Fair Value - Narrative (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2022 USD ($) measurement_input	Mar. 31, 2021 USD ($)	Dec. 31, 2021 measurement_input
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized (gain) loss on mortgage loans and obligations held in securitization trusts, net | $	$ 0	$ 8,638
Level 3 | Recurring | Investments in unconsolidated ventures - PE Investments | Discount Rate | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
PE investment, measurement input	0.110		0.110
Level 3 | Recurring | Investments in unconsolidated ventures - PE Investments | Discount Rate | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
PE investment, measurement input	0.120		0.120
Level 3 | Recurring | Mortgage obligations issued by securitization trusts | Measurement Input, Yield | Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Discount rate	0.200		0.175
Level 3 | Recurring | Mortgage obligations issued by securitization trusts | Measurement Input, Expected Term | Weighted average
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Weighted average expected maturity of CRE securities	5 years 2 months 12 days		5 years 4 months 24 days