v3.25.3
Securities - Narrative (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2025
USD ($)
security
Sep. 30, 2024
USD ($)
Sep. 30, 2025
USD ($)
chargeoff
security
Sep. 30, 2024
USD ($)
chargeoff
Dec. 31, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Marketable securities $ 696,748,000   $ 696,748,000   $ 602,719,000
Debt securities, accrued interest 3,500,000   3,500,000   1,400,000
Held to maturity, allowance for credit losses $ 150,000   $ 150,000   $ 150,000
Number of debt securities with unrealized losses | security 149   149    
Unrealized losses on debt securities in continuous loss position as percentage of total individual securities' amortized cost basis (as a percent) 14.00%   14.00%    
Unrealized losses on debt securities in continuous loss position as percentage of amortized cost basis of investment securities portfolio (as a percent) 8.50%   8.50%    
Number of debt securities in continuous loss position for over 12 months | security 132   132    
Debt securities in a continuous loss position for over 12 months, amortized cost basis $ 368,700,000   $ 368,700,000    
Debt securities in a continuous loss position for over 12 months, unrealized loss $ 58,900,000   $ 58,900,000    
Number of held to maturity corporate security with a credit related impairment loss | security 0   0    
Provision for credit losses $ 47,933,000 $ 4,904,000 $ 79,091,000 $ 14,013,000  
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 512,500,000   512,500,000    
Debt securities, available-for-sale and held-to-maturity, fair value $ 463,600,000   $ 463,600,000