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Investments in Limited Partnerships - Additional Information (Detail)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
Partnership
Sep. 30, 2024
USD ($)
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Schedule of Investments [Line Items]            
Unfunded equity commitments in other liabilities $ 23,401,515   $ 23,401,515     $ 15,894,017
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Cash Flows [Extensible Enumeration] Tax benefits including low-income housing and historic tax credits Tax benefits including low-income housing and historic tax credits Tax benefits including low-income housing and historic tax credits Tax benefits including low-income housing and historic tax credits    
Investment Program, Proportional Amortization Method, Applied, Amortization Expense, Statement of Income or Comprehensive Income [Extensible Enumeration] Tax benefits including low-income housing and historic tax credits Tax benefits including low-income housing and historic tax credits Tax benefits including low-income housing and historic tax credits Tax benefits including low-income housing and historic tax credits    
Partnerships losses and impairment $ 3,000 $ 1,200 $ 7,900 $ 3,500    
Number of limited partnerships held | Partnership     3      
Equity Method Investments [Member]            
Schedule of Investments [Line Items]            
Income tax credits and adjustments           4,300
Equity Method Investments [Member] | Forecast [Member]            
Schedule of Investments [Line Items]            
Income tax credits and adjustments         $ 10,000  
Limited Liability Company [Member]            
Schedule of Investments [Line Items]            
Amount invested in partnerships 4,000   $ 4,000     2,900
Limited Liability Company [Member] | Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member]            
Schedule of Investments [Line Items]            
Partnership income (loss) under equity method 21 $ 5 104 $ (5)    
Variable Interest Entity, Not Primary Beneficiary [Member]            
Schedule of Investments [Line Items]            
Unfunded equity commitments in other liabilities 28,900   28,900     19,000
Variable Interest Entity, Not Primary Beneficiary [Member] | Other Assets [Member]            
Schedule of Investments [Line Items]            
Amount invested in partnerships $ 76,800   $ 76,800     $ 38,200