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Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss, net of tax $ (153,169) $ (193,905)
Net unrealized loss on available for sale securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), before tax (231,821) (290,549)
Tax effect 68,534 85,897
Accumulated other comprehensive loss, net of tax (163,287) (204,652)
Unfunded status of the supplemental retirement plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), before tax 13,527 13,901
Tax effect (3,999) (4,110)
Accumulated other comprehensive loss, net of tax 9,528 9,791
Joint beneficiary agreement liability, net of tax    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), before tax $ 590 $ 956