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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2025
Equity [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income (Loss) | The tables below summarize the changes in accumulated other comprehensive income (loss) by component for the three and six months ended June 30, 2025 and 2024, net of tax:
June 30, 2025 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at April 1, 2025 |  | $ | (209,167) |  |  | $ | (514) |  |  | $ | (209,681) |
Other Comprehensive Income (Loss) Before Reclassification |  | 2,121 |  |  | — |  |  | 2,121 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | — |  |  | — |
Net Current Period Other Comprehensive Income (Loss) |  | 2,121 |  |  | — |  |  | 2,121 |
Ending Balance at June 30, 2025 |  | $ | (207,046) |  |  | $ | (514) |  |  | $ | (207,560) |
June 30, 2025 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at January 1, 2025 |  | $ | (219,950) |  |  | $ | (514) |  |  | $ | (220,464) |
Other Comprehensive Income (Loss) Before Reclassification |  | 12,904 |  |  | — |  |  | 12,904 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | — |  |  | — |
Net Current Period Other Comprehensive Income (Loss) |  | 12,904 |  |  | — |  |  | 12,904 |
Ending Balance at June 30, 2025 |  | $ | (207,046) |  |  | $ | (514) |  |  | $ | (207,560) |
June 30, 2024 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at April 1, 2024 |  | $ | (236,441) |  |  | $ | (514) |  |  | $ | (236,955) |
Other Comprehensive Income (Loss) Before Reclassification |  | (8,103) |  |  | — |  |  | (8,103) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 27,189 |  |  | — |  |  | 27,189 |
Net Current Period Other Comprehensive Income (Loss) |  | 19,086 |  |  | — |  |  | 19,086 |
Ending Balance at June 30, 2024 |  | $ | (217,355) |  |  | $ | (514) |  |  | $ | (217,869) |
June 30, 2024 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at January 1, 2024 |  | $ | (216,546) |  |  | $ | (514) |  |  | $ | (217,060) |
Other Comprehensive Income (Loss) Before Reclassification |  | (27,970) |  |  | — |  |  | (27,970) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 27,161 |  |  | — |  |  | 27,161 |
Net Current Period Other Comprehensive Income (Loss) |  | (809) |  |  | — |  |  | (809) |
Ending Balance at June 30, 2024 |  | $ | (217,355) |  |  | $ | (514) |  |  | $ | (217,869) |
Schedule of Classifications Out of Accumulated Other Comprehensive Income (Loss) | The tables below summarize the classifications out of accumulated other comprehensive income (loss) by component for the three and six months ended June 30, 2025 and 2024:
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Amount Reclassified From Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in the Statement Where Net Income is Presented
Unrealized Gains and Losses on Available-for-Sale Securities |  | $ | — |  |  | Net Gains (Losses) on Securities
|  | — |  |  | Income Tax Expense
|  | — |  |  | Net of Tax
Total Reclassifications for the Three Months Ended June 30, 2025 |  | $ | — |  |  |
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Amount Reclassified From Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in the Statement Where Net Income is Presented
Unrealized Gains and Losses on Available-for-Sale Securities |  | $ | — |  |  | Net Gains (Losses) on Securities
|  | — |  |  | Income Tax Expense
|  | — |  |  | Net of Tax
Total Reclassifications for the Six Months Ended June 30, 2025 |  | $ | — |  |  |
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Amount Reclassified From Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in the Statement Where Net Income is Presented
Unrealized Gains and Losses on Available-for-Sale Securities |  | $ | (34,893) |  |  | Net Gains on Securities
|  | 7,704 |  |  | Income Tax Expense
|  | (27,189) |  |  | Net of Tax
Total Reclassifications for the Three Months Ended June 30, 2024 |  | $ | (27,189) |  |  |
Details about Accumulated Other Comprehensive Income (Loss) Components |  | Amount Reclassified From Accumulated Other Comprehensive Income (Loss) |  | Affected Line Item in the Statement Where Net Income is Presented
Unrealized Gains and Losses on Available-for-Sale Securities |  | $ | (34,858) |  |  | Net Gains (Losses) on Securities
|  | 7,697 |  |  | Income Tax Expense
|  | (27,161) |  |  | Net of Tax
Total Reclassifications for the Six Months Ended June 30, 2024 |  | $ | (27,161) |  |  |

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