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Postretirement Benefit Plans (Expected Benefit Payments) (Details)
12 Months Ended
Dec. 31, 2021
USD ($)
Defined Benefit Postretirement Health And Life Coverage [Member]  
Defined Benefit Plan Disclosure [Line Items]  
1/1/2022 to 12/31/2022 $ 38,000
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 35,000
1/1/2026 to 12/31/2026 26,000
1/1/2027 to 12/31/2031 164,000
Defined contribution plan, employer discretionary contribution amount 38,000
Director's Retirement Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
1/1/2022 to 12/31/2022 108,000
1/1/2023 to 12/31/2023 101,000
1/1/2024 to 12/31/2024 89,000
1/1/2025 to 12/31/2025 91,000
1/1/2026 to 12/31/2026 88,000
1/1/2027 to 12/31/2031 350,000
Defined contribution plan, employer discretionary contribution amount 108,000
Scottdale Defined Benefit Pension Plan [Member]  
Defined Benefit Plan Disclosure [Line Items]  
1/1/2022 to 12/31/2022 93,000
1/1/2023 to 12/31/2023 95,000
1/1/2024 to 12/31/2024 207,000
1/1/2025 to 12/31/2025 257,000
1/1/2026 to 12/31/2026 253,000
1/1/2027 to 12/31/2031 1,547,000
Defined contribution plan, employer discretionary contribution amount 0
Riverview Defined Benefit Plan [Member] | Pension Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
1/1/2022 to 12/31/2022 540,000
1/1/2023 to 12/31/2023 526,000
1/1/2024 to 12/31/2024 522,000
1/1/2025 to 12/31/2025 503,000
1/1/2026 to 12/31/2026 492,000
1/1/2027 to 12/31/2031 2,303,000
Riverview Defined Benefit Plan [Member] | Postretirement Life Insurance Benefits [Member]  
Defined Benefit Plan Disclosure [Line Items]  
1/1/2022 to 12/31/2022 4,000
1/1/2023 to 12/31/2023 4,000
1/1/2024 to 12/31/2024 4,000
1/1/2025 to 12/31/2025 3,000
1/1/2026 to 12/31/2026 3,000
1/1/2027 to 12/31/2031 $ 11,000