Allowance for Loan Losses (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012 Contract	Dec. 31, 2011 Contract
Troubled debt restructurings
Number of Contracts	3	20
Pre-modification Outstanding Recorded Investment	$ 854	$ 4,198
Post-modification Outstanding Recorded Investment	838	4,104
Construction and Land Development [Member]
Troubled debt restructurings
Number of Contracts		1
Pre-modification Outstanding Recorded Investment		39
Post-modification Outstanding Recorded Investment
Commercial and Industrial [Member]
Troubled debt restructurings
Number of Contracts	1	13
Pre-modification Outstanding Recorded Investment	750	960
Post-modification Outstanding Recorded Investment	736	909
Commercial Real Estate [Member]
Troubled debt restructurings
Number of Contracts		6
Pre-modification Outstanding Recorded Investment		3,199
Post-modification Outstanding Recorded Investment		3,195
Residential Real Estate [Member]
Troubled debt restructurings
Number of Contracts	1
Pre-modification Outstanding Recorded Investment	6
Post-modification Outstanding Recorded Investment	6
Home Equity [Member]
Troubled debt restructurings
Number of Contracts	1
Pre-modification Outstanding Recorded Investment	98
Post-modification Outstanding Recorded Investment	$ 96