OTHER REAL ESTATE OWNED (Details) (USD $)	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Activity in other real estate owned [Roll Forward]
Balance at beginning of year	$ 173,805,000		$ 133,412,000
Additions to foreclosed properties [Abstract]
New foreclosed properties	32,389,000		125,234,000
Reductions in foreclosed properties [Abstract]
Sales	(81,220,000)		(64,488,000)
Writedowns	(21,726,000)		(20,353,000)
Balance at end of year	103,248,000		173,805,000	133,412,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	103,248,000		173,805,000	133,412,000
Foreclosed property expenses [Abstract]
Total foreclosed property expenses	39,406,000		27,796,000	18,355,000
Realized net losses on dispositions and holding losses on valuations of foreclosed properties	30,200,000		21,400,000	14,200,000
Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	17,254,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	17,254,000
Arkansas [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	3,185,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,185,000	[1]
Mississippi [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	19,916,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	19,916,000	[1]
Missouri [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	1,089,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,089,000
Greater Memphis Area [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	41,950,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	41,950,000
Tennessee [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	12,482,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	12,482,000	[1]
Texas and Louisiana [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	3,227,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,227,000
Other Geographical Areas [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	4,145,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,145,000
Commercial and industrial segment [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	501,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	501,000
Commercial and industrial segment [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	395,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	395,000
Commercial and industrial segment [Member] | Arkansas [Member]
Reductions in foreclosed properties [Abstract]
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] | Mississippi [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	106,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	106,000	[1]
Commercial and industrial segment [Member] | Missouri [Member]
Reductions in foreclosed properties [Abstract]
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 [Abstract]
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Commercial and industrial segment [Member] | Tennessee [Member]
Reductions in foreclosed properties [Abstract]
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 [Abstract]
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 [Abstract]
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 [Abstract]
Balance at end of year	10,117,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	10,117,000
Real estate segment [Member] | Home equity [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	0
Other real estate owned by geographical location, segment and class [Abstract]
Total	0
Real estate segment [Member] | Agricultural [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	4,425,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,425,000
Real estate segment [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	4,745,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	4,745,000
Real estate segment [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	78,977,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	78,977,000
Real estate segment [Member] | Commercial Real Estate [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	3,235,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,235,000
Real estate segment [Member] | Alabama and Florida Panhandle [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	1,714,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,714,000
Real estate segment [Member] | Alabama and Florida Panhandle [Member] | Home equity [Member]
Reductions in foreclosed properties [Abstract]
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 [Abstract]
Balance at end of year	856,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	856,000
Real estate segment [Member] | Alabama and Florida Panhandle [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	155,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	155,000
Real estate segment [Member] | Alabama and Florida Panhandle [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	13,610,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	13,610,000
Real estate segment [Member] | Alabama and Florida Panhandle [Member] | Commercial Real Estate [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	478,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	478,000
Real estate segment [Member] | Arkansas [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	173,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	173,000	[1]
Real estate segment [Member] | Arkansas [Member] | Home equity [Member]
Reductions in foreclosed properties [Abstract]
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 [Abstract]
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 [Abstract]
Balance at end of year	146,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	146,000	[1]
Real estate segment [Member] | Arkansas [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	1,430,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,430,000	[1]
Real estate segment [Member] | Arkansas [Member] | Commercial Real Estate [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	1,420,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,420,000	[1]
Real estate segment [Member] | Mississippi [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	2,220,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,220,000	[1]
Real estate segment [Member] | Mississippi [Member] | Home equity [Member]
Reductions in foreclosed properties [Abstract]
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] | Mississippi [Member] | Agricultural [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	99,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	99,000	[1]
Real estate segment [Member] | Mississippi [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	1,602,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,602,000	[1]
Real estate segment [Member] | Mississippi [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	15,659,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	15,659,000	[1]
Real estate segment [Member] | Mississippi [Member] | Commercial Real Estate [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	3,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,000	[1]
Real estate segment [Member] | Missouri [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties [Abstract]
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 [Abstract]
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 [Abstract]
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 [Abstract]
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] | Construction, acquisition and development [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	734,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	734,000
Real estate segment [Member] | Missouri [Member] | Commercial Real Estate [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	263,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	263,000
Real estate segment [Member] | Greater Memphis Area [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	961,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	961,000
Real estate segment [Member] | Greater Memphis Area [Member] | Home equity [Member]
Reductions in foreclosed properties [Abstract]
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] | Agricultural [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	1,089,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,089,000
Real estate segment [Member] | Greater Memphis Area [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	2,630,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,630,000
Real estate segment [Member] | Greater Memphis Area [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	35,717,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	35,717,000
Real estate segment [Member] | Greater Memphis Area [Member] | Commercial Real Estate [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	819,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	819,000
Real estate segment [Member] | Tennessee [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	624,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	624,000	[1]
Real estate segment [Member] | Tennessee [Member] | Home equity [Member]
Reductions in foreclosed properties [Abstract]
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 [Abstract]
Balance at end of year	2,169,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	2,169,000	[1]
Real estate segment [Member] | Tennessee [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	66,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	66,000	[1]
Real estate segment [Member] | Tennessee [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	9,535,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	9,535,000	[1]
Real estate segment [Member] | Tennessee [Member] | Commercial Real Estate [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	76,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	76,000	[1]
Real estate segment [Member] | Texas and Louisiana [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	760,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	760,000
Real estate segment [Member] | Texas and Louisiana [Member] | Home equity [Member]
Reductions in foreclosed properties [Abstract]
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 [Abstract]
Balance at end of year	212,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	212,000
Real estate segment [Member] | Texas and Louisiana [Member] | Commercial and industrial-owner occupied [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	146,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	146,000
Real estate segment [Member] | Texas and Louisiana [Member] | Construction, acquisition and development [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	1,844,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,844,000
Real estate segment [Member] | Texas and Louisiana [Member] | Commercial Real Estate [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	176,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	176,000
Real estate segment [Member] | Other Geographical Areas [Member] | Consumer mortgages [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	3,665,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	3,665,000
Real estate segment [Member] | Other Geographical Areas [Member] | Home equity [Member]
Reductions in foreclosed properties [Abstract]
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 [Abstract]
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 [Abstract]
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 [Abstract]
Balance at end of year	448,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	448,000
Real estate segment [Member] | Other Geographical Areas [Member] | Commercial Real Estate [Member]
Reductions in foreclosed properties [Abstract]
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 [Abstract]
Balance at end of year	1,248,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	1,248,000
All other receivables [Member] | Alabama and Florida Panhandle [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	46,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	46,000
All other receivables [Member] | Arkansas [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	16,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	16,000	[1]
All other receivables [Member] | Mississippi [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	227,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	227,000	[1]
All other receivables [Member] | Missouri [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	92,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	92,000
All other receivables [Member] | Greater Memphis Area [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	734,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	734,000
All other receivables [Member] | Tennessee [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	12,000	[1]
Other real estate owned by geographical location, segment and class [Abstract]
Total	12,000	[1]
All other receivables [Member] | Texas and Louisiana [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	89,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	89,000
All other receivables [Member] | Other Geographical Areas [Member]
Reductions in foreclosed properties [Abstract]
Balance at end of year	32,000
Other real estate owned by geographical location, segment and class [Abstract]
Total	$ 32,000

[1] Excludes the Greater Memphis Area