Loans and Allowance for Loan Losses (Impaired Loans Disclosure) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	$ 39,865	$ 62,282
With an allowance recorded, recorded investment	2,965	15,312
Impaired Financing Receivable, Recorded Investment	42,830	77,594
With no related allowance recorded, unpaid principal balance	52,872	80,510
With an allowance recorded, unpaid principal balance	3,032	18,904
Impaired Financing Receivable, Unpaid Principal Balance	55,904	99,414
Related allowance	927	1,737
Purchased impaired loans with subsequent deterioration	161,307	192,115
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	172,301	196,617
Purchased impaired loans with subsequent deterioration, related allowance	5,560	5,373
Commercial and agricultural [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	398	1,755
With an allowance recorded, recorded investment	0	579
Impaired Financing Receivable, Recorded Investment	398	2,334
With no related allowance recorded, unpaid principal balance	643	2,608
With an allowance recorded, unpaid principal balance	0	602
Impaired Financing Receivable, Unpaid Principal Balance	643	3,210
Related allowance	0	282
Purchased impaired loans with subsequent deterioration	10,729	11,533
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	10,344	11,728
Purchased impaired loans with subsequent deterioration, related allowance	382	524
Real estate - construction [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	4,734	11,875
With an allowance recorded, recorded investment	0	1,658
Impaired Financing Receivable, Recorded Investment	4,734	13,533
With no related allowance recorded, unpaid principal balance	8,893	18,553
With an allowance recorded, unpaid principal balance	0	1,843
Impaired Financing Receivable, Unpaid Principal Balance	8,893	20,396
Related allowance	0	82
Purchased impaired loans with subsequent deterioration	9,792	2,285
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	11,216	2,236
Purchased impaired loans with subsequent deterioration, related allowance	1,015	200
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	11,154	16,437
With an allowance recorded, recorded investment	2,965	1,681
Impaired Financing Receivable, Recorded Investment	14,119	18,118
With no related allowance recorded, unpaid principal balance	14,431	20,764
With an allowance recorded, unpaid principal balance	3,032	1,745
Impaired Financing Receivable, Unpaid Principal Balance	17,463	22,509
Related allowance	927	607
Purchased impaired loans with subsequent deterioration	26,628	34,961
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	28,143	35,802
Purchased impaired loans with subsequent deterioration, related allowance	724	711
Real estate - mortgage, commercial [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	23,579	32,215
With an allowance recorded, recorded investment	0	11,394
Impaired Financing Receivable, Recorded Investment	23,579	43,609
With no related allowance recorded, unpaid principal balance	28,905	38,585
With an allowance recorded, unpaid principal balance	0	14,714
Impaired Financing Receivable, Unpaid Principal Balance	28,905	53,299
Related allowance	0	766
Purchased impaired loans with subsequent deterioration	113,178	141,974
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	121,813	145,704
Purchased impaired loans with subsequent deterioration, related allowance	3,251	3,388
Consumer [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	0	0
With an allowance recorded, recorded investment	0	0
Impaired Financing Receivable, Recorded Investment	0	0
With no related allowance recorded, unpaid principal balance	0	0
With an allowance recorded, unpaid principal balance	0	0
Impaired Financing Receivable, Unpaid Principal Balance	0	0
Related allowance	0	0
Purchased impaired loans with subsequent deterioration	980	1,362
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	785	1,147
Purchased impaired loans with subsequent deterioration, related allowance	$ 188	$ 550