Annual report pursuant to Section 13 and 15(d)

Borrowings - MetLife Facility (Narrative) (Details)

v3.20.4
Borrowings - MetLife Facility (Narrative) (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Feb. 20, 2020
Dec. 31, 2019
Debt Instrument [Line Items]      
Debt instrument, loans to value ratios percentage 60.00%    
MetLife Credit Facility      
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 200,000,000.0
Line of credit facility, maximum borrowing capacity     75,000,000.0
Debt instrument, loans to value ratios percentage 60.00%    
MetLife Credit Facility | Notes payable to bank      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 75,000,000 $ 75,000,000.0  
Undrawn commitment $ 38,100,000   $ 21,500,000