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Postretirement Benefit Plans (Expected Benefit Payments) (Details)
12 Months Ended
Dec. 31, 2016
USD ($)
Defined Benefit Postretirement Health And Life Coverage [Member]  
Defined Benefit Plan Disclosure [Line Items]  
1/1/2017 to 12/31/2017 $ 73,000
1/1/2018 to 12/31/2018 64,000
1/1/2019 to 12/31/2019 61,000
1/1/2020 to 12/31/2020 56,000
1/1/2021 to 12/31/2021 30,000
1/1/2022 to 12/31/2026 156,000
Defined contribution plan, employer discretionary contribution amount 73,000
Director's Retirement Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
1/1/2017 to 12/31/2017 94,000
1/1/2018 to 12/31/2018 96,000
1/1/2019 to 12/31/2019 96,000
1/1/2020 to 12/31/2020 98,000
1/1/2021 to 12/31/2021 108,000
1/1/2022 to 12/31/2026 464,000
Defined contribution plan, employer discretionary contribution amount $ 94,000