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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2024
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 months ended March 31, 2024 and 2023, net of tax:
March 31, 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 |  | (19,867) |  |  | — |  |  | (19,867) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (28) |  |  | — |  |  | (28) |
Net Current Period Other Comprehensive Income (Loss) |  | (19,895) |  |  | — |  |  | (19,895) |
Ending Balance at March 31, 2024 |  | $ | (236,441) |  |  | $ | (514) |  |  | $ | (236,955) |
March 31, 2023 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at January 1, 2023 |  | $ | (262,924) |  |  | $ | (514) |  |  | $ | (263,438) |
Other Comprehensive Income (Loss) Before Reclassification |  | 32,948 |  |  | — |  |  | 32,948 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (2) |  |  | — |  |  | (2) |
Net Current Period Other Comprehensive Income (Loss) |  | 32,946 |  |  | — |  |  | 32,946 |
Ending Balance at March 31, 2023 |  | $ | (229,978) |  |  | $ | (514) |  |  | $ | (230,492) |
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 months ended March 31, 2024 and 2023:
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 |  | $ | 35 |  |  | Net Gains on Securities
|  | (7) |  |  | Income Tax Expense
|  | 28 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended March 31, 2024 |  | $ | 28 |  |  |
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 |  | $ | 2 |  |  | Net Gains on Securities
|  | — |  |  | Income Tax Expense
|  | 2 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended March 31, 2023 |  | $ | 2 |  |  |

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