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Postretirement Benefit Plans - Expected Benefit Payments (Details)
$ in Thousands
Dec. 31, 2022
USD ($)
Defined Benefit Postretirement Health And Life Coverage  
Defined Benefit Plan Disclosure [Line Items]  
2023 $ 31
2024 27
2025 32
2026 27
2027 25
2028-2032 141
Director's Retirement Plan  
Defined Benefit Plan Disclosure [Line Items]  
2023 110
2024 104
2025 108
2026 106
2027 94
2028-2032 485
Scottdale Defined Benefit Pension Plan  
Defined Benefit Plan Disclosure [Line Items]  
2023 91
2024 202
2025 251
2026 248
2027 277
2028-2032 1,555
Riverview Defined Benefit Plan | Pension Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 551
2024 536
2025 517
2026 504
2027 488
2028-2032 2,293
Riverview Defined Benefit Plan | Postretirement Life Insurance Benefits  
Defined Benefit Plan Disclosure [Line Items]  
2023 3
2024 3
2025 3
2026 3
2027 2
2028-2032 $ 9