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Post-Retirement Benefits (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Post-Retirement Benefits      
Number of post-retirement health and life insurance benefit plans | item 2    
Change in benefit obligation:      
Benefit obligation at beginning of year   $ 2,331,000 $ 2,197,000
Interest cost     85,000
Participants' contributions     72,000
Actuarial (gain) loss     299,000
Benefits paid     (322,000)
Benefit obligation at end of year     2,331,000
Change in plan assets:      
Employer contribution     250,000
Participants' contributions     72,000
Benefits paid     (322,000)
Funded status     $ (2,331,000)
Weighted-average assumptions used to determine the benefit obligation      
Discount rate (as a percent)     3.45%
Weighted-average assumptions used to determine net periodic pension cost      
Discount rate (as a percent)     4.05%
Assumed health care cost trend rates      
Health care cost trend rate assumed for next fiscal year (as a percent)     6.50%
Components of net periodic pension cost and other amounts recognized in other comprehensive income      
Interest cost     $ 85,000
Net periodic pension expense $ (205,000) (152,000) (169,000)
Total amount recognized in other comprehensive income 1,202,000 2,229,000 3,727,000
Effects of one-percentage point change in assumed health care cost trend rates      
One-Percentage Point Increase, Effect on aggregate service and interest cost 6,000    
One-Percentage Point Decrease, Effect on aggregate service and interest cost (6,000)    
One-Percentage Point Increase, Effect on postretirement benefit obligation 176    
One-Percentage Point Decrease, Effect on postretirement benefit obligation (159)    
Other Comprehensive Income      
Change in benefit obligation:      
Interest cost 1,132,000 1,017,000 1,110,000
Components of net periodic pension cost and other amounts recognized in other comprehensive income      
Interest cost 1,132,000 1,017,000 1,110,000
Recognized net actuarial loss 816,000 898,000 659,000
Net periodic pension expense (71,000) (152,000) (169,000)
Net (gain) loss 655,000 2,315,000 3,404,000
Amortization of loss (816,000) (898,000) (659,000)
Total amount recognized in other comprehensive income (161,000) 1,417,000 2,745,000
Total recognized in net periodic benefit cost and other comprehensive income (232,000) 1,265,000 2,576,000
Retiree Medical Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 422,000 436,000 444,000
Interest cost 13,000 12,000 15,000
Actuarial (gain) loss 1,000 19,000 24,000
Benefits paid (43,000) (45,000) (47,000)
Benefit obligation at end of year 393,000 422,000 436,000
Change in plan assets:      
Employer contribution 43,000 45,000 47,000
Benefits paid (43,000) (45,000) (47,000)
Funded status $ (393,000) $ (422,000) $ (436,000)
Weighted-average assumptions used to determine the benefit obligation      
Discount rate (as a percent) 3.50% 3.30% 3.00%
Weighted-average assumptions used to determine net periodic pension cost      
Discount rate (as a percent) 3.30% 3.00% 3.60%
Assumed health care cost trend rates      
Health care cost trend rate assumed for next fiscal year (as a percent) 5.00% 5.00% 5.00%
Components of net periodic pension cost and other amounts recognized in other comprehensive income      
Interest cost $ 13,000 $ 12,000 $ 15,000
Recognized net actuarial loss 10,000 9,000 6,000
Net periodic pension expense 23,000 21,000 21,000
Net (gain) loss 1,000 19,000 24,000
Amortization of loss (10,000) (9,000) (6,000)
Total amount recognized in other comprehensive income (9,000) 10,000 18,000
Total recognized in net periodic benefit cost and other comprehensive income 14,000 31,000 39,000
Estimated net loss for the retiree medical plan that will be amortized from other comprehensive income into periodic benefit cost over the next fiscal year      
Estimated net loss for the plan that will be amortized from other comprehensive income into periodic benefit cost over the next fiscal year 10,000,000    
Effects of one-percentage point change in assumed health care cost trend rates      
One-Percentage Point Increase, Effect on aggregate service and interest cost 1,000    
One-Percentage Point Decrease, Effect on aggregate service and interest cost (1,000)    
One-Percentage Point Increase, Effect on postretirement benefit obligation 23,000    
One-Percentage Point Decrease, Effect on postretirement benefit obligation (21,000)    
Estimated future benefit payments (including expected future service as appropriate)      
2017 42,000    
2018 42,000    
2019 41,000    
2020 39,000    
2021 38,000    
2022-2026 157,000    
Estimated future benefit payments 359,000    
Expected contributions in the next fiscal year      
Amount of expected contributions in the next fiscal year 42,000    
Retiree Welfare Plan      
Change in benefit obligation:      
Benefit obligation at beginning of year 2,092,000 2,331,000  
Interest cost 74,000 77,000  
Actuarial (gain) loss 546,000 (105,000)  
Benefits paid (280,000) (233,000)  
less: federal subsidy on benefits paid 15,000 22,000  
Benefit obligation at end of year 2,447,000 2,092,000 2,331,000
Change in plan assets:      
Employer contribution 280,000 233,000  
Benefits paid (280,000) (233,000)  
Funded status $ (2,447,000) $ (2,092,000)  
Weighted-average assumptions used to determine the benefit obligation      
Discount rate (as a percent) 3.50% 3.70%  
Weighted-average assumptions used to determine net periodic pension cost      
Discount rate (as a percent) 3.70% 3.45%  
Assumed health care cost trend rates      
Health care cost trend rate assumed for next fiscal year (as a percent) 5.00% 6.25%  
Components of net periodic pension cost and other amounts recognized in other comprehensive income      
Interest cost $ 74,000 $ 77,000  
Estimated net loss for the retiree medical plan that will be amortized from other comprehensive income into periodic benefit cost over the next fiscal year      
Estimated net loss for the plan that will be amortized from other comprehensive income into periodic benefit cost over the next fiscal year 134,000    
Estimated future benefit payments (including expected future service as appropriate)      
2017 236,000    
2018 233,000    
2019 229,000    
2020 223,000    
2021 216,000    
2022-2026 932,000    
Estimated future benefit payments 2,069,000    
Expected contributions in the next fiscal year      
Amount of expected contributions in the next fiscal year 236,000    
Retiree Welfare Plan | Other Comprehensive Income      
Change in benefit obligation:      
Interest cost 74,000 77,000 84,000
Components of net periodic pension cost and other amounts recognized in other comprehensive income      
Interest cost 74,000 77,000 84,000
Recognized net actuarial loss 95,000 115,000 96,000
Net periodic pension expense 169,000 192,000 180,000
Net (gain) loss 546,000 (106,000) 299,000
Amortization of loss (95,000) (115,000) (96,000)
Total amount recognized in other comprehensive income 451,000 (221,000) 203,000
Total recognized in net periodic benefit cost and other comprehensive income $ 620,000 $ (29,000) $ 383,000