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Repurchase Agreements - Maturities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, maturities $ 1,490,996 $ 50,077
Within 30 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, maturities 229,384 50,077
Over 30 day to 90 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, maturities 1,261,612 0
Over 90 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Repurchase agreements, maturities $ 0 $ 0