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Pension Plans (Details) (USD $)
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net pension cost [Abstract]    
Amortization of prior service costs $ (32,000) $ (32,000)
Amortization of actuarial loss (50,000) (266,000)
Pension Plans [Member]
    
Net pension cost [Abstract]    
Service cost-benefits earned during period 31,000 27,000
Interest cost on projected benefit obligations 954,000 877,000
Expected return on plan assets (1,214,000) (1,243,000)
Amortization of prior service costs 52,000 52,000
Amortization of actuarial loss 79,000 428,000
Net pension costs (98,000) 141,000
Supplemental Executive Retirement Plan [Member]
    
Defined Benefit Plan Disclosure [Line Items]    
Maximum amount of annual retirement benefits $ 125,000