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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 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Unrealized gains (losses) on available-for-sale securities $ 6 $ (1) $ 6 $ (2)
Other operating expenses (2,450) (5,578) (4,622) (7,658)
Income tax expense (1,423) (1,438) (2,974) (3,681)
Net Income 7,701 9,164 16,167 19,922
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net Income (50) (65) (105) (131)
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 (1)   (1)  
Net Income 5 (1) 5 (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 (70) (81) (139) (163)
Income tax expense 15 17 29 34
Net Income $ (55) $ (64) $ (110) $ (129)