000		621,000
Real estate segment [Member] | Commercial [Member]
Reductions in foreclosed properties
Balance at end of period	8,047,000		8,047,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	8,047,000		8,047,000
Real estate segment [Member] | Commercial [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	2,757,000		2,757,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,757,000		2,757,000
Real estate segment [Member] | Commercial [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	1,725,000		1,725,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,725,000		1,725,000
Real estate segment [Member] | Commercial [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	1,112,000		1,112,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,112,000		1,112,000
Real estate segment [Member] | 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
Real estate segment [Member] | Commercial [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	1,215,000		1,215,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,215,000		1,215,000
Real estate segment [Member] | Commercial [Member] | Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	203,000		203,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	203,000		203,000
Real estate segment [Member] | Commercial [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	584,000		584,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	584,000		584,000
Real estate segment [Member] | 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
All other receivables [Member]
Reductions in foreclosed properties
Balance at end of period	723,000		723,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	723,000		723,000
All other receivables [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	172,000		172,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	172,000		172,000
All other receivables [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	44,000		44,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	44,000		44,000
All other receivables [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	312,000		312,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	312,000		312,000
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	0		0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0		0
All other receivables [Member] | Northeast Tennessee [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] | 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
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
Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of period	18,567,000		18,567,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	18,567,000		18,567,000
Arkansas [Member]
Reductions in foreclosed properties
Balance at end of period	4,599,000		4,599,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,599,000		4,599,000
Mississippi [Member]
Reductions in foreclosed properties
Balance at end of period	34,979,000		34,979,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	34,979,000		34,979,000
Missouri [Member]
Reductions in foreclosed properties
Balance at end of period	4,439,000		4,439,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,439,000		4,439,000
Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of period	62,867,000		62,867,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	62,867,000		62,867,000
Northeast Tennessee [Member]
Reductions in foreclosed properties
Balance at end of period	18,590,000		18,590,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	18,590,000		18,590,000
Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of period	4,601,000		4,601,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,601,000		4,601,000
Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of period	2,562,000		2,562,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	$ 2,562,000		$ 2,562,000