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Repurchase Agreements - Additional Information (Details)
1 Months Ended 3 Months Ended
Feb. 28, 2019
Aug. 31, 2018
USD ($)
Mar. 31, 2019
Agreement
Jan. 31, 2019
USD ($)
Jul. 31, 2018
USD ($)
Commercial Mortgage Loans | Repo Facility          
Repurchase Agreement [Line Items]          
Repurchase agreement in advances loan   $ 175,000,000   $ 250,000,000 $ 100,000,000
Repurchase agreement, maximum possible adjustment in loans         $ 250,000,000
Extended maturity date 2020-02        
Commercial Mortgage Loans | Repo Facility | LIBOR          
Repurchase Agreement [Line Items]          
Interest rate   2.25%      
Real Estate Securities          
Repurchase Agreement [Line Items]          
Number of master repurchase agreements | Agreement     2