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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Investment Securities - Held to Maturity $ 2,096,727 $ 2,254,670
Net book balance 1,000  
Accrued interest receivable (AIR) $ 187,400 $ 133,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Assets. Other Assets.
Liability recorded for expected credit losses on unfunded commitments $ 68,500  
Other Assets    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accrued interest receivable for investment securities 38,500 $ 24,200
Other Liabilities    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liability recorded for expected credit losses on unfunded commitments $ 68,500 $ 45,300