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Accumulated Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | The activity in accumulated other comprehensive income (loss) is presented in the tables below (in thousands). The activity is shown net of tax, which is calculated using a combined Federal and state income tax rate approximating 24% for 2020 and 23% for 2019.
| Accumulated Other Comprehensive Income (Loss)
|  | Unrealized |
|  | Gains (Losses) on |
| Defined Benefit | Securities |
| Pension Plans | Available-for-Sale | Total
Balance at December 31, 2018 | $ | (5,871) |  | $ | (8,611) |  | $ | (14,482) |
Other comprehensive (loss) income before reclassifications | (399) |  | 20,775 |  | 20,376 |
Amounts reclassified from other comprehensive income (loss) | — |  | (54) |  | (54) |
| (399) |  | 20,721 |  | 20,322 |
Balance at December 31, 2019 | $ | (6,270) |  | $ | 12,110 |  | $ | 5,840 |
Other comprehensive income before reclassifications | 609 |  | 23,643 |  | 24,252 |
Amounts reclassified from other comprehensive income (loss) | — |  | (47) |  | (47) |
Reclassification of unrealized gains on held-to-maturity securities to available-for-sale | — |  | 1,188 |  | 1,188 |
| 609 |  | 24,784 |  | 25,393 |
Balance at December 31, 2020 | $ | (5,661) |  | $ | 36,894 |  | $ | 31,233 |
Schedule of Amounts Reclassified from Accumulated Other Comprehensive Income |
| Amounts reclassified from Other Comprehensive Income (Loss) | Affected line item
| December 31, | in the Consolidated
| 2020 | 2019 | 2018 | Statements of Income
Securities available-for-sale: |  |  |  |
Net securities gains reclassified into earnings | $ | (62) |  | $ | (69) |  | $ | — |  | Net gains on sale of investment securities
Related income tax expense | 15 |  | 15 |  | — |  | Income tax expense
Net effect on accumulated other comprehensive income (loss) | $ | (47) |  | $ | (54) |  | $ | — |  |
Defined benefit pension plans: |  |  |  |
Gain on termination of defined benefit plan | $ | — |  | $ | — |  | $ | 163 |  | Other expenses
Related income tax expense | — |  | — |  | (38) |  | Income tax expense
Net effect on accumulated other comprehensive income (loss) | $ | — |  | $ | — |  | $ | 125 |  |

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