Summary of Significant Accounting Policies - Loan Held-for-Investments (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Loans and Leases Receivable Disclosure [Line Items]
Interest income	$ 70,561,000	$ 29,393,000	$ 20,132,000
Capitalized to held for investment	0	$ 539,000
Mezzanine loans
Loans and Leases Receivable Disclosure [Line Items]
Non accrual loans	$ 0