Merger with Tremont Mortgage Trust- Purchase Price Allocation (Details) - TRMT Merger $ in Thousands	Sep. 30, 2021 USD ($)
Asset Acquisition [Line Items]
Cash and cash equivalents	$ 11,070
Loans held for investment, net	169,150
Accrued interest receivable	603
Prepaid expenses and other assets	31
Total assets	180,854
Accounts payable and other liabilities	(901)
Citibank Master Repurchase Facility	(128,962)
Due to related persons	(657)
Net assets acquired	50,334
Assumed working capital	(10,146)
Assumed Citibank Master Repurchase Facility, principal balance	128,962
Consideration transferred and liabilities assumed	$ 169,150