Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Income Tax [Line Items]
Excise tax percentage	100.00%
Reserve for uncertain income tax positions	$ 0		$ 0
Interest for underpayment of income taxes	0
Penalties for underpayment of income taxes			0
Current portion of income tax expense (benefit)	$ 100,000	$ 900,000
Effective income tax rate	0.40%	2.80%
CRE Debt Securities
Income Tax [Line Items]
Aggregate losses from the sales	$ 203,400,000
Capital gains			15,800,000	$ 0
Remaining capital loss carryforwards	$ 187,600,000		187,600,000
CRE Debt Securities | Minimum
Income Tax [Line Items]
Percentage of REIT taxable income distributed to stockholders	90.00%
TRSs
Income Tax [Line Items]
Deferred tax assets	$ 0		0
Deferred tax liabilities	$ 100,000		$ 300,000
REIT Subsidiaries
Income Tax [Line Items]
Equity interest percentage by parent	100.00%
Sub-REIT
Income Tax [Line Items]
Equity interest percentage by parent	100.00%
U.S. federal corporate tax rate	21.00%