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Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive loss, net of tax $ (152,462) $ (153,169)
Net unrealized loss on available for sale securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), before tax (233,648) (231,821)
Tax effect 69,075 68,534
Accumulated other comprehensive loss, net of tax (164,573) (163,287)
Unfunded status of the supplemental retirement plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), before tax 16,085 13,527
Tax effect (4,756) (3,999)
Accumulated other comprehensive loss, net of tax 11,329 9,528
Joint beneficiary agreement liability, net of tax    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income (loss), before tax $ 782 $ 590