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Transfers of Financial Assets - Carrying Amounts of Assets Pledged as Collateral, Borrowings and Other Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 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 3,000,000 3,200,000
Assets pledged as collateral 8,052,960 8,297,830
Asset Pledged as Collateral | Public deposits    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Investment securities pledged as collateral 2,800,000 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 2,760,479 2,977,693
Federal Home Loan Bank Advances [Member]    
Carrying amounts of the assets pledged as collateral    
Borrowing capacity 1,700,000 2,500,000
Federal Home Loan Bank Advances [Member] | Asset Pledged as Collateral    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 3,493,694 3,451,070
Federal Reserve Bank Advances [Member]    
Carrying amounts of the assets pledged as collateral    
Borrowing capacity 1,200,000 1,200,000
Federal Reserve Bank Advances [Member] | Asset Pledged as Collateral    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral 1,646,765 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 131,344 133,173
Interest rate swaps | Asset Pledged as Collateral without Right [Member]    
Financial Instruments Owned and Pledged as Collateral [Line Items]    
Assets pledged as collateral $ 20,678 $ 31,091