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Related Party Transactions and Arrangements - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 26, 2020
Apr. 18, 2018
Feb. 22, 2018
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Related Party Transaction [Line Items]            
Aggregate purchase price of commercial mortgage loans       $ 287,644,000 $ 310,904,000  
Commercial mortgage loans, held-for-sale, measured at fair value       91,813,000   $ 112,562,000
Interest expense       3,642,000   $ 16,616,000
Affiliated Entity | CMBS            
Related Party Transaction [Line Items]            
Aggregate purchase price of commercial mortgage loans     $ 27,800,000      
Proceeds from CBMS sold into securitization   $ 23,300,000        
Commercial mortgage loans, held-for-sale, measured at fair value       $ 4,500,000    
Affiliated Entity | Benefit Street Partners LLC            
Related Party Transaction [Line Items]            
Monthly asset management fee, percent of equity       0.125%    
Annual asset management fee, percent of stockholder's equity       1.50%    
Subordinated performance fee, percent that total return exceeds per year       6.00%    
Percent of excess total return       15.00%    
Maximum annual subordinated performance fee payable percent of total return       10.00%    
Affiliated Entity | Benefit Street Partners LLC | Fee to Acquire and Originate Real Estate Debt            
Related Party Transaction [Line Items]            
Transaction rate       0.50%    
SBL | Affiliated Entity            
Related Party Transaction [Line Items]            
Shares owned (in shares) 14,949.53          
SBL | Unsecured Debt            
Related Party Transaction [Line Items]            
Total commitment $ 100,000,000          
Interest expense       $ 17,000    
Outstanding balance       $ 0    
LIBOR | SBL | Unsecured Debt            
Related Party Transaction [Line Items]            
Interest Rate 4.50%