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Other Comprehensive Income (Loss) - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net gain on sale of securities $ 1,786 $ 94 $ 32
Other operating expenses (13,001) (9,096) (9,288)
Income taxes (7,017) (4,940) (5,683)
Net income 40,546 32,192 33,878
Reclassification out of Accumulated Other Comprehensive Loss [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Net income (189) (154) (98)
Unrealized Gains (Losses) 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 sale of securities 1 94 32
Income taxes   (20) (7)
Net income 1 74 25
Accumulated Defined Benefit Plans Adjustment, Actuarial Losses [Member] | Reclassification out of Accumulated Other Comprehensive Loss [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Other operating expenses (240) (289) (156)
Income taxes 50 61 33
Net income $ (190) $ (228) $ (123)