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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2022
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, 2022 and 2021, net of tax:
June 30, 2022 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at April 1, 2022 |  | $ | (117,833) |  |  | $ | (568) |  |  | $ | (118,401) |
Other Comprehensive Income (Loss) Before Reclassification |  | (92,632) |  |  | — |  |  | (92,632) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (62) |  |  | — |  |  | (62) |
Net Current Period Other Comprehensive Income (Loss) |  | (92,694) |  |  | — |  |  | (92,694) |
Ending Balance at June 30, 2022 |  | $ | (210,527) |  |  | $ | (568) |  |  | $ | (211,095) |
June 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 |  | (226,223) |  |  | — |  |  | (226,223) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (356) |  |  | — |  |  | (356) |
Net Current Period Other Comprehensive Income (Loss) |  | (226,579) |  |  | — |  |  | (226,579) |
Ending Balance at June 30, 2022 |  | $ | (210,527) |  |  | $ | (568) |  |  | $ | (211,095) |
June 30, 2021 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at April 1, 2021 |  | $ | 14,115 |  |  | $ | (568) |  |  | $ | 13,547 |
Other Comprehensive Income (Loss) Before Reclassification |  | 13,115 |  |  | — |  |  | 13,115 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (237) |  |  | — |  |  | (237) |
Net Current Period Other Comprehensive Income (Loss) |  | 12,878 |  |  | — |  |  | 12,878 |
Ending Balance at June 30, 2021 |  | $ | 26,993 |  |  | $ | (568) |  |  | $ | 26,425 |
June 30, 2021 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at January 1, 2021 |  | $ | 35,943 |  |  | $ | (568) |  |  | $ | 35,375 |
Other Comprehensive Income (Loss) Before Reclassification |  | (7,949) |  |  | — |  |  | (7,949) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (1,001) |  |  | — |  |  | (1,001) |
Net Current Period Other Comprehensive Income (Loss) |  | (8,950) |  |  | — |  |  | (8,950) |
Ending Balance at June 30, 2021 |  | $ | 26,993 |  |  | $ | (568) |  |  | $ | 26,425 |
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, 2022 and 2021:
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 |  | $ | 78 |  |  | Net Gains on Securities
|  | (16) |  |  | Income Tax Expense
|  | 62 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended June 30, 2022 |  | $ | 62 |  |  |
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 |  | $ | 450 |  |  | Net Gains on Securities
|  | (94) |  |  | Income Tax Expense
|  | 356 |  |  | Net of Tax
Total Reclassifications for the Six Months Ended June 30, 2022 |  | $ | 356 |  |  |
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 |  | $ | 300 |  |  | Net Gains on Securities
|  | (63) |  |  | Income Tax Expense
|  | 237 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended June 30, 2021 |  | $ | 237 |  |  |
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 |  | $ | 1,275 |  |  | Net Gains on Securities
|  | (268) |  |  | Income Tax Expense
|  | 1,007 |  |  | Net of Tax
Total Reclassifications for the Six Months Ended June 30, 2021 |  | $ | 1,007 |  |  |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI https://asc.fasb.org/extlink&oid=126968391&loc=SL7669686-108580 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 20 -URI https://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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