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Investments in Limited Partnerships - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
Partnership
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Schedule of Investments [Line Items]      
Unfunded equity commitments in other liabilities $ 14,505,243 $ 14,233,959  
Tax benefits including low-income housing and historic tax credits 44,288 59,589 $ 23,035
Partnerships losses and impairment $ 3,600 3,400 3,300
Number of limited partnerships held | Partnership 5    
(Losses) gains related to equity method investments $ 192,113 242,260 122,044
Equity Method Investments [Member]      
Schedule of Investments [Line Items]      
Tax benefits including low-income housing and historic tax credits 3,500 3,100 3,200
Limited Liability Company [Member]      
Schedule of Investments [Line Items]      
Amount invested in partnerships 3,300 9,900  
Limited Liability Company [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]      
Schedule of Investments [Line Items]      
Partnership (loss) income under equity method (900) 3,600 $ (600)
(Losses) gains related to equity method investments (1,000) 3,800  
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Assets [Member]      
Schedule of Investments [Line Items]      
Amount invested in partnerships 34,200 27,900  
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Liabilities [Member]      
Schedule of Investments [Line Items]      
Unfunded equity commitments in other liabilities $ 15,100 $ 12,500