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Pension Plans (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 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 $ 32,000 $ 31,000 96,000 $ 93,000
Interest cost on projected benefit obligations 79,000 73,000 236,000 219,000
Expected return on plan assets 0 0 0 0
Amortization of prior service costs 52,000 53,000 157,000 157,000
Amortization of actuarial (gain) loss 42,000 0 127,000 0
Net pension costs $ 205,000 157,000 $ 616,000 469,000
Pension Plan [Member]        
Net pension cost [Abstract]        
Service cost-benefits earned during period   0   0
Interest cost on projected benefit obligations   881,000   2,643,000
Expected return on plan assets   (1,214,000)   (3,642,000)
Amortization of prior service costs   0   0
Amortization of actuarial (gain) loss   79,000   237,000
Net pension costs   $ (254,000)   $ (762,000)