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Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, net of tax $ (181,376) $ (193,905)
Net unrealized gain on available for sale securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, before tax (272,761) (290,549)
Accumulated other comprehensive income, tax effect 80,638 85,897
Accumulated other comprehensive income, net of tax (192,123) (204,652)
Unfunded status of the supplemental retirement plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, before tax 13,901 13,901
Accumulated other comprehensive income, tax effect (4,110) (4,110)
Accumulated other comprehensive income, net of tax 9,791 9,791
Joint beneficiary agreement liability    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Accumulated other comprehensive income, before tax 956 956
Accumulated other comprehensive income, tax effect 0 0
Accumulated other comprehensive income, net of tax $ 956 $ 956