Loans Receivable - Schedule of Loans Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Financing Receivable, Allowance for Credit Loss [Line Items]
Unamortized discounts, fees, and costs	$ (3,301)	$ (4,186)
Reserve for loan losses	(1,944)	(1,813)	$ (10,280)
Loans receivable, net	409,753	415,811
Remaining loans receivable commitments	49,000	58,000
Secured mortgage loans
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	388,746	396,281
Mezzanine and other
Financing Receivable, Allowance for Credit Loss [Line Items]
Financing receivable, gross	$ 26,252	$ 25,529