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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2023
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, 2023 and 2022, net of tax:
September 30, 2023 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at July 1, 2023 |  | $ | (248,338) |  |  | $ | (514) |  |  | $ | (248,852) |
Other Comprehensive Income (Loss) Before Reclassification |  | (78,761) |  |  | — |  |  | (78,761) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | — |  |  | — |  |  | — |
Net Current Period Other Comprehensive Income (Loss) |  | (78,761) |  |  | — |  |  | (78,761) |
Ending Balance at September 30, 2023 |  | $ | (327,099) |  |  | $ | (514) |  |  | $ | (327,613) |
September 30, 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 |  | (64,143) |  |  | — |  |  | (64,143) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (32) |  |  | — |  |  | (32) |
Net Current Period Other Comprehensive Income (Loss) |  | (64,175) |  |  | — |  |  | (64,175) |
Ending Balance at September 30, 2023 |  | $ | (327,099) |  |  | $ | (514) |  |  | $ | (327,613) |
September 30, 2022 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at July 1, 2022 |  | $ | (210,527) |  |  | $ | (568) |  |  | $ | (211,095) |
Other Comprehensive Income (Loss) Before Reclassification |  | (97,945) |  |  | — |  |  | (97,945) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (18) |  |  | — |  |  | (18) |
Net Current Period Other Comprehensive Income (Loss) |  | (97,963) |  |  | — |  |  | (97,963) |
Ending Balance at September 30, 2022 |  | $ | (308,490) |  |  | $ | (568) |  |  | $ | (309,058) |
September 30, 2022 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at January 1, 2022 |  | $ | 16,052 |  |  | $ | (568) |  |  | $ | 15,484 |
Other Comprehensive Income (Loss) Before Reclassification |  | (324,168) |  |  | — |  |  | (324,168) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (374) |  |  | — |  |  | (374) |
Net Current Period Other Comprehensive Income (Loss) |  | (324,542) |  |  | — |  |  | (324,542) |
Ending Balance at September 30, 2022 |  | $ | (308,490) |  |  | $ | (568) |  |  | $ | (309,058) |
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, 2023 and 2022:
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 on Securities
|  | — |  |  | Income Tax Expense
|  | — |  |  | Net of Tax
Total Reclassifications for the Three Months Ended September 30, 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 |  | $ | 40 |  |  | Net Gains on Securities
|  | (8) |  |  | Income Tax Expense
|  | 32 |  |  | Net of Tax
Total Reclassifications for the Nine Months Ended September 30, 2023 |  | $ | 32 |  |  |
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 |  | $ | 23 |  |  | Net Gains on Securities
|  | (5) |  |  | Income Tax Expense
|  | 18 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended September 30, 2022 |  | $ | 18 |  |  |
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 |  | $ | 473 |  |  | Net Gains on Securities
|  | (99) |  |  | Income Tax Expense
|  | 374 |  |  | Net of Tax
Total Reclassifications for the Nine Months Ended September 30, 2022 |  | $ | 374 |  |  |

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