Commitments and Contingencies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Return of capital distribution from CMTG/CN Mortgage REIT LLC			$ 128
Loan Commitments Refunded	$ 1,100,000	$ 1,400,000
Existing Secured Financing Commitments	584,300	$ 650,900
Notes Payable Repaid Date		May 27, 2021
Estimated Equity Required		$ 2,600
Commitment Related To Arrangements	0	55,000
Commitments Amount Drawn	$ 0	$ 0
Maximum
Loss Contingencies [Line Items]
Lease Expiration Period	5 years	5 years
Claros Mortgage Trust
Loss Contingencies [Line Items]
Commitment Interest	51.00%
Commitment Amount	$ 124,900
Loans Recall Price	$ 10.00
Loan Repayment Period	6 months
Company Contribution Amount	$ 162,100	$ 159,500
Remaining Capital Commitment	73,800	76,400
Return of capital distribution from CMTG/CN Mortgage REIT LLC	123,200	$ 111,100
Claros Mortgage Trust Participation
Loss Contingencies [Line Items]
Capital Commitment Expenses	1,100
Claros Mortgage Trust Participation | Maximum
Loss Contingencies [Line Items]
Required Equity Amount	$ 100,000