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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017, 2016, and 2015:
|  | 2017 |  |  | 2016 |  |  | 2015 |
Unrealized holding losses on available for sale securities |  | $ | (136 | ) |  | $ | (1,838 | ) |  | $ | (623 | )
Less reclassification adjustment for gains recognized in earnings |  |  | (160 | ) |  |  | (83 | ) |  |  | (666 | )
Net unrealized losses |  |  | (296 | ) |  |  | (1,921 | ) |  |  | (1,289 | )
Tax effect |  |  | 104 |  |  |  | 672 |  |  |  | 452 |
Net-of-tax amount |  |  | (192 | ) |  |  | (1,249 | ) |  |  | (837 | )
Unrealized holding gains on available for sale securities for which a portion of an other-than-temporary impairment has been recognized in earnings |  |  | 134 |  |  |  | (442 | ) |  |  | 2,508 |
Less reclassification adjustment for gains recognized in earnings |  |  | (1,383 | ) |  |  | (922 | ) |  |  | 0 |
Net unrealized gains |  |  | (1,249 | ) |  |  | (1,364 | ) |  |  | 2,508 |
Tax effect |  |  | 437 |  |  |  | 477 |  |  |  | (878 | )
Net-of-tax amount |  |  | (812 | ) |  |  | (887 | ) |  |  | 1,630 |
Actuarial gain (loss) on postemployment health care plan |  |  | 808 |  |  |  | (282 | ) |  |  | (311 | )
Net amortization of transition obligation and actuarial gain |  |  | 192 |  |  |  | 184 |  |  |  | 173 |
Net unrealized gain (loss) on postemployment health care plan |  |  | 1,000 |  |  |  | (98 | ) |  |  | (138 | )
Tax effect |  |  | (175 | ) |  |  | 34 |  |  |  | 48 |
Net-of-tax amount |  |  | 825 |  |  |  | (64 | ) |  |  | (90 | )
Unrealized gain (loss) on interest rate swap |  |  | 10 |  |  |  | (63 | ) |  |  | (168 | )
Less reclassification adjustment for losses recognized in earnings |  |  | 288 |  |  |  | 340 |  |  |  | 378 |
Net unrealized gain |  |  | 298 |  |  |  | 277 |  |  |  | 210 |
Tax effect |  |  | (104 | ) |  |  | (97 | ) |  |  | (73 | )
Net-of-tax amount |  |  | 194 |  |  |  | 180 |  |  |  | 137 |
Other comprehensive income (loss) |  | $ | 15 |  |  | $ | (2,020 | ) |  | $ | 840 |
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, 2017, 2016, and 2015.
|  |  | Balance |  |  |  | Comprehensive |  |  |  | Reclassification of Disproportionate |  |  |  | Balance |
|  |  | 12/31/16 |  |  |  | Income (Loss) |  |  |  | Tax Effect |  |  |  | 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 |  |  |  | Comprehensive |  |  |  | Reclassification of Disproportionate |  |  |  | Balance |
|  |  | 12/31/15 |  |  |  | Income (Loss) |  |  |  | Tax Effect |  |  |  | 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 | )
|  |  | Balance |  |  |  | Comprehensive |  |  |  | Reclassification of Disproportionate |  |  |  | Balance |
|  |  | 1/1/15 |  |  |  | Income (Loss) |  |  |  | Tax Effect |  |  |  | 12/31/15 |
Unrealized gains (losses) on securities available for sale |  | $ | 2,736 |  |  | $ | 793 |  |  | $ | 0 |  |  | $ | 3,529 |
Unrealized gain (loss) on postretirement benefits plan |  |  | (1,063 | ) |  |  | (90 | ) |  |  | 0 |  |  |  | (1,153 | )
Unrealized loss on interest rate swap |  |  | (614 | ) |  |  | 137 |  |  |  | 0 |  |  |  | (477 | )
Total |  | $ | 1,059 |  |  | $ | 840 |  |  | $ | 0 |  |  | $ | 1,899 |

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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