OTHER REAL ESTATE OWNED (Details) (USD $)	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010	Dec. 31, 2009
Activity in other real estate owned [Roll Forward]
Balance at beginning of year	$ 133,412,000		$ 59,265,000
Additions to foreclosed properties
New foreclosed properties	125,234,000		129,796,000
Reductions in foreclosed properties
Sales	(64,488,000)		(45,217,000)
Writedowns	(20,353,000)		(10,432,000)
Balance at end of year	173,805,000		133,412,000	59,265,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	173,805,000		133,412,000	59,265,000
Foreclosed property expenses [Abstract]
Total foreclosed property expenses	27,796,000		18,355,000	13,599,000
Realized net losses on dispositions and holding losses on valuations of foreclosed properties	21,400,000		14,200,000	10,800,000
Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of year	26,888,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	26,888,000
Arkansas [Member]
Reductions in foreclosed properties
Balance at end of year	4,697,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,697,000	[1]
Mississippi [Member]
Reductions in foreclosed properties
Balance at end of year	28,372,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	28,372,000	[1]
Missouri [Member]
Reductions in foreclosed properties
Balance at end of year	2,243,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,243,000
Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of year	92,504,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	92,504,000
Tennessee [Member]
Reductions in foreclosed properties
Balance at end of year	12,257,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	12,257,000	[1]
Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of year	3,955,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,955,000
Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of year	2,889,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,889,000
Commercial and industrial segment [Member]
Reductions in foreclosed properties
Balance at end of year	1,393,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,393,000
Commercial and industrial segment [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of year	436,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	436,000
Commercial and industrial segment [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of year	17,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	17,000	[1]
Commercial and industrial segment [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of year	0	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[1]
Commercial and industrial segment [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Commercial and industrial segment [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of year	940,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	940,000
Commercial and industrial segment [Member] | Tennessee [Member]
Reductions in foreclosed properties
Balance at end of year	0	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[1]
Commercial and industrial segment [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Commercial and industrial segment [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties
Balance at end of year	20,645,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	20,645,000
Real estate segment [Member] | Home equity [Member]
Reductions in foreclosed properties
Balance at end of year	651,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	651,000
Real estate segment [Member] | Agricultural [Member]
Reductions in foreclosed properties
Balance at end of year	5,716,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	5,716,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties
Balance at end of year	6,344,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	6,344,000
Real estate segment [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties
Balance at end of year	121,886,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	121,886,000
Real estate segment [Member] | Commercial [Member]
Reductions in foreclosed properties
Balance at end of year	14,987,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	14,987,000
Real estate segment [Member] | Alabama and Florida Panhandle [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties
Balance at end of year	3,816,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,816,000
Real estate segment [Member] | Alabama and Florida Panhandle [Member] | Home equity [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Alabama and Florida Panhandle [Member] | Agricultural [Member]
Reductions in foreclosed properties
Balance at end of year	899,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	899,000
Real estate segment [Member] | Alabama and Florida Panhandle [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties
Balance at end of year	1,022,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,022,000
Real estate segment [Member] | Alabama and Florida Panhandle [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties
Balance at end of year	19,318,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	19,318,000
Real estate segment [Member] | Alabama and Florida Panhandle [Member] | Commercial [Member]
Reductions in foreclosed properties
Balance at end of year	1,121,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,121,000
Real estate segment [Member] | Arkansas [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties
Balance at end of year	448,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	448,000	[1]
Real estate segment [Member] | Arkansas [Member] | Home equity [Member]
Reductions in foreclosed properties
Balance at end of year	0	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[1]
Real estate segment [Member] | Arkansas [Member] | Agricultural [Member]
Reductions in foreclosed properties
Balance at end of year	0	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[1]
Real estate segment [Member] | Arkansas [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties
Balance at end of year	303,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	303,000	[1]
Real estate segment [Member] | Arkansas [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties
Balance at end of year	2,241,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,241,000	[1]
Real estate segment [Member] | Arkansas [Member] | Commercial [Member]
Reductions in foreclosed properties
Balance at end of year	1,605,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,605,000	[1]
Real estate segment [Member] | Mississippi [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties
Balance at end of year	3,400,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,400,000	[1]
Real estate segment [Member] | Mississippi [Member] | Home equity [Member]
Reductions in foreclosed properties
Balance at end of year	51,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	51,000	[1]
Real estate segment [Member] | Mississippi [Member] | Agricultural [Member]
Reductions in foreclosed properties
Balance at end of year	275,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	275,000	[1]
Real estate segment [Member] | Mississippi [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties
Balance at end of year	1,972,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,972,000	[1]
Real estate segment [Member] | Mississippi [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties
Balance at end of year	18,850,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	18,850,000	[1]
Real estate segment [Member] | Mississippi [Member] | Commercial [Member]
Reductions in foreclosed properties
Balance at end of year	3,604,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,604,000	[1]
Real estate segment [Member] | Missouri [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Missouri [Member] | Home equity [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Missouri [Member] | Agricultural [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Missouri [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties
Balance at end of year	76,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	76,000
Real estate segment [Member] | Missouri [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties
Balance at end of year	1,974,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,974,000
Real estate segment [Member] | Missouri [Member] | Commercial [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Greater Memphis Area [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties
Balance at end of year	5,199,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	5,199,000
Real estate segment [Member] | Greater Memphis Area [Member] | Home equity [Member]
Reductions in foreclosed properties
Balance at end of year	600,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	600,000
Real estate segment [Member] | Greater Memphis Area [Member] | Agricultural [Member]
Reductions in foreclosed properties
Balance at end of year	4,542,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,542,000
Real estate segment [Member] | Greater Memphis Area [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties
Balance at end of year	2,371,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,371,000
Real estate segment [Member] | Greater Memphis Area [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties
Balance at end of year	69,822,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	69,822,000
Real estate segment [Member] | Greater Memphis Area [Member] | Commercial [Member]
Reductions in foreclosed properties
Balance at end of year	7,672,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	7,672,000
Real estate segment [Member] | Tennessee [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties
Balance at end of year	4,160,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,160,000	[1]
Real estate segment [Member] | Tennessee [Member] | Home equity [Member]
Reductions in foreclosed properties
Balance at end of year	0	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[1]
Real estate segment [Member] | Tennessee [Member] | Agricultural [Member]
Reductions in foreclosed properties
Balance at end of year	0	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[1]
Real estate segment [Member] | Tennessee [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties
Balance at end of year	426,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	426,000	[1]
Real estate segment [Member] | Tennessee [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties
Balance at end of year	6,918,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	6,918,000	[1]
Real estate segment [Member] | Tennessee [Member] | Commercial [Member]
Reductions in foreclosed properties
Balance at end of year	753,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	753,000	[1]
Real estate segment [Member] | Texas and Louisiana [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties
Balance at end of year	733,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	733,000
Real estate segment [Member] | Texas and Louisiana [Member] | Home equity [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Texas and Louisiana [Member] | Agricultural [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Texas and Louisiana [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties
Balance at end of year	174,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	174,000
Real estate segment [Member] | Texas and Louisiana [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties
Balance at end of year	2,763,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,763,000
Real estate segment [Member] | Texas and Louisiana [Member] | Commercial [Member]
Reductions in foreclosed properties
Balance at end of year	232,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	232,000
Real estate segment [Member] | Other Geographical Areas [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties
Balance at end of year	2,889,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,889,000
Real estate segment [Member] | Other Geographical Areas [Member] | Home equity [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Other Geographical Areas [Member] | Agricultural [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Other Geographical Areas [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Other Geographical Areas [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Other Geographical Areas [Member] | Commercial [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
All other receivables [Member]
Reductions in foreclosed properties
Balance at end of year	2,183,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,183,000
All other receivables [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties
Balance at end of year	276,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	276,000
All other receivables [Member] | Arkansas [Member]
Reductions in foreclosed properties
Balance at end of year	83,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	83,000	[1]
All other receivables [Member] | Mississippi [Member]
Reductions in foreclosed properties
Balance at end of year	220,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	220,000	[1]
All other receivables [Member] | Missouri [Member]
Reductions in foreclosed properties
Balance at end of year	193,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	193,000
All other receivables [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties
Balance at end of year	1,358,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,358,000
All other receivables [Member] | Tennessee [Member]
Reductions in foreclosed properties
Balance at end of year	0	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	0	[1]
All other receivables [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties
Balance at end of year	53,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	53,000
All other receivables [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	$ 0

[1] Excludes the Greater Memphis Area.