Pension and Retirement Benefit Plans (Details) - USD ($) |
3 Months Ended | 6 Months Ended | 12 Months Ended | ||||
|---|---|---|---|---|---|---|---|
Jun. 30, 2025 |
Jun. 30, 2024 |
Jun. 30, 2025 |
Jun. 30, 2024 |
Dec. 31, 2024 |
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| Pension Plans [Line Items] | |||||||
| Fair value of plan assets | [1] | $ 42,877,000 | |||||
| Overfunded amount | 2,600,000 | ||||||
| Net periodic expense | $ 43,000 | $ 26,000 | |||||
| Expected return on plan assets | 625,000 | 552,000 | |||||
| Interest cost | 468,000 | 444,000 | |||||
| Service cost | 114,000 | 134,000 | |||||
| Retirement Plan [Member] | |||||||
| Pension Plans [Line Items] | |||||||
| Accumulated projected benefit obligation | 17,500,000 | ||||||
| Fair value of plan assets | 20,100,000 | ||||||
| Net periodic expense | $ 22,000 | $ 13,000 | |||||
| Expected return on plan assets | 313,000 | 276,000 | |||||
| Interest cost | 234,000 | 222,000 | |||||
| Service cost | 57,000 | 67,000 | |||||
| Postretirement Plan [Member] | |||||||
| Pension Plans [Line Items] | |||||||
| Accumulated projected benefit obligation | $ 3,800,000 | ||||||
| Net periodic expense | 25,000 | 54,000 | |||||
| Expected return on plan assets | 50,000 | 108,000 | |||||
| Interest cost | 48,000 | 49,000 | 97,000 | 98,000 | |||
| Service cost | 4,000 | $ 5,000 | 7,000 | $ 10,000 | |||
| Amortization of net gains | $ 27,000 | $ 54,000 | |||||
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. Reference 1: http://www.xbrl.org/2003/role/exampleRef
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