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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Investment Securities - Held to Maturity $ 2,007,249 $ 2,048,030
Net book balance 1,000  
Accrued interest receivable (AIR) $ 189,200 $ 186,500
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 $ 69,200  
Other Assets    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accrued interest receivable for investment securities 42,000 $ 38,900
Other Liabilities    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liability recorded for expected credit losses on unfunded commitments $ 69,200 $ 69,600