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Other Comprehensive Income - Components of Other Comprehensive Income and Related Tax Effects (Detail) - USD ($)
$ in Thousands
 12 Months Ended
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