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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, 2022
Dec. 31, 2021
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 3,200,000 2,100,000
Assets pledged as collateral 8,297,830 6,181,158
Asset Pledged as Collateral | Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Investment securities pledged as collateral 3,000,000 1,900,000
Asset Pledged as Collateral | Federal Home Loan Bank    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 3,451,070 2,380,042
Asset Pledged as Collateral | Federal Reserve Bank    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 1,704,803 1,724,279
Asset Pledged as Collateral with Right [Member] | Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Investment securities pledged as collateral 2,977,693 1,913,369
Asset Pledged as Collateral without Right [Member] | ACH transactions    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 133,173 115,038
Asset Pledged as Collateral without Right [Member] | Interest rate swaps    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral $ 31,091 $ 48,430