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Summary of Significant Accounting Policies - Allowance for Credit Losses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Investment Securities - Held to Maturity $ 2,254,670 $ 2,487,440
Net book balance 1,000  
Accrued interest receivable (AIR) $ 133,000 $ 127,000
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] Other Assets. Other Assets.
Minimum    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reasonable and supportable forecast period 1 year  
Maximum    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Reasonable and supportable forecast period 2 years  
Other Assets    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Accrued interest receivable for investment securities $ 24,200 $ 26,500
Other Liabilities    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Liability recorded for expected credit losses on unfunded commitments $ 45,300 $ 56,300