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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 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 months ended March 31, 2021 and 2020, net of tax:
March 31, 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 |  | (21,058) |  |  | — |  |  | (21,058) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (770) |  |  | — |  |  | (770) |
Net Current Period Other Comprehensive Income (Loss) |  | (21,828) |  |  | — |  |  | (21,828) |
Ending Balance at March 31, 2021 |  | $ | 14,115 |  |  | $ | (568) |  |  | $ | 13,547 |
March 31, 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 |  | 13,718 |  |  | — |  |  | 13,718 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (463) |  |  | — |  |  | (463) |
Net Current Period Other Comprehensive Income (Loss) |  | 13,255 |  |  | — |  |  | 13,255 |
Ending Balance at March 31, 2020 |  | $ | 28,928 |  |  | $ | (568) |  |  | $ | 28,360 |
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, 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 |  | $ | 975 |  |  | Net Gains on Securities
|  | (205) |  |  | Income Tax Expense
|  | 770 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended March 31, 2021 |  | $ | 770 |  |  |
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 |  | $ | 590 |  |  | Net Gains on Securities
|  | (127) |  |  | Income Tax Expense
|  | 463 |  |  | Net of Tax
Total Reclassifications for the Three Months Ended March 31, 2020 |  | $ | 463 |  |  |

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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=121641772&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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