Related Party Transactions - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Related Party Transaction [Line Items]
Annual base management fee percentage			1.50%
Base management fee payable to affiliate	$ 9,011,000		$ 9,011,000		$ 9,315,000
Management fees - affiliate	9,011,000	$ 9,641,000	$ 18,221,000	$ 19,297,000
Management fee, description			Effective October 1, 2015, our Manager earns a base management fee in an amount equal to 1.50% per annum of Stockholders’ Equity, as defined in the Management Agreement. Management fees are reduced by our pro rata share of any management fees and incentive fees (if incentive fees are not incurred by us) incurred to our Manager by CMTG/TT. Management fees are paid quarterly, in arrears, and $9.0 million and $9.3 million were accrued and were included in management fee payable – affiliate, on our consolidated balance sheets at June 30, 2024 and December 31, 2023, respectively.
Incentive fee rate			20.00%
Minimum percentage of incentive fee to be paid in return on stockholders’ equity			7.00%
Incentive fees, description			Manager is entitled to an incentive fee equal to 20% of the excess of our Core Earnings on a rolling four-quarter basis, as defined in the Management Agreement, over a 7.00% return on Stockholders’ Equity. Incentive fees are reduced by our pro rata share of any incentive fees incurred to our Manager by CMTG/TT.
Incentive fee payable - affiliate	0		$ 0		0
Termination fee, description			If we elect to terminate the Management Agreement, we are required to pay our Manager a termination fee equal to three times the sum of the average total annual amount of management fees and the average annual incentive fee paid by us over the prior two years.
Other liabilities	43,182,000		$ 43,182,000		47,368,000
Reimbursements
Related Party Transaction [Line Items]
General and administrative expense	1,400,000	$ 1,300,000	2,200,000	$ 2,000,000
Other liabilities	$ 1,000,000		$ 1,000,000		$ 1,000,000