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Postretirement Benefit Plans (Expected Benefit Payments) (Details)
12 Months Ended
Dec. 31, 2020
USD ($)
Defined Benefit Postretirement Health And Life Coverage [Member]  
Defined Benefit Plan Disclosure [Line Items]  
1/1/2021 to 12/31/2021 $ 36,000
1/1/2022 to 12/31/2022 37,000
1/1/2023 to 12/31/2023 34,000
1/1/2024 to 12/31/2024 31,000
1/1/2025 to 12/31/2025 32,000
1/1/2026 to 12/31/2030 170,000
Defined contribution plan, employer discretionary contribution amount 36,000
Director's Retirement Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
1/1/2021 to 12/31/2021 100,000
1/1/2022 to 12/31/2022 102,000
1/1/2023 to 12/31/2023 102,000
1/1/2024 to 12/31/2024 83,000
1/1/2025 to 12/31/2025 85,000
1/1/2026 to 12/31/2030 328,000
Defined contribution plan, employer discretionary contribution amount 100,000
Scottdale Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
1/1/2021 to 12/31/2021 85,000
1/1/2022 to 12/31/2022 102,000
1/1/2023 to 12/31/2023 104,000
1/1/2024 to 12/31/2024 226,000
1/1/2025 to 12/31/2025 282,000
1/1/2026 to 12/31/2030 1,595,000
Defined contribution plan, employer discretionary contribution amount $ 300,000