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Transfers of Financial Assets - Carrying Amounts of Assets Pledged as Collateral, Borrowings and Other Transactions (Details) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 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 6,300,000 3,200,000
Assets pledged as collateral 13,267,247 8,297,830
Asset Pledged as Collateral | Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Investment securities pledged as collateral 3,500,000 3,000,000
Public deposits | Asset Pledged as Collateral with Right [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Investment securities pledged as collateral 3,511,412 2,977,693
Federal Home Loan Bank Advances [Member] | Asset Pledged as Collateral    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 4,817,865 3,451,070
Federal Reserve Bank Advances [Member] | Asset Pledged as Collateral    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 4,801,873 1,704,803
ACH transactions | Asset Pledged as Collateral without Right [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 135,512 133,173
Interest rate swaps | Asset Pledged as Collateral without Right [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral $ 585 $ 31,091