Credit Quality of Loans and Allowance for Loan Losses, Troubled Debt Restructuring (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Contract	Dec. 31, 2012	Mar. 31, 2013 Commercial, Financial and Agricultural [Member] Contract	Dec. 31, 2012 Commercial, Financial and Agricultural [Member] Contract	Mar. 31, 2012 Commercial, Financial and Agricultural [Member] Contract	Mar. 31, 2013 Real Estate - Commercial [Member] Contract	Dec. 31, 2012 Real Estate - Commercial [Member] Contract
Troubled Debt Restructuring [Abstract]
Number of Contracts			4	3		3	3
Pre-Modification Outstanding Recorded Investment	$ 5,395	$ 5,353	$ 412	$ 370		$ 4,983	$ 4,983
Post-Modification Outstanding Recorded Investment	5,032	5,062	370	353		4,662	4,709
Trouble debt restructurings that Subsequently Defaulted, Number of Contracts			4		3
Trouble debt restructurings that Subsequently Defaulted, Recorded Investment			259		251
Pre-modified contracts identified as TDRs	1
Pre-modification balance identified as TDR	$ 27,000