Other Real Estate and Covered Other Real Estate, (by geographic location) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012	Dec. 31, 2012		Dec. 31, 2011
Other Real Estate and Covered Other Real Estate [Abstract]
Covered other real estate, beginning of period	$ 5,741		$ 6,331
Transfers from covered loans	1,380		1,424
FASB ASC 310-30 adjustment for the residual recorded investment	(541)		(112)
Net transfers from covered loans	839		1,312
Disposals	(848)		(1,673)
Writedowns	(640)		(248)
Covered other real estate, end of period	5,092		5,722
Gain, net on the sale of covered other real estate included in ORE/Foreclosure expense	47		440
Other non covered real estate [Line Items]
Total other real estate, excluding covered other real estate	116,329		82,475	78,189		79,053
Alabama [Member]
Other non covered real estate [Line Items]
Total other real estate, excluding covered other real estate	25,308			0
Florida [Member]
Other non covered real estate [Line Items]
Total other real estate, excluding covered other real estate	39,198			18,569
Mississippi [Member]
Other non covered real estate [Line Items]
Total other real estate, excluding covered other real estate	25,439	[1]		27,771	[1]
Tennessee [Member]
Other non covered real estate [Line Items]
Total other real estate, excluding covered other real estate	14,615	[2]		17,589	[2]
Texas [Member]
Other non covered real estate [Line Items]
Total other real estate, excluding covered other real estate	$ 11,769			$ 14,260

[1] Mississippi includes Central and Southern Mississippi Regions

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