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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