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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Comprehensive Income (Loss) | The before and after-tax amounts allocated to each component of other comprehensive income (loss) are presented in the following table. Reclassification adjustments related to securities available for sale are included in net gain (loss) on securities transactions in the accompanying consolidated statements of income. Reclassification adjustments related to defined-benefit post-retirement benefit plans are included in the computation of net periodic pension expense (see Note 11 – Defined Benefit Plans).
| Three Months Ended September 30, 2023 |  | Three Months Ended September 30, 2022
| Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount |  | Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount
Securities available for sale and transferred securities: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gain/loss during the period | $ | (600,441) |  |  | $ | (126,092) |  |  | $ | (474,349) |  |  | $ | (829,324) |  |  | $ | (174,158) |  |  | $ | (655,166) |
Change in net unrealized gain on securities transferred to held to maturity | (164) |  |  | (35) |  |  | (129) |  |  | (174) |  |  | (36) |  |  | (138) |
Reclassification adjustment for net (gains) losses included in net income | (12) |  |  | (3) |  |  | (9) |  |  | — |  |  | — |  |  | — |
Total securities available for sale and transferred securities | (600,617) |  |  | (126,130) |  |  | (474,487) |  |  | (829,498) |  |  | (174,194) |  |  | (655,304) |
Defined-benefit post-retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic cost (benefit) | 869 |  |  | 182 |  |  | 687 |  |  | 741 |  |  | 156 |  |  | 585 |
Total defined-benefit post-retirement benefit plans | 869 |  |  | 182 |  |  | 687 |  |  | 741 |  |  | 156 |  |  | 585 |
Total other comprehensive income (loss) | $ | (599,748) |  |  | $ | (125,948) |  |  | $ | (473,800) |  |  | $ | (828,757) |  |  | $ | (174,038) |  |  | $ | (654,719) |
| Nine Months Ended September 30, 2023 |  | Nine Months Ended September 30, 2022
| Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount |  | Before Tax Amount |  | Tax Expense, (Benefit) |  | Net of Tax Amount
Securities available for sale and transferred securities: |  |  |  |  |  |  |  |  |  |  |
Change in net unrealized gain/loss during the period | $ | (547,035) |  |  | $ | (114,877) |  |  | $ | (432,158) |  |  | $ | (2,376,642) |  |  | $ | (499,095) |  |  | $ | (1,877,547) |
Change in net unrealized gain on securities transferred to held to maturity | (486) |  |  | (102) |  |  | (384) |  |  | (572) |  |  | (120) |  |  | (452) |
Reclassification adjustment for net (gains) losses included in net income | (66) |  |  | (14) |  |  | (52) |  |  | — |  |  | — |  |  | — |
Total securities available for sale and transferred securities | (547,587) |  |  | (114,993) |  |  | (432,594) |  |  | (2,377,214) |  |  | (499,215) |  |  | (1,877,999) |
Defined-benefit post-retirement benefit plans: |  |  |  |  |  |  |  |  |  |  |
Reclassification adjustment for net amortization of actuarial gain/loss included in net income as a component of net periodic expense (benefit) | 2,609 |  |  | 548 |  |  | 2,061 |  |  | 2,223 |  |  | 467 |  |  | 1,756 |
Total defined-benefit post-retirement benefit plans | 2,609 |  |  | 548 |  |  | 2,061 |  |  | 2,223 |  |  | 467 |  |  | 1,756 |
Total other comprehensive income (loss) | $ | (544,978) |  |  | $ | (114,445) |  |  | $ | (430,533) |  |  | $ | (2,374,991) |  |  | $ | (498,748) |  |  | $ | (1,876,243) |
Schedule of Accumulated Other Comprehensive Income (Loss) | Activity in accumulated other comprehensive income (loss), net of tax, was as follows:
| Securities Available For Sale |  | Defined Benefit Plans |  | Accumulated Other Comprehensive Income
Balance at January 1, 2023 | $ | (1,313,791) |  |  | $ | (34,503) |  |  | $ | (1,348,294) |
Other comprehensive income (loss) before reclassifications | (432,542) |  |  | — |  |  | (432,542) |
Reclassification of amounts included in net income | (52) |  |  | 2,061 |  |  | 2,009 |
Net other comprehensive income (loss) during period | (432,594) |  |  | 2,061 |  |  | (430,533) |
Balance at September 30, 2023 | $ | (1,746,385) |  |  | $ | (32,442) |  |  | $ | (1,778,827) |
Balance at January 1, 2022 | $ | 380,209 |  |  | $ | (32,891) |  |  | $ | 347,318 |
Other comprehensive income (loss) before reclassifications | (1,877,999) |  |  | — |  |  | (1,877,999) |
Reclassification of amounts included in net income | — |  |  | 1,756 |  |  | 1,756 |
Net other comprehensive income (loss) during period | (1,877,999) |  |  | 1,756 |  |  | (1,876,243) |
Balance at September 30, 2022 | $ | (1,497,790) |  |  | $ | (31,135) |  |  | $ | (1,528,925) |

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