Derivative and Hedging Activities (Details) (USD $)	Mar. 31, 2012	Dec. 31, 2011
Summary of Fair Value of Derivative Instruments Designated as Cash flow hedges
Notional Amount	$ 100,000,000
Interest rate swaps [Member]
Summary of Fair Value of Derivative Instruments Designated as Cash flow hedges
Notional Amount	100,000,000	100,000,000
Fair Value	$ (1,240,000)	$ (2,011,000)
Maturity	5 months	8 months
Receive Rate	0.13%	0.07%
Pay Rate	3.04%	3.04%