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Short-Term Borrowings (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Secured Debt, Repurchase Agreements    
Carrying amount of securities sold under repurchase agreements with customers $ 247,900 $ 241,000
Carrying amount of the securities pledged to collateralize repurchase agreements 7,077,128 7,463,871
Federal funds purchased 290,429 248,162
Letter of credit outstanding 2,900  
Loans 33,080,211 31,931,916
FRB Borrowings    
Secured Debt, Repurchase Agreements    
Debt Instrument Collateral Amount 1,700,000  
Letter of credit outstanding 0 0
Maximum borrowing capacity 1,700,000  
Loans 2,600,000  
FHLB Advances    
Secured Debt, Repurchase Agreements    
Outstanding advances 300,000 100,000
Debt Instrument Collateral Amount 6,300,000  
Amount of cash pledged as collateral 176,000  
Unused net credit available with the FHLB 6,200,000  
Debt Instrument Unused Borrowing Capacity Amount $ 6,500,000  
Asset Pledged as Collateral | FRB Borrowings    
Secured Debt, Repurchase Agreements    
Financing Receivable, Pledging Purpose [Extensible Enumeration] Federal funds purchased  
Asset Pledged as Collateral | FHLB Advances    
Secured Debt, Repurchase Agreements    
Debt Instrument Collateral Amount $ 11,700,000  
Amount of cash pledged as collateral 207,500  
Asset Pledged as Collateral | Securities sold under agreements to repurchase    
Secured Debt, Repurchase Agreements    
Carrying amount of the securities pledged to collateralize repurchase agreements $ 392,700 $ 410,400