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Other Comprehensive Income - Components of Other Comprehensive Income and Related Tax Effects (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Equity [Abstract] |  |  |
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
Total other comprehensive (loss) income | $ 15 | $ (2,020) | $ 840

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- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities, attributable to parent entity. Excludes amounts related to other than temporary impairment (OTTI) loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569616-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=96868048&loc=SL4569643-111683 + Details
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