Derivatives (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012 item	Sep. 30, 2012 item	Dec. 31, 2011
Derivatives, Fair Value [Line Items]
Number of interest rate swaps (derivatives)	1	1
Notional amount of designated cash flow hedge	$ 20,000,000	$ 20,000,000
LIBOR-based borrowing amount	20,000,000	20,000,000
Loss reported in accumulated other comprehensive income	210,000	210,000
Tax benefit from change in accumulated loss from derivative instruments	108,000	108,000
Hedge liability	318,000	318,000	8,000
Amount deposited with counterparty	250,000	250,000
Derivatives, pledged as collateral pledged	250,000	250,000
Other assets	5,571,000	5,571,000	6,699,000
Other liabilities	2,405,000	2,405,000	1,803,000
Non-Designated Hedges [Member]
Derivatives, Fair Value [Line Items]
Other assets	122,000	122,000
Other liabilities	$ 131,000	$ 131,000