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Benefit Plans - Fair Value Measurement of Plan Assets (Details) - Pension Plan [Member] - USD ($) | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Benefit Plans |  |  |
Fair value of plan assets | $ 72,912,000 | $ 77,603,000 | $ 78,149,000
Percentage of total | 100.00% | 100.00% |
Cash and cash equivalents |  |  |
Benefit Plans |  |  |
Fair value of plan assets | $ 3,112,000 | $ 2,353,000 |
Fixed Income Investments [Member] |  |  |
Benefit Plans |  |  |
Percentage of total | 84.80% | 86.40% |
US Treasury Securities [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | $ 10,398,000 | $ 11,354,000 |
US Government Agencies Debt Securities [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 5,089,000 | 5,899,000 |
Debt Security, Corporate, US [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 44,184,000 | 47,546,000 |
Municipal Bonds [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 345,000 | 379,000 |
Sovereign Debt Securities [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 1,830,000 | 1,901,000 |
Equity - large-cap exchange-traded fund |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 4,799,000 | 5,311,000 |
Equity - large- and mid-cap exchange-traded funds |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 839,000 |  |
Equity - mid-cap exchange-traded funds |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 901,000 |  |
Equity - large- and mid-cap exchange-traded funds |  |  |
Benefit Plans |  |  |
Fair value of plan assets |  | 844,000 |
Equity - small-cap exchange-traded funds |  |  |
Benefit Plans |  |  |
Fair value of plan assets |  | 394,000 |
Equity - international funds |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 1,415,000 | 1,622,000 |
Fair Value, Inputs, Level 1 [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 12,896,000 | 12,425,000 |
Fair Value, Inputs, Level 1 [Member] | Cash and cash equivalents |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 3,112,000 | 2,353,000 |
Fair Value, Inputs, Level 1 [Member] | Sovereign Debt Securities [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 1,830,000 | 1,901,000 |
Fair Value, Inputs, Level 1 [Member] | Equity - large-cap exchange-traded fund |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 4,799,000 | 5,311,000 |
Fair Value, Inputs, Level 1 [Member] | Equity - large- and mid-cap exchange-traded funds |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 839,000 |  |
Fair Value, Inputs, Level 1 [Member] | Equity - mid-cap exchange-traded funds |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 901,000 |  |
Fair Value, Inputs, Level 1 [Member] | Equity - large- and mid-cap exchange-traded funds |  |  |
Benefit Plans |  |  |
Fair value of plan assets |  | 844,000 |
Fair Value, Inputs, Level 1 [Member] | Equity - small-cap exchange-traded funds |  |  |
Benefit Plans |  |  |
Fair value of plan assets |  | 394,000 |
Fair Value, Inputs, Level 1 [Member] | Equity - international funds |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 1,415,000 | 1,622,000 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 60,016,000 | 65,178,000 |
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 10,398,000 | 11,354,000 |
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 5,089,000 | 5,899,000 |
Fair Value, Inputs, Level 2 [Member] | Debt Security, Corporate, US [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 44,184,000 | 47,546,000 |
Fair Value, Inputs, Level 2 [Member] | Municipal Bonds [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | 345,000 | 379,000 |
Fair Value, Inputs, Level 3 [Member] |  |  |
Benefit Plans |  |  |
Fair value of plan assets | $ 0 | $ 0 |

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