v3.26.1
Securities - Narrative (Details)
 3 Months Ended 6 Months Ended
Jun. 30, 2026
USD ($)
security
Jun. 30, 2025
USD ($)
Jun. 30, 2026
USD ($)
security
chargeoff
Jun. 30, 2025
USD ($)
chargeoff
Dec. 31, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Marketable securities $ 1,213,961,000   $ 1,213,961,000   $ 999,267,000
Debt securities, accrued interest 4,000,000.0   4,000,000.0   3,000,000.0
Held to maturity, allowance for credit losses $ 150,000   $ 150,000   $ 150,000
Number of debt securities with unrealized losses | security 331   331    
Unrealized losses on debt securities in continuous loss position as percentage of total individual securities' amortized cost basis (as a percent) 6.30%   6.30%    
Unrealized losses on debt securities in continuous loss position as percentage of amortized cost basis of investment securities portfolio (as a percent) 5.70%   5.70%    
Number of debt securities in continuous loss position for over 12 months | security 117   117    
Debt securities in a continuous loss position for over 12 months, amortized cost basis $ 342,600,000   $ 342,600,000    
Debt securities in a continuous loss position for over 12 months, unrealized loss $ 59,000,000.0   $ 59,000,000.0    
Number of held to maturity corporate security with a credit related impairment loss | security 0   0    
Provision for credit losses $ 2,625,000 $ 16,610,000 $ 5,250,000 $ 31,158,000  
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 779,700,000   779,700,000    
Debt securities, available-for-sale and held-to-maturity, fair value $ 728,100,000   $ 728,100,000