Loans and Allowance for Loan Losses (Details 8) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013 item	Sep. 30, 2012 item	Sep. 30, 2013 item	Sep. 30, 2012 item	Dec. 31, 2012
Loans that were modified as TDRs
Troubled debt restructurings	$ 19,300,000		$ 19,300,000		$ 22,400,000
Troubled debt restructurings, non-accrual status	11,700,000		11,700,000		14,100,000
Troubled debt restructurings, accrual status	7,566,000		7,566,000		8,282,000
Amount of specific reserves related to TDRs which were allocated to the allowance for loan losses	1,300,000		1,300,000		1,500,000
Number of Contracts	0	4	1	6
Pre- Modification		744,000	618,000	984,000
Post- Modification		744,000	481,000	966,000
Troubled debt restructurings, debt forgiven	0	0	0	0
Troubled debt restructurings, number of contracts that defaulted within 12 months of modification	0	0	0	0
Commercial, financial, and agricultural
Loans that were modified as TDRs
Number of Contracts		2		3
Pre- Modification		100,000		297,000
Post- Modification		100,000		280,000
Real estate construction - commercial
Loans that were modified as TDRs
Number of Contracts				1
Pre- Modification				43,000
Post- Modification				42,000
Real estate mortgage - residential
Loans that were modified as TDRs
Number of Contracts		2	1	2
Pre- Modification		644,000	618,000	644,000
Post- Modification		$ 644,000	$ 481,000	$ 644,000