Loans Held for Investment and the Allowance for Credit Losses - Schedule of Paid-in-Kind Interest (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021
Paid In Kind Interest [Abstract]
Balance	$ 5,517	$ 4,701	$ 4,701
PIK accrued	360	816	1,200
PIK repayments	(1,034)
Balance	4,153	$ 5,517	$ 4,153
PIK write-off	$ (690)