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Accumulated Other Comprehensive Income (Loss) - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Unrealized gains (losses) on available-for-sale securities $ 4 $ 4 $ 10 $ 2
Other operating expenses (2,828) (2,474) (7,450) (10,132)
Income tax expense (2,206) (1,966) (5,180) (5,647)
Net Income 11,112 9,642 27,279 29,564
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net Income (50) (60) (156) (191)
Accumulated Other Comprehensive Income (Loss) [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax expense     (2)  
Net Income 4 4 8 2
Accumulated Defined Benefit Plans Adjustment, Actuarial gains/(Losses) [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other operating expenses (69) (81) (208) (244)
Income tax expense 15 17 44 51
Net Income $ (54) $ (64) $ (164) $ (193)