v3.26.1
Securities - Narrative (Details)
 3 Months Ended
Mar. 31, 2026
USD ($)
chargeoff
security
Mar. 31, 2025
USD ($)
chargeoff
Dec. 31, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Marketable securities $ 1,176,852,000   $ 999,267,000
Debt securities, accrued interest 4,900,000   3,000,000.0
Held to maturity, allowance for credit losses $ 150,000   $ 150,000
Number of debt securities with unrealized losses | security 300    
Unrealized losses on debt securities in continuous loss position as percentage of total individual securities' amortized cost basis (as a percent) 6.60%    
Unrealized losses on debt securities in continuous loss position as percentage of amortized cost basis of investment securities portfolio (as a percent) 5.40%    
Number of debt securities in continuous loss position for over 12 months | security 118    
Debt securities in a continuous loss position for over 12 months, amortized cost basis $ 342,400,000    
Debt securities in a continuous loss position for over 12 months, unrealized loss $ 58,500,000    
Number of held to maturity corporate security with a credit related impairment loss | security 0    
Provision for credit losses $ 2,625,000 $ 14,548,000  
Corporate debt securities      
Debt Securities, Available-for-sale [Line Items]      
Number of charge-offs | chargeoff 0 0  
Held-to-Maturity and Available-for-Sale Securities      
Debt Securities, Available-for-sale [Line Items]      
Provision for credit losses $ 0 $ 0  
Deposits      
Debt Securities, Available-for-sale [Line Items]      
Marketable securities 740,300,000    
Debt securities, available-for-sale and held-to-maturity, fair value $ 688,400,000