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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2019
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, 2019, 2018, and 2017:
| 2019 |  | 2018 |  | 2017
Unrealized holding gains (losses) on available for sale securities | $ | 13,732 |  |  | $ | (5,073 | ) |  | $ | (136 | )
Less reclassification adjustment for gains recognized in earnings | (148 | ) |  | 0 |  |  | (160 | )
Net unrealized gains (losses) | 13,584 |  |  | (5,073 | ) |  | (296 | )
Tax effect | (2,852 | ) |  | 1,066 |  |  | 104 |
Net-of-tax amount | 10,732 |  |  | (4,007 | ) |  | (192 | )
Unrealized holding gains (losses) on available for sale securities for which a portion of an other-than-temporary impairment has been recognized in earnings | 0 |  |  | 0 |  |  | 134 |
Less reclassification adjustment for gains recognized in earnings | 0 |  |  | 0 |  |  | (1,383 | )
Net unrealized gains | 0 |  |  | 0 |  |  | (1,249 | )
Tax effect | 0 |  |  | 0 |  |  | 437 |
Net-of-tax amount | 0 |  |  | 0 |  |  | (812 | )
Actuarial gain (loss) on postemployment health care plan | 518 |  |  | 404 |  |  | 808 |
Net amortization of transition obligation and actuarial gain | 23 |  |  | 84 |  |  | 192 |
Net unrealized gain (loss) on postemployment health care plan | 541 |  |  | 488 |  |  | 1,000 |
Tax effect | (113 | ) |  | (102 | ) |  | (175 | )
Net-of-tax amount | 428 |  |  | 386 |  |  | 825 |
Unrealized gain (loss) on interest rate swap | (347 | ) |  | (204 | ) |  | 10 |
Less reclassification adjustment for losses recognized in earnings | 63 |  |  | 164 |  |  | 288 |
Net unrealized gain (loss) | (284 | ) |  | (40 | ) |  | 298 |
Tax effect | 59 |  |  | 8 |  |  | (104 | )
Net-of-tax amount | (225 | ) |  | (32 | ) |  | 194 |
Other comprehensive income (loss) | $ | 10,935 |  |  | $ | (3,653 | ) |  | $ | 15 |
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, 2019, 2018, and 2017.
| 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 12/31/17 |  | 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 | )
| Balance 1/1/17 |  | Comprehensive Income (Loss) |  | Reclassification of Disproportionate Tax Effect |  | Balance 12/31/17
Unrealized gains (losses) on securities available for sale | $ | 1,393 |  |  | $ | (1,004 | ) |  | $ | 84 |  |  | $ | 473 |
Unrealized gain (loss) on postretirement benefits plan | (1,217 | ) |  | 825 |  |  | (298 | ) |  | (690 | )
Unrealized loss on interest rate swap | (297 | ) |  | 194 |  |  | (23 | ) |  | (126 | )
Total | $ | (121 | ) |  | $ | 15 |  |  | $ | (237 | ) |  | $ | (343 | )

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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118930883&loc=d3e526-108580 + Details
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