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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, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Equity [Abstract] |  |  |
Unrealized holding (losses) gains on available for sale securities | $ (1,838) | $ (623) | $ 16,141
Less reclassification adjustment for gains recognized in earnings | (1,005) | (666) | (429)
Net unrealized (losses) gains | (1,921) | (1,289) | 15,712
Tax effect | 672 | 452 | (5,498)
Net-of-tax amount | (1,249) | (837) | 10,214
Unrealized holding gains (losses) on available for sale securities for which a portion of an other-than-temporary impairment has been recognized in earnings | (442) | 2,508 | 244
Less reclassification adjustment for gains recognized in earnings | (922) | 0 | 0
Net unrealized gains (losses) | (1,364) | 2,508 | 244
Tax effect | 477 | (878) | (86)
Net-of-tax amount | (887) | 1,630 | 158
Actuarial loss on postemployment health care plan | (282) | (311) | (117)
Net amortization of transition obligation and actuarial gain | 184 | 173 | 149
Net unrealized loss on postemployment health care plan | (98) | (138) | 32
Tax effect | 34 | 48 | (11)
Net-of-tax amount | (64) | (90) | 21
Unrealized loss on interest rate swap | (63) | (168) | (213)
Less reclassification adjustment for losses recognized in earnings | 340 | 378 | 384
Net unrealized gain | 277 | 210 | 171
Tax effect | (97) | (73) | (60)
Net-of-tax amount | 180 | 137 | 111
Total other comprehensive (loss) income | $ (2,020) | $ 840 | $ 10,504

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