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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassifications, before tax $ 284 $ 0 $ 0
Other comprehensive income (loss) 40,736 (194,886) (11,299)
Net unrealized loss on available for sale securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
OCI, before reclassifications, before tax 58,444 (290,157) (19,575)
Reclassifications, before tax 284 0 0
OCI, after reclassifications, before tax 58,728 (290,157) (19,575)
Tax effect (17,363) 85,781 5,787
Other comprehensive income (loss) 41,365 (204,376) (13,788)
Unfunded status of the supplemental retirement plans      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
OCI, before reclassifications, before tax 81 11,522 3,497
Reclassifications, before tax (455) (20) 196
OCI, after reclassifications, before tax (374) 11,502 3,693
Tax effect 111 (3,401) (1,091)
Other comprehensive income (loss) (263) 8,101 2,602
Amortization of prior service cost      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassifications, before tax 0 (28) (58)
Amortization of actuarial losses      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Reclassifications, before tax (455) 8 254
Joint beneficiary agreement liability, net of tax      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
OCI, before reclassifications, before tax (366) 1,389 (113)
Tax effect 0 0 0
OCI, before reclassifications, net of tax $ (366) $ 1,389 $ (113)