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Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, net of tax $ (130,364) $ (152,462)
Net unrealized loss on available for sale securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, before tax (202,276) (233,648)
Accumulated other comprehensive income, tax effect 59,801 69,075
Accumulated other comprehensive income, net of tax (142,475) (164,573)
Unfunded status of the supplemental retirement plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, before tax 16,085 16,085
Accumulated other comprehensive income, tax effect (4,756) (4,756)
Accumulated other comprehensive income, net of tax 11,329 11,329
Joint beneficiary agreement liability    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, before tax 782 782
Accumulated other comprehensive income, tax effect 0 0
Accumulated other comprehensive income, net of tax $ 782 $ 782