Loans and Allowance for Loan Losses (Impaired Loans Disclosure) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	$ 29,582	$ 39,865
With an allowance recorded, recorded investment	7,811	2,965
Impaired Financing Receivable, Recorded Investment	37,393	42,830
With no related allowance recorded, unpaid principal balance	38,539	52,872
With an allowance recorded, unpaid principal balance	8,459	3,032
Impaired Financing Receivable, Unpaid Principal Balance	46,998	55,904
Related allowance	422	927
Purchased impaired loans with subsequent deterioration	111,541	161,307
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	112,121	172,301
Purchased impaired loans with subsequent deterioration, related allowance	3,923	5,560
Commercial and agricultural [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	222	398
With an allowance recorded, recorded investment	0	0
Impaired Financing Receivable, Recorded Investment	222	398
With no related allowance recorded, unpaid principal balance	461	643
With an allowance recorded, unpaid principal balance	0	0
Impaired Financing Receivable, Unpaid Principal Balance	461	643
Related allowance	0	0
Purchased impaired loans with subsequent deterioration	7,774	10,729
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	6,392	10,344
Purchased impaired loans with subsequent deterioration, related allowance	380	382
Real estate - construction [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	2,830	4,734
With an allowance recorded, recorded investment	0	0
Impaired Financing Receivable, Recorded Investment	2,830	4,734
With no related allowance recorded, unpaid principal balance	3,371	8,893
With an allowance recorded, unpaid principal balance	0	0
Impaired Financing Receivable, Unpaid Principal Balance	3,371	8,893
Related allowance	0	0
Purchased impaired loans with subsequent deterioration	9,199	9,792
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	10,801	11,216
Purchased impaired loans with subsequent deterioration, related allowance	613	1,015
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	8,028	11,154
With an allowance recorded, recorded investment	3,402	2,965
Impaired Financing Receivable, Recorded Investment	11,430	14,119
With no related allowance recorded, unpaid principal balance	9,915	14,431
With an allowance recorded, unpaid principal balance	3,853	3,032
Impaired Financing Receivable, Unpaid Principal Balance	13,768	17,463
Related allowance	335	927
Purchased impaired loans with subsequent deterioration	16,892	26,628
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	17,158	28,143
Purchased impaired loans with subsequent deterioration, related allowance	375	724
Real estate - mortgage, commercial [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	18,502	23,579
With an allowance recorded, recorded investment	4,409	0
Impaired Financing Receivable, Recorded Investment	22,911	23,579
With no related allowance recorded, unpaid principal balance	24,792	28,905
With an allowance recorded, unpaid principal balance	4,606	0
Impaired Financing Receivable, Unpaid Principal Balance	29,398	28,905
Related allowance	87	0
Purchased impaired loans with subsequent deterioration	76,695	113,178
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	77,095	121,813
Purchased impaired loans with subsequent deterioration, related allowance	2,365	3,251
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	981	980
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	675	785
Purchased impaired loans with subsequent deterioration, related allowance	$ 190	$ 188