Loans and Allowance for Loan Losses (Impaired Loans Disclosure) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	$ 24,012	$ 26,631
With an allowance recorded, recorded investment	3,448	7,851
Impaired Financing Receivable, Recorded Investment	27,460	34,482
With no related allowance recorded, unpaid principal balance	31,463	35,196
With an allowance recorded, unpaid principal balance	4,138	8,402
Impaired Financing Receivable, Unpaid Principal Balance	35,601	43,598
Related allowance	344	418
Purchased impaired loans with subsequent deterioration	89,292	118,701
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	89,885	122,779
Purchased impaired loans with subsequent deterioration	3,190	3,237
Commercial and agricultural [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	399	0
With an allowance recorded, recorded investment	0	498
Impaired Financing Receivable, Recorded Investment	399	498
With no related allowance recorded, unpaid principal balance	479	0
With an allowance recorded, unpaid principal balance	0	498
Impaired Financing Receivable, Unpaid Principal Balance	479	498
Related allowance	0	58
Purchased impaired loans with subsequent deterioration	5,848	7,535
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	4,721	6,149
Purchased impaired loans with subsequent deterioration	218	257
Real estate - construction [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	840	2,344
With an allowance recorded, recorded investment	0	0
Impaired Financing Receivable, Recorded Investment	840	2,344
With no related allowance recorded, unpaid principal balance	1,060	2,898
With an allowance recorded, unpaid principal balance	0	0
Impaired Financing Receivable, Unpaid Principal Balance	1,060	2,898
Related allowance	0	0
Purchased impaired loans with subsequent deterioration	7,547	8,619
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	8,336	9,855
Purchased impaired loans with subsequent deterioration	665	507
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	8,640	8,115
With an allowance recorded, recorded investment	3,448	3,294
Impaired Financing Receivable, Recorded Investment	12,088	11,409
With no related allowance recorded, unpaid principal balance	10,649	10,238
With an allowance recorded, unpaid principal balance	4,138	3,676
Impaired Financing Receivable, Unpaid Principal Balance	14,787	13,914
Related allowance	344	331
Purchased impaired loans with subsequent deterioration	11,854	14,174
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	12,317	15,278
Purchased impaired loans with subsequent deterioration	256	199
Real estate - mortgage, commercial [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, recorded investment	14,133	16,172
With an allowance recorded, recorded investment	0	4,059
Impaired Financing Receivable, Recorded Investment	14,133	20,231
With no related allowance recorded, unpaid principal balance	19,275	22,060
With an allowance recorded, unpaid principal balance	0	4,228
Impaired Financing Receivable, Unpaid Principal Balance	19,275	26,288
Related allowance	0	29
Purchased impaired loans with subsequent deterioration	63,085	87,345
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	63,890	90,830
Purchased impaired loans with subsequent deterioration	1,906	2,085
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	958	1,028
Purchased impaired loans with subsequent credit deterioration, unpaid principal balance	621	667
Purchased impaired loans with subsequent deterioration	$ 145	$ 189