Loans and Allowance for Loan Losses (Impaired Loans, Average Recorded Investment and Interest Income Recognized) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	$ 24,397	$ 30,382	$ 23,862	$ 31,372
With no related allowance recorded, interest income recognized	89	59	291	353
With an allowance recorded, average recorded investment	3,509	7,840	5,243	7,919
With an allowance recorded, interest income recognized	10	50	95	198
Impaired Financing Receivable, Average Recorded Investment	27,906	38,222	29,105	39,291
Impaired Financing Receivable, Interest Income, Cash Basis Method	99	109	386	551
Restructured loans	18,500		18,500		$ 19,400
Commercial and agricultural [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	404	222	439	222
With no related allowance recorded, interest income recognized	0	0	0	0
With an allowance recorded, average recorded investment	0	0	0	0
With an allowance recorded, interest income recognized	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	404	222	439	222
Impaired Financing Receivable, Interest Income, Cash Basis Method	0	0	0	0
Real estate - construction [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	878	2,865	1,093	2,936
With no related allowance recorded, interest income recognized	8	8	26	29
With an allowance recorded, average recorded investment	0	0	0	0
With an allowance recorded, interest income recognized	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	878	2,865	1,093	2,936
Impaired Financing Receivable, Interest Income, Cash Basis Method	8	8	26	29
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	8,786	8,253	7,937	8,400
With no related allowance recorded, interest income recognized	31	23	85	87
With an allowance recorded, average recorded investment	3,509	3,413	3,966	3,440
With an allowance recorded, interest income recognized	10	12	43	45
Impaired Financing Receivable, Average Recorded Investment	12,295	11,666	11,903	11,840
Impaired Financing Receivable, Interest Income, Cash Basis Method	41	35	128	132
Real estate - mortgage, commercial [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	14,329	19,042	14,393	19,814
With no related allowance recorded, interest income recognized	50	28	180	237
With an allowance recorded, average recorded investment	0	4,427	1,277	4,479
With an allowance recorded, interest income recognized	0	38	52	153
Impaired Financing Receivable, Average Recorded Investment	14,329	23,469	15,670	24,293
Impaired Financing Receivable, Interest Income, Cash Basis Method	50	66	232	390
Consumer [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	0	0	0	0
With no related allowance recorded, interest income recognized	0	0	0	0
With an allowance recorded, average recorded investment	0	0	0	0
With an allowance recorded, interest income recognized	0	0	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method	0	$ 0	0	$ 0
Performing Financial Instruments [Member]
Financing Receivable, Impaired [Line Items]
Restructured loans	$ 14,200		$ 14,200		$ 14,100