Other Real Estate, excluding Covered Real Estate (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011 Construction, land development and other land properties [Member]	Dec. 31, 2010 Construction, land development and other land properties [Member]	Jun. 30, 2011 1 - 4 Family residential properties [Member]	Dec. 31, 2010 1 - 4 Family residential properties [Member]	Jun. 30, 2011 Nonfarm, nonressidential properties [Member]	Dec. 31, 2010 Nonfarm, nonressidential properties [Member]	Jun. 30, 2011 Other real estate properties [Member]	Dec. 31, 2010 Other real estate properties [Member]	Jun. 30, 2011 Florida [Member]	Dec. 31, 2010 Florida [Member]	Jun. 30, 2011 Mississippi [Member]		Dec. 31, 2010 Mississippi [Member]		Jun. 30, 2011 Tennessee [Member]		Dec. 31, 2010 Tennessee [Member]		Jun. 30, 2011 Texas [Member]	Dec. 31, 2010 Texas [Member]
Non-covered other real estate [Rollforward]
Balance at beginning of period	$ 86,704	$ 90,095	$ 62,697	$ 61,963	$ 13,840	$ 13,509	$ 12,436	$ 9,820	$ 1,026	$ 1,412	$ 33,823	$ 32,370	$ 22,921	[1]	$ 24,181	[1]	$ 15,760	[2]	$ 16,407	[2]	$ 17,495	$ 13,746
Additions	32,878	34,045
Disposals	(23,191)	(24,799)
Writedowns	(6,392)	(7,941)
Balance at end of period	89,999	91,400	62,697	61,963	13,840	13,509	12,436	9,820	1,026	1,412	33,823	32,370	22,921	[1]	24,181	[1]	15,760	[2]	16,407	[2]	17,495	13,746
Gain (Loss), net on the sale of noncovered other real estate included in other expenses	552	(598)
Other non-covered real estate [Line Items]
Total other real estate, excluding covered other real estate	89,999	91,400	62,697	61,963	13,840	13,509	12,436	9,820	1,026	1,412	33,823	32,370	22,921	[1]	24,181	[1]	15,760	[2]	16,407	[2]	17,495	13,746
Other non-covered real estate by geographic location [Line Items]
Total other real estate, excluding covered other real estate	$ 89,999	$ 91,400	$ 62,697	$ 61,963	$ 13,840	$ 13,509	$ 12,436	$ 9,820	$ 1,026	$ 1,412	$ 33,823	$ 32,370	$ 22,921	[1]	$ 24,181	[1]	$ 15,760	[2]	$ 16,407	[2]	$ 17,495	$ 13,746

[1] (1) - Mississippi includes Central and Southern Mississippi Region

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