Loans Portfolio - Schedule of Interests in Loans Receivable Held For Investment (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2021 USD ($) Investment Loan		Dec. 31, 2020 USD ($) Investment Loan
Financing Receivable Recorded Investment Past Due [Line Items]
Loan Commitment(5)	[1]	$ 7,488,611		$ 7,349,651
Weighted Average Interest Rate(4)		5.40%	[2]	6.57%	[3]
Held-to-maturity Securities
Financing Receivable Recorded Investment Past Due [Line Items]
Allowance for loan losses		$ (14)
Interests in loans receivable held-for-investment, net		$ 161,850
Held-to-maturity Securities | Senior Loans
Financing Receivable Recorded Investment Past Due [Line Items]
Number of Investments | Investment	[4]	1		2
Number of Loans | Loan	[4]	1		2
Loan Commitment(5)	[1],[4]	$ 200,727		$ 515,190
Principal Outstanding	[4]	161,566		338,957
Carrying Value	[4]	$ 161,864		$ 338,270
Stated Rate(2)		L + 4.25%	[5]	L + 4.54%	[6]
Weighted Average Interest Rate(4)		5.50%	[7]	5.39%	[3]

[1] Loan commitment represents initial loan commitments, as adjusted by commitment reductions, less loan repayments and transfers which qualified for sale accounting under GAAP.

[2] Reflects the weighted average interest rate based on the applicable floating benchmark rate (if applicable), including LIBOR floors (if applicable). Weighted average is based on outstanding principal as of December 31, 2021.

[3] Reflects the weighted average interest rate based on the applicable floating benchmark rate (if applicable), including LIBOR floors (if applicable). Weighted average is based on outstanding principal as of December 31, 2020.

[4] Senior loans include senior mortgages and similar credit quality loans, including related contiguous subordinate loans and pari passu participations in senior mortgage loans.

[5] One-month LIBOR as of December 31, 2021 was 0.10%. Weighted average is based on outstanding principal as of December 31, 2021

[6] One-month LIBOR as of December 31, 2020 was 0.14%. Weighted average is based on outstanding principal as of December 31, 2020.

[7] Reflects the weighted average interest rate based on the applicable floating benchmark rate (if applicable), including LIBOR floors (if applicable). Weighted average is based on outstanding principal as of December 31, 2021