Mortgage Notes Receivable - Allowance for loan loss (Details) - USD ($) $ in Thousands		2 Months Ended		10 Months Ended	12 Months Ended
		Dec. 31, 2019		Nov. 14, 2019	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance		$ 4,594		$ 1,704	$ 10,590	$ 4,096	[1]
Allowance for Credit Loss, Beginning Balance	[1]	4,096
Adoption of ASU 2016-13		4,096	[1]	4,594	10,394	10,590
Provision for loan losses (benefits)		0		3,342	5,275	6,722
Charge offs		0		(452)	(5,471)	(2,203)	[2]
Allowance for Credit Loss, Ending Balance		$ 4,096	[1]	$ 4,594	10,394	10,590
Cumulative Effect, Period of Adoption, Adjustment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	[3]				1,975
Adoption of ASU 2016-13	[3]					1,975
Allowance for Credit Loss, Ending Balance	[3]					1,975
Unfunded Loan Commitment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance	[4]				0
Adoption of ASU 2016-13	[4]				904	0
Provision for loan losses (benefits)	[4]				904
Charge offs	[4]				0
Allowance for Credit Loss, Ending Balance	[4]				904	0
Funded And Unfunded Loan Commitment [Member]
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Allowance for Credit Loss, Beginning Balance					10,590
Adoption of ASU 2016-13					11,298	10,590
Provision for loan losses (benefits)					6,179
Charge offs					(5,471)
Allowance for Credit Loss, Ending Balance					$ 11,298	$ 10,590

[1] The beginning balance on November 15, 2019 (Successor) represents the allowance of the acquirer, BRELF II

[2] Resulting from either loan repayments where the proceeds are less than the principal outstanding or transfers to investment in real property owned upon foreclosure where the fair values of the underlying collateral are less than the principal outstanding.

[3] Recorded as a direct charge to stockholders’ equity, effective January 1, 2020, as a cumulative-effect of change in accounting principle.

[4] CECL allowance related to unfunded commitments is presented as a liability under accounts payable and accrued liabilities in our consolidated balance sheet.