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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Components of Other Comprehensive Income and Related Tax Effects | Other comprehensive income components and related tax effects were as follows for the years ended December 31, 2020, December 31, 2019, and December 31, 2018:
| December 31, 2020 |  | December 31, 2019 |  | December 31, 2018
Unrealized holding gains (losses) on available for sale securities | $ | 12,494 |  |  | $ | 13,732 |  |  | $ | (5,073) |
Less reclassification adjustment for gains recognized in earnings | (2,190) |  |  | (148) |  |  | 0 |
Net unrealized gains (losses) | 10,304 |  |  | 13,584 |  |  | (5,073) |
Tax effect | (2,164) |  |  | (2,852) |  |  | 1,066 |
Net-of-tax amount | 8,140 |  |  | 10,732 |  |  | (4,007) |
Actuarial gain (loss) on postemployment health care plan | 277 |  |  | 518 |  |  | 404 |
Net amortization of transition obligation and actuarial gain | 0 |  |  | 23 |  |  | 84 |
Net unrealized gain (loss) on postemployment health care plan | 277 |  |  | 541 |  |  | 488 |
Tax effect | (58) |  |  | (113) |  |  | (102) |
Net-of-tax amount | 219 |  |  | 428 |  |  | 386 |
Unrealized gain (loss) on interest rate swap | (508) |  |  | (347) |  |  | (204) |
Less reclassification adjustment for losses recognized in earnings | 224 |  |  | 63 |  |  | 164 |
Net unrealized gain (loss) | (284) |  |  | (284) |  |  | (40) |
Tax effect | 60 |  |  | 59 |  |  | 8 |
Net-of-tax amount | (224) |  |  | (225) |  |  | (32) |
Other comprehensive income (loss) | $ | 8,135 |  |  | $ | 10,935 |  |  | $ | (3,653) |
Summary of Change in Accumulated Other Comprehensive Income (Loss) | The following is a summary of the change in the accumulated other comprehensive income (loss) balance, net of tax, for the years ended December 31, 2020, December 31, 2019, and December 31, 2018.
| Balance 12/31/19 |  | Comprehensive Income (Loss) |  | Reclassification of Disproportionate Tax Effect |  | Balance 12/31/20
Unrealized gains (losses) on securities available for sale | $ | 7,198 |  |  | $ | 8,140 |  |  | $ | 0 |  |  | $ | 15,338 |
Unrealized gain (loss) on postretirement benefits plan | 124 |  |  | 219 |  |  | 0 |  |  | 343 |
Unrealized loss on interest rate swap | (383) |  |  | (224) |  |  | 0 |  |  | (607) |
Total | $ | 6,939 |  |  | $ | 8,135 |  |  | $ | 0 |  |  | $ | 15,074 |
| Balance 12/31/18 |  | Comprehensive Income (Loss) |  | Reclassification of Disproportionate Tax Effect |  | Balance 12/31/19
Unrealized gains (losses) on securities available for sale | $ | (3,534) |  |  | $ | 10,732 |  |  | $ | 0 |  |  | $ | 7,198 |
Unrealized gain (loss) on postretirement benefits plan | (304) |  |  | 428 |  |  | 0 |  |  | 124 |
Unrealized loss on interest rate swap | (158) |  |  | (225) |  |  | 0 |  |  | (383) |
Total | $ | (3,996) |  |  | $ | 10,935 |  |  | $ | 0 |  |  | $ | 6,939 |
| Balance 1/1/18 |  | Comprehensive Income (Loss) |  | Reclassification of Disproportionate Tax Effect |  | Balance 12/31/18
Unrealized gains (losses) on securities available for sale | $ | 473 |  |  | $ | (4,007) |  |  | $ | 0 |  |  | $ | (3,534) |
Unrealized gain (loss) on postretirement benefits plan | (690) |  |  | 386 |  |  | 0 |  |  | (304) |
Unrealized loss on interest rate swap | (126) |  |  | (32) |  |  | 0 |  |  | (158) |
Total | $ | (343) |  |  | $ | (3,653) |  |  | $ | 0 |  |  | $ | (3,996) |

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