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Pension Plans (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
SERP [Member]        
Defined Benefit Plan Disclosure [Line Items]        
Maximum amount of annual retirement benefits     $ 125,000  
Net pension cost [Abstract]        
Service cost-benefits earned during period $ 28,000 $ 31,000 64,000 $ 62,000
Interest cost on projected benefit obligations 85,000 73,000 157,000 145,000
Expected return on plan assets 0 0 0 0
Amortization of prior service costs 52,000 52,000 105,000 104,000
Amortization of actuarial (gain) loss 55,000 0 85,000 0
Net pension costs $ 220,000 156,000 $ 411,000 311,000
Pension Plan [Member]        
Net pension cost [Abstract]        
Service cost-benefits earned during period   0   0
Interest cost on projected benefit obligations   881,000   1,763,000
Expected return on plan assets   (1,214,000)   (2,428,000)
Amortization of prior service costs   0   0
Amortization of actuarial (gain) loss   79,000   158,000
Net pension costs   $ (254,000)   $ (507,000)