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Accumulated Other Comprehensive Loss - Amounts Reclassified Out of Each Component of Accumulated Other Comprehensive Loss (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Unrealized gains (losses) on available-for-sale securities     $ 0 $ 0
Other operating expenses $ (3,206,000) $ (2,450,000) (6,404,000) (4,622,000)
Income tax expense (1,680,000) (1,423,000) (4,208,000) (2,974,000)
Net Income 10,034,000 7,701,000 22,922,000 16,167,000
Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net Income 0 (50,000) 0 (105,000)
Unrealized Gains (Losses) on Available-for-Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income (Loss) [Member]        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Unrealized gains (losses) on available-for-sale securities 0 6,000 0 6,000
Income tax expense 0 (1,000) 0 (1,000)
Net Income 0 5,000 0 5,000
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 0 (70,000) 0 (139,000)
Income tax expense 0 15,000 0 29,000
Net Income $ (0) $ (55,000) $ 0 $ (110,000)