v3.26.1
Fair Value Measurements - Narrative (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Total credit-related financial instruments with off-balance sheet risk $ 13,252,112   $ 13,176,616
Total write-ups 400    
Total write-downs due to impairment 500    
Proceeds from sales of alternative investments 6,975 $ 9,536  
Gain on sale of investments 3,747 $ 5,748  
Loans transferred to held-for-sale 12,700   12,700
Amortized cost of consumer loans 8,200    
Re-sign broker dealers | Maximum      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Contingent consideration 35,000    
Fair Value, Nonrecurring      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Rabbi Trusts 1,200   1,500
Carrying amount of alternative investments 3,300    
Proceeds from sales of alternative investments 7,000    
Gain on sale of investments 3,700    
Rabbi Trust      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Rabbi Trusts 12,800   11,200
Alternative investments      
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]      
Investments held in Rabbi Trusts 56,200   52,200
Equity investment, carrying amount 0   0
Alternative investments, carrying amount 69,000   57,500
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 66,300   86,100
Alternative investments measured at fair value $ 2,800   $ 7,500