Defined Benefit Pension Plan (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 Officer	Mar. 31, 2012
Compensation and Retirement Disclosure [Abstract]
Number of founding Officers Eligible for Retirement Benefit Plan	3
Maximum annual benefits payable under the Executive Retirement Plan, frozen subject to cost-of-living adjustments	$ 896,000
Net periodic benefit cost recorded related to the Company's pension plans
Service costs	21,000	19,000
Interest costs	149,000	181,000
Amortization of net gain/loss	345,000	248,000
Amortization of prior service cost	(297,000)	(181,000)
Total recognized in net periodic benefit cost	$ 218,000	$ 267,000