Subordinated Debentures (Details) (USD $)	0 Months Ended	12 Months Ended
	Sep. 15, 2005	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Interest expense on subordinated debentures		$ 256,000	$ 234,000	$ 381,000
Maximum consecutive quarters to defer payment of interest on junior subordinated debentures (in quarters)		20
Accrued interest payable on subordinated debentures		1,000,000
Subordinated Debentures [Member]
Debt Instrument [Line Items]
Subordinated debentures issued	10,300,000
Preferred securities issued by trust	10,300,000
Preferred securities issued by trust held as common securities	310,000
Preferred securities issued by trust held as capital securities	10,000,000
Maturity date		Sep. 30, 2035
Interest rate at period end (in hundredths)		2.108%	2.346%
Subordinated debentures, basis spread on variable rate (in hundredths)	1.80%
Description of variable rate basis		The subordinated debentures currently and until maturity bear interest at a rate equal to the sum of the 3-month London Interbank Offered Rate ("LIBOR") plus		From December 2005 until September 15, 2010, the subordinated debentures carried an interest at a rate equal to the sum of the product of 50% times the 3-month London Interbank Offered Rate ("LIBOR") plus 1.80%, plus the product of 50% times 6.186%.
3-month LIBOR rate used (in hundredths)		0.308%	0.546%
Interest expense on subordinated debentures		256,000	234,000	381,000
Maximum consecutive quarters to defer payment of interest on junior subordinated debentures (in quarters)		20
Number of quarterly interest payments deferred (in quarters)		13
Accrued interest payable on subordinated debentures		$ 1,000,000