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Other Comprehensive Income (Loss) | 9 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Other Comprehensive Income (Loss) | 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) |
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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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