Defined Benefit Pension Plans (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 Officer	Jun. 30, 2011
Net periodic benefit cost recorded related to the Company's pension plans
Service costs	$ 19,000	$ 17,000	$ 38,000	$ 34,000
Interest costs	181,000	212,000	363,000	426,000
Amortization of net gain/loss	248,000	232,000	496,000	464,000
Amortization of prior service cost	(181,000)	0	(362,000)	0
Total recognized in net periodic benefit cost	267,000	461,000	535,000	924,000
Defined Benefit Pension Plans (Textual) [Abstract]
Maximum annual benefits payable under the Executive Retirement Plan, frozen subject to cost-of-living adjustments	$ 896,000		$ 896,000
Number of founding Officers Eligible for Retirement Benefit Plan			3