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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2021
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, 2021 and 2020, net of tax:
September 30, 2021 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at July 1, 2021 |  | $ | 26,993 |  |  | $ | (568) |  |  | $ | 26,425 |
Other Comprehensive Income (Loss) Before Reclassification |  | (14,989) |  |  | — |  |  | (14,989) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (172) |  |  | — |  |  | (172) |
Net Current Period Other Comprehensive Income (Loss) |  | (15,161) |  |  | — |  |  | (15,161) |
Ending Balance at September 30, 2021 |  | $ | 11,832 |  |  | $ | (568) |  |  | $ | 11,264 |
September 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 |  | (22,932) |  |  | — |  |  | (22,932) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (1,179) |  |  | — |  |  | (1,179) |
Net Current Period Other Comprehensive Income (Loss) |  | (24,111) |  |  | — |  |  | (24,111) |
Ending Balance at September 30, 2021 |  | $ | 11,832 |  |  | $ | (568) |  |  | $ | 11,264 |
September 30, 2020 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at July 1, 2020 |  | $ | 31,717 |  |  | $ | (568) |  |  | $ | 31,149 |
Other Comprehensive Income (Loss) Before Reclassification |  | 74 |  |  | — |  |  | 74 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (480) |  |  | — |  |  | (480) |
Net Current Period Other Comprehensive Income (Loss) |  | (406) |  |  | — |  |  | (406) |
Ending Balance at September 30, 2020 |  | $ | 31,311 |  |  | $ | (568) |  |  | $ | 30,743 |
September 30, 2020 |  | Unrealized Gains and Losses on Available-for-Sale Securities |  | Postretirement Benefit Items |  | Total
Beginning Balance at January 1, 2020 |  | $ | 15,673 |  |  | $ | (568) |  |  | $ | 15,105 |
Other Comprehensive Income (Loss) Before Reclassification |  | 17,364 |  |  | — |  |  | 17,364 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (1,726) |  |  | — |  |  | (1,726) |
Net Current Period Other Comprehensive Income (Loss) |  | 15,638 |  |  | — |  |  | 15,638 |
Ending Balance at September 30, 2020 |  | $ | 31,311 |  |  | $ | (568) |  |  | $ | 30,743 |
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, 2021 and 2020:
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 |  | $ | 218 |  |  | Net Gains on Securities
|  | (46) |  |  | Income Tax Expense
|  | 172 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended September 30, 2021 |  | $ | 172 |  |  |
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 |  | $ | 1,493 |  |  | Net Gains on Securities
|  | (314) |  |  | Income Tax Expense
|  | 1,179 |  |  | Net of Tax
Total Reclassifications for the Nine Months Ended September 30, 2021 |  | $ | 1,179 |  |  |
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 |  | $ | 607 |  |  | Net Gains on Securities
|  | (127) |  |  | Income Tax Expense
|  | 480 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended September 30, 2020 |  | $ | 480 |  |  |
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 |  | $ | 2,190 |  |  | Net Gains on Securities
|  | (464) |  |  | Income Tax Expense
|  | 1,726 |  |  | Net of Tax
Total Reclassifications for the Nine Months Ended September 30, 2020 |  | $ | 1,726 |  |  |

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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 http://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 http://asc.fasb.org/extlink&oid=124509347&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 http://asc.fasb.org/extlink&oid=118261656&loc=d3e32211-110900 + Details
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