Loans and Allowance for Loan Losses (Impaired Loans, Average Recorded Investment and Interest Income Recognized) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	$ 22,760	$ 33,483
With no related allowance recorded, interest income recognized	115	127
With an allowance recorded, average recorded investment	7,574	8,031
With an allowance recorded, interest income recognized	71	51
Impaired Financing Receivable, Average Recorded Investment	30,334	41,514
Impaired Financing Receivable, Interest Income, Cash Basis Method	186	178
Commercial and agricultural [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	478	242
With no related allowance recorded, interest income recognized	0	0
With an allowance recorded, average recorded investment	0	0
With an allowance recorded, interest income recognized	0	0
Impaired Financing Receivable, Average Recorded Investment	478	242
Impaired Financing Receivable, Interest Income, Cash Basis Method	0	0
Real estate - construction [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	1,276	2,688
With no related allowance recorded, interest income recognized	11	10
With an allowance recorded, average recorded investment	0	650
With an allowance recorded, interest income recognized	0	2
Impaired Financing Receivable, Average Recorded Investment	1,276	3,338
Impaired Financing Receivable, Interest Income, Cash Basis Method	11	12
Real estate - mortgage, 1-4 family residential [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	7,925	9,050
With no related allowance recorded, interest income recognized	31	28
With an allowance recorded, average recorded investment	3,744	3,829
With an allowance recorded, interest income recognized	19	19
Impaired Financing Receivable, Average Recorded Investment	11,669	12,879
Impaired Financing Receivable, Interest Income, Cash Basis Method	50	47
Real estate - mortgage, commercial [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	13,081	21,503
With no related allowance recorded, interest income recognized	73	89
With an allowance recorded, average recorded investment	3,830	3,552
With an allowance recorded, interest income recognized	52	30
Impaired Financing Receivable, Average Recorded Investment	16,911	25,055
Impaired Financing Receivable, Interest Income, Cash Basis Method	125	119
Consumer [Member]
Financing Receivable, Impaired [Line Items]
With no related allowance recorded, average recorded investment	0	0
With no related allowance recorded, interest income recognized	0	0
With an allowance recorded, average recorded investment	0	0
With an allowance recorded, interest income recognized	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0
Impaired Financing Receivable, Interest Income, Cash Basis Method	$ 0	$ 0