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Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, net of tax $ (161,515) $ (153,169)
Net unrealized loss on available for sale securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, before tax (243,669) (231,821)
Accumulated other comprehensive income, tax effect 72,036 68,534
Accumulated other comprehensive income, net of tax (171,633) (163,287)
Unfunded status of the supplemental retirement plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, before tax 13,527 13,527
Accumulated other comprehensive income, tax effect (3,999) (3,999)
Accumulated other comprehensive income, net of tax 9,528 9,528
Joint beneficiary agreement liability    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, before tax 590 590
Accumulated other comprehensive income, tax effect 0 0
Accumulated other comprehensive income, net of tax $ 590 $ 590