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Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) and Related Tax Effects (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other comprehensive income (loss) $ (78,339) $ (9,319)
Net unrealized gain on available for sale securities    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
OCI, before reclassifications, before tax (111,302) (12,337)
Reclassifications, before tax 0 0
OCI, after reclassifications, before tax (111,302) (12,337)
Tax effect 32,905 3,647
Other comprehensive income (loss) (78,397) (8,690)
Unfunded status of the supplemental retirement plans    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
OCI, before reclassifications, before tax 63 (49)
Reclassifications, before tax (5) 49
OCI, after reclassifications, before tax 58 0
Tax effect 0 0
Other comprehensive income (loss) 58 0
Amortization of prior service cost    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassifications, before tax (7) (14)
Amortization of actuarial losses    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Reclassifications, before tax 2 63
Joint beneficiary agreement liability    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
OCI, before reclassifications, before tax 0 (629)
Tax effect 0 0
OCI, before reclassifications, net of tax $ 0 $ (629)