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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 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 nine months ended September 30, 2025 and 2024, net of tax:
September 30, 2025 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at July 1, 2025 |  | $ | (207,046) |  |  | $ | (514) |  |  | $ | (207,560) |
Other Comprehensive Income (Loss) Before Reclassification |  | 25,180 |  |  | — |  |  | 25,180 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | — |  |  | — |
Net Current Period Other Comprehensive Income (Loss) |  | 25,180 |  |  | — |  |  | 25,180 |
Ending Balance at September 30, 2025 |  | $ | (181,866) |  |  | $ | (514) |  |  | $ | (182,380) |
September 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 |  | 38,084 |  |  | — |  |  | 38,084 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | — |  |  | — |
Net Current Period Other Comprehensive Income (Loss) |  | 38,084 |  |  | — |  |  | 38,084 |
Ending Balance at September 30, 2025 |  | $ | (181,866) |  |  | $ | (514) |  |  | $ | (182,380) |
September 30, 2024 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at July 1, 2024 |  | $ | (217,355) |  |  | $ | (514) |  |  | $ | (217,869) |
Other Comprehensive Income (Loss) Before Reclassification |  | 42,775 |  |  | — |  |  | 42,775 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 55 |  |  | — |  |  | 55 |
Net Current Period Other Comprehensive Income (Loss) |  | 42,830 |  |  | — |  |  | 42,830 |
Ending Balance at September 30, 2024 |  | $ | (174,525) |  |  | $ | (514) |  |  | $ | (175,039) |
September 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 |  | 14,914 |  |  | — |  |  | 14,914 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 27,107 |  |  | — |  |  | 27,107 |
Net Current Period Other Comprehensive Income (Loss) |  | 42,021 |  |  | — |  |  | 42,021 |
Ending Balance at September 30, 2024 |  | $ | (174,525) |  |  | $ | (514) |  |  | $ | (175,039) |
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 nine months ended September 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 September 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 Nine Months Ended September 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 |  | $ | 70 |  |  | Net Gains on Securities
|  | (15) |  |  | Income Tax Expense
|  | 55 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended September 30, 2024 |  | $ | 55 |  |  |
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 |  | $ | (34,788) |  |  | Net Gains (Losses) on Securities
|  | 7,681 |  |  | Income Tax Expense
|  | (27,107) |  |  | Net of Tax
Total Reclassifications for the Nine Months Ended September 30, 2024 |  | $ | (27,107) |  |  |

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