Fair Value of Financial Instruments - Recurring Fair Value (Details) - Level III - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	$ 278,225	$ 242,078
Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans held for investment	273,860	242,763
Master Repurchase Facility | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Master Repurchase Facility	200,465	164,694
Master Repurchase Facility | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Master Repurchase Facility	$ 197,102	$ 165,536