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Investments in Limited Partnerships - Additional Information (Detail)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
USD ($)
Partnership
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Schedule of Investments [Line Items]      
Unfunded equity commitments in other liabilities $ 14,233,959 $ 13,668,873  
Tax benefits including low-income housing and historic tax credits 59,589 23,035 $ 34,341
Partnerships losses and impairment $ 3,400 3,300 2,600
Number of limited partnerships held | Partnership 7    
Income related to equity method investments $ 242,260 122,044 158,873
Equity Method Investments [Member]      
Schedule of Investments [Line Items]      
Tax benefits including low-income housing and historic tax credits 3,100 3,200 2,500
Limited Liability Company [Member]      
Schedule of Investments [Line Items]      
Amount invested in partnerships 9,900 5,800  
Limited Liability Company [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]      
Schedule of Investments [Line Items]      
Partnership gains (losses) under equity method 3,600 (600) $ 600
Income related to equity method investments 3,800    
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Assets [Member]      
Schedule of Investments [Line Items]      
Amount invested in partnerships 27,900 31,400  
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Liabilities [Member]      
Schedule of Investments [Line Items]      
Unfunded equity commitments in other liabilities $ 12,500 $ 19,900