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Fair Value Measurements - Narrative (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Broker dealer deposit program fair value $ 2,500,000    
Total credit-related financial instruments with off-balance sheet risk 13,176,616 $ 12,237,964  
Total write-ups 2,000    
Total write-downs due to impairment 500    
Proceeds from sales of alternative investments 13,441 19,588 $ 0
Gains on sale 8,806 14,763 $ 0
Loans transferred to held-for-sale 12,700 27,300  
Amortized cost of consumer loans 9,000    
Fair Value, Nonrecurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Rabbi Trust 1,500 400  
Carrying amount of alternative investments 4,600    
Proceeds from sales of alternative investments 13,400    
Gains on sale 8,800    
Re-sign broker dealers      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration   182  
Re-sign broker dealers | Maximum      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration 35,000 207  
Rabbi Trust      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Rabbi Trust 11,200 9,200  
Alternative investments      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Rabbi Trust 52,200 30,100  
Readily determinable fair value proceeds   1,200  
Write-down of TDR's   300  
Alternative investments, carrying amount 57,500 43,400  
Alternative investments | Fair Value, Nonrecurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total credit-related financial instruments with off-balance sheet risk 86,100 61,500  
Alternative investments measured at fair value $ 7,500 $ 8,300