Allowance For Loan Losses (Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012		Dec. 31, 2011
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	$ 55,160		$ 53,884
With no related allowance recorded, unpaid principal balance	69,056		76,783
With an allowance recorded, recorded investment	40,778		42,357
With an allowance recorded, unpaid principal balance	46,976		44,208
With an allowance recorded, related allowance	8,724	[1]	11,090	[1]
Total recorded investment	95,938		96,241
Total unpaid principal balance	116,032		120,991
Related allowance	12,060		11,090
Purchased impaired loans with subsequent deterioration	36,659		0
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	37,555
Purchased impaired loans with subsequent deterioration, related allowance	3,336		0
Commercial and agricultural [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	1,254		2,354
With no related allowance recorded, unpaid principal balance	1,320		4,346
With an allowance recorded, recorded investment	1,774		1,536
With an allowance recorded, unpaid principal balance	2,096		2,047
With an allowance recorded, related allowance	1,208
Total recorded investment	3,028		3,890
Total unpaid principal balance	3,416		6,393
Related allowance			1,506
Purchased impaired loans with subsequent deterioration	18,911
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	18,859
Purchased impaired loans with subsequent deterioration, related allowance	1,838
Real estate - construction [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	9,496		16,351
With no related allowance recorded, unpaid principal balance	14,027		25,714
With an allowance recorded, recorded investment	14,691		14,109
With an allowance recorded, unpaid principal balance	18,669		14,718
With an allowance recorded, related allowance	2,247
Total recorded investment	24,187		30,460
Total unpaid principal balance	32,696		40,432
Related allowance			4,899
Purchased impaired loans with subsequent deterioration	2,188
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	2,244
Purchased impaired loans with subsequent deterioration, related allowance	71
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	12,197		13,003
With no related allowance recorded, unpaid principal balance	14,119		19,657
With an allowance recorded, recorded investment	8,581		11,883
With an allowance recorded, unpaid principal balance	9,810		12,328
With an allowance recorded, related allowance	2,056
Total recorded investment	20,778		24,886
Total unpaid principal balance	23,929		31,985
Related allowance			2,140
Purchased impaired loans with subsequent deterioration	3,179
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	3,729
Purchased impaired loans with subsequent deterioration, related allowance	635
Real estate - mortgage, commercial [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	32,213		22,176
With no related allowance recorded, unpaid principal balance	39,590		26,964
With an allowance recorded, recorded investment	15,531		14,659
With an allowance recorded, unpaid principal balance	16,200		14,943
With an allowance recorded, related allowance	3,012
Total recorded investment	47,744		36,835
Total unpaid principal balance	55,790		41,907
Related allowance			2,415
Purchased impaired loans with subsequent deterioration	12,307
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	12,661
Purchased impaired loans with subsequent deterioration, related allowance	718
Consumer [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	0		0
With no related allowance recorded, unpaid principal balance	0		102
With an allowance recorded, recorded investment	201		170
With an allowance recorded, unpaid principal balance	201		172
With an allowance recorded, related allowance	201
Total recorded investment	201		170
Total unpaid principal balance	201		274
Related allowance			130
Purchased impaired loans with subsequent deterioration	74
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	62
Purchased impaired loans with subsequent deterioration, related allowance	$ 74

[1] Included at June 30, 2012 and December 31, 2011 were $3.9 million and $2.9 million, respectively, in restructured and performing loans.