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Other Comprehensive Income - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gain on securities available for sale | $ 10 | $ 6 | $ 14 | $ 6
Other operating expenses | (2,747) | (2,102) | (5,224) | (3,860)
Income tax expense | (1,546) | (214) | (3,430) | (1,408)
Net Income | 8,661 | 3,014 | 18,330 | 10,003
Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net Income | (108) | (108) | (221) | (221)
Accumulated Defined Benefit Plans Adjustment, Actuarial gains/(Losses) [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Other operating expenses | (147) | (143) | (294) | (286)
Income tax expense | 31 | 30 | 62 | 60
Net Income | (116) | (113) | (232) | (226)
Unrealized gains on available-for-sale securities [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member] |  |  |  |
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] |  |  |  |
Net gain on securities available for sale | 10 | 6 | 14 | 6
Income tax expense | (2) | (1) | (3) | (1)
Net Income | $ 8 | $ 5 | $ 11 | $ 5

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