Derivative Instruments and Hedging Activities (Details1) (Interest Rate Swap Customers, USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Notional amount:	$ 7,500	$ 7,500
Not Designated as Hedging Instrument
Notional amount:	14,979	14,324
Fixed rate:	1.99%	2.05%
Variable rate:	0.21%	0.29%
Derivative Maturity Date Low End	2015-03-31	2015-03-31
Derivative Maturity Date High End	2021-10-31	2021-10-31
Weighted average remaining term	3 years 10 months 24 days	4 years 10 months 24 days
Unrealized gain (loss) fair value:	$ 673	$ 555