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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2018
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, 2018, 2017, and 2016:
| 2018 |  | 2017 |  | 2016
Unrealized holding losses on available for sale securities | $ | (5,073 | ) |  | $ | (136 | ) |  | $ | (1,838 | )
Less reclassification adjustment for gains recognized in earnings | 0 |  |  | (160 | ) |  | (83 | )
Net unrealized losses | (5,073 | ) |  | (296 | ) |  | (1,921 | )
Tax effect | 1,066 |  |  | 104 |  |  | 672 |
Net-of-tax amount | (4,007 | ) |  | (192 | ) |  | (1,249 | )
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 |  |  | 134 |  |  | (442 | )
Less reclassification adjustment for gains recognized in earnings | 0 |  |  | (1,383 | ) |  | (922 | )
Net unrealized gains | 0 |  |  | (1,249 | ) |  | (1,364 | )
Tax effect | 0 |  |  | 437 |  |  | 477 |
Net-of-tax amount | 0 |  |  | (812 | ) |  | (887 | )
Actuarial gain (loss) on postemployment health care plan | 404 |  |  | 808 |  |  | (282 | )
Net amortization of transition obligation and actuarial gain | 84 |  |  | 192 |  |  | 184 |
Net unrealized gain (loss) on postemployment health care plan | 488 |  |  | 1,000 |  |  | (98 | )
Tax effect | (102 | ) |  | (175 | ) |  | 34 |
Net-of-tax amount | 386 |  |  | 825 |  |  | (64 | )
Unrealized gain (loss) on interest rate swap | (204 | ) |  | 10 |  |  | (63 | )
Less reclassification adjustment for losses recognized in earnings | 164 |  |  | 288 |  |  | 340 |
Net unrealized gain (loss) | (40 | ) |  | 298 |  |  | 277 |
Tax effect | 8 |  |  | (104 | ) |  | (97 | )
Net-of-tax amount | (32 | ) |  | 194 |  |  | 180 |
Other comprehensive income (loss) | $ | (3,653 | ) |  | $ | 15 |  |  | $ | (2,020 | )
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, 2018, 2017, and 2016.
| 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 12/31/16 |  | 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 | )
| Balance 1/1/16 |  | Comprehensive Income (Loss) |  | Reclassification of Disproportionate Tax Effect |  | Balance 12/31/16
Unrealized gains (losses) on securities available for sale | $ | 3,529 |  |  | $ | (2,136 | ) |  | $ | 0 |  |  | $ | 1,393 |
Unrealized gain (loss) on postretirement benefits plan | (1,153 | ) |  | (64 | ) |  | 0 |  |  | (1,217 | )
Unrealized loss on interest rate swap | (477 | ) |  | 180 |  |  | 0 |  |  | (297 | )
Total | $ | 1,899 |  |  | $ | (2,020 | ) |  | $ | 0 |  |  | $ | (121 | )

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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=114867106&loc=d3e526-108580 + Details
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