Other Real Estate excluding Covered Other Real Estate (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011		Dec. 31, 2010		Dec. 31, 2009
Non-covered other real estate [Rollforward]
Balance at beginning of period	$ 86,704		$ 90,095		$ 38,566
Additions	56,929		61,786		78,300
Disposals	(50,724)		(48,050)		(19,332)
Writedowns	(13,856)		(17,127)		(7,439)
Balance at end of period	79,053		86,704		90,095
Gain (Loss), net on the sale of noncovered other real estate included in other expenses	1,605		(31)		(1,042)
Other non-covered real estate [Line Items]
Total other real estate, excluding covered other real estate	79,053		86,704		90,095
Other non-covered real estate by geographic location [Line Items]
Total other real estate, excluding covered other real estate	79,053		86,704		90,095
Florida [Member]
Non-covered other real estate [Rollforward]
Balance at end of period	29,963		32,370
Other non-covered real estate [Line Items]
Total other real estate, excluding covered other real estate	29,963		32,370
Other non-covered real estate by geographic location [Line Items]
Total other real estate, excluding covered other real estate	29,963		32,370
Mississippi [Member]
Non-covered other real estate [Rollforward]
Balance at end of period	19,483	[1]	24,181	[1]
Other non-covered real estate [Line Items]
Total other real estate, excluding covered other real estate	19,483	[1]	24,181	[1]
Other non-covered real estate by geographic location [Line Items]
Total other real estate, excluding covered other real estate	19,483	[1]	24,181	[1]
Tennessee [Member]
Non-covered other real estate [Rollforward]
Balance at end of period	16,879	[2]	16,407	[2]
Other non-covered real estate [Line Items]
Total other real estate, excluding covered other real estate	16,879	[2]	16,407	[2]
Other non-covered real estate by geographic location [Line Items]
Total other real estate, excluding covered other real estate	16,879	[2]	16,407	[2]
Texas [Member]
Non-covered other real estate [Rollforward]
Balance at end of period	12,728		13,746
Other non-covered real estate [Line Items]
Total other real estate, excluding covered other real estate	12,728		13,746
Other non-covered real estate by geographic location [Line Items]
Total other real estate, excluding covered other real estate	12,728		13,746
Construction, land development and other land properties [Member]
Non-covered other real estate [Rollforward]
Balance at end of period	53,834		61,963
Other non-covered real estate [Line Items]
Total other real estate, excluding covered other real estate	53,834		61,963
Other non-covered real estate by geographic location [Line Items]
Total other real estate, excluding covered other real estate	53,834		61,963
1 - 4 Family residential properties [Member]
Non-covered other real estate [Rollforward]
Balance at end of period	10,557		13,509
Other non-covered real estate [Line Items]
Total other real estate, excluding covered other real estate	10,557		13,509
Other non-covered real estate by geographic location [Line Items]
Total other real estate, excluding covered other real estate	10,557		13,509
Nonfarm, nonresidential properties [Member]
Non-covered other real estate [Rollforward]
Balance at end of period	13,883		9,820
Other non-covered real estate [Line Items]
Total other real estate, excluding covered other real estate	13,883		9,820
Other non-covered real estate by geographic location [Line Items]
Total other real estate, excluding covered other real estate	13,883		9,820
Other real estate properties [Member]
Non-covered other real estate [Rollforward]
Balance at end of period	779		1,412
Other non-covered real estate [Line Items]
Total other real estate, excluding covered other real estate	779		1,412
Other non-covered real estate by geographic location [Line Items]
Total other real estate, excluding covered other real estate	$ 779		$ 1,412

[1] Mississippi includes Central and Southern Mississippi Region

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