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Investment Securities Available for Sale - Narrative (Details)
Apr. 01, 2024
USD ($)
Mar. 31, 2024
USD ($)
security
Dec. 31, 2023
USD ($)
Financing Receivable, Impaired [Line Items]      
Gross unrealized loss   $ 1,465,692,000 $ 1,334,132,000
Investment securities in a loss position for less than twelve months | security   29  
Investment securities in a loss position for twelve months or longer | security   353  
Allowance for credit loss   $ 0  
Subsequent Event      
Financing Receivable, Impaired [Line Items]      
Debt securities transferred from available for sale to held to maturity $ 3,420,000,000    
Gross unrealized loss $ 708,500,000    
Collateral Pledged      
Financing Receivable, Impaired [Line Items]      
Pledged to secure deposits   $ 5,020,000,000.00 $ 5,190,000,000