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Repurchase Agreements - Outstanding Repurchase Agreement Borrowings by Contractual Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding repurchase agreements $ 87,571 $ 2,352,102
Within 30 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding repurchase agreements 0 449,474
Over 30 days to 90 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding repurchase agreements 87,571 1,647,683
Over 90 days    
Assets Sold under Agreements to Repurchase [Line Items]    
Outstanding repurchase agreements $ 0 $ 254,945