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Transfers of Financial Assets - Carrying Amounts of Assets Pledged as Collateral, Borrowings and Other Transactions (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Financial Instruments Owned and Pledged as Collateral [Line Items]    
In-substance debt defeasance $ 0 $ 0
Carrying amounts of the assets pledged as collateral    
Securities for reverse repurchase agreements 0 0
Asset Pledged as Collateral    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Investment securities pledged as collateral 5,000,000 3,200,000
Assets pledged as collateral 11,278,394 8,297,830
Public deposits | Asset Pledged as Collateral with Right    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 2,571,359 2,977,693
Federal Home Loan Bank Advances | Asset Pledged as Collateral    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 4,495,266 3,451,070
Federal Reserve Bank Advances | Asset Pledged as Collateral    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 4,074,093 1,704,803
ACH transactions | Asset Pledged as Collateral without Right    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 137,101 133,173
Interest rate swaps | Asset Pledged as Collateral without Right    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral $ 575 $ 31,091