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Post Retirement Benefits - Change in Benefit Obligation (Details) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Change in benefit obligation:      
Interest cost $ 323,000 $ 316,000 $ 277,000
Postretirement benefits      
Change in benefit obligation:      
Benefit obligation at beginning of year 9,006,000 9,172,000  
Interest cost 323,000 316,000  
Defined Benefit Plan, Actuarial Gain (Loss) 320,000 (48,000)  
Benefits paid (342,000) (434,000)  
Benefit obligation at beginning of year 8,667,000 9,006,000 $ 9,172,000
Plan Assets 0 0  
Amounts recorded in accumulated other comprehensive income:      
Prior service credit (7,098,000) (7,594,000)  
Net loss 3,464,000 3,939,000  
Total $ (3,634,000) $ (3,655,000)  
Weighted-average assumptions:      
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate 3.80% 4.10%