Loans and the Allowance for Loan Losses (Details 7) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Loan portfolio not subject to risk rating
Loan portfolio	$ 991,103	$ 854,485
Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	983,432	847,071
Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	7,671	7,414
Commercial, financial, agricultural [Member]
Loan portfolio not subject to risk rating
Loan portfolio	71,715	62,062
Commercial, financial, agricultural [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	71,361	61,864
Commercial, financial, agricultural [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	354	198
Lease financing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	224	343
Lease financing [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	224	343
Lease financing [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio
Real estate - construction [Member]
Loan portfolio not subject to risk rating
Loan portfolio	26,328	19,096
Real estate - construction [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	26,328	18,756
Real estate - construction [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio		340
Real estate - 1-4 family mortgage [Member]
Loan portfolio not subject to risk rating
Loan portfolio	648,742	560,653
Real estate - 1-4 family mortgage [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	642,450	554,702
Real estate - 1-4 family mortgage [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	6,292	5,951
Real estate - commercial mortgage [Member]
Loan portfolio not subject to risk rating
Loan portfolio	187,709	156,806
Real estate - commercial mortgage [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	186,744	156,050
Real estate - commercial mortgage [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	965	756
Installment loans to individuals [Member]
Loan portfolio not subject to risk rating
Loan portfolio	56,385	55,525
Installment loans to individuals [Member] | Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	56,325	55,356
Installment loans to individuals [Member] | Non-Performing [Member]
Loan portfolio not subject to risk rating
Loan portfolio	$ 60	$ 169