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Accumulated Other Comprehensive Income - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net gain (loss) on sale of securities $ 4 $ 92 $ 2 $ 92
Other operating expenses (2,677) (2,197) (10,741) (7,115)
Income tax expense (1,763) (1,133) (5,038) (3,134)
Net Income 9,642 7,682 29,564 22,019
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net Income (60) 16 (191) (98)
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   (19)   (19)
Net Income 4 73 2 73
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 (81) (72) (244) (217)
Income tax expense 17 15 51 46
Net Income $ (64) $ (57) $ (193) $ (171)