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Loans and Investments - Loan Modifications (Details) $ in Thousands	1 Months Ended		3 Months Ended		12 Months Ended
	Sep. 30, 2023 USD ($)	Jun. 30, 2021 USD ($)	Dec. 31, 2023 USD ($) loan	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) loan	Dec. 31, 2022 USD ($) loan	Dec. 31, 2021 USD ($) loan	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Recoveries of reserves					$ 4,776	$ 1,500	$ 24,315
Loans and investments, gross			$ 12,615,006		12,615,006	14,456,123
Interest reserve					156,100	123,700
Principal paydowns					3,354,055	3,818,554	2,516,771
Purchase of loan					1,362,171	5,955,061	9,209,475
Loans and investments, net allowance for credit losses			195,664		$ 195,664	$ 132,559	$ 113,241	$ 148,329
Proceeds from full satisfaction of loans		$ 95,000
Reversal of allowance for credit losses		7,500
Interest income from loans		$ 3,500
Loan modification, refinancing, and extensions \| loan					0	0	0
Bridge Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Variable rate, spread (as a percent)				3.40%
Loans and investments, gross			12,273,244	$ 70,500	$ 12,273,244	$ 14,096,054
Financing receivable, fixed interest rate	0.0300
Financing receivable, accrual rate	0.0300
Financing receivable, total fixed rate	0.0600
Financing receivable, borrower required funding	$ 10,500
Interest reserve	2,500
Financing receivable, borrower requirement, capital improvements	$ 8,000
Mezzanine Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans and investments, gross			248,457		248,457	213,499
Multifamily
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Loans and investments, net allowance for credit losses			$ 110,847		110,847	37,961	$ 18,707	36,468
Multifamily \| Bridge Loans \| Interest Deferral, Extended Maturity, And Interest Forgiveness
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Number of financing receivables modified during period \| loan			3
Financing receivable, amount modified in period			$ 241,000
Financing receivable modified, weighted average term increase from modification			1 year
Percentage of deferred interest waived			0.25
Multifamily \| Bridge Loans \| Interest Deferral, Extended Maturity, And Interest Forgiveness \| Minimum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Percentage of interest foregone			0.0200
Multifamily \| Bridge Loans \| Interest Deferral, Extended Maturity, And Interest Forgiveness \| Minimum \| Secured Overnight Financing Rate (SOFR)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Variable rate, spread (as a percent)			4.00%
Multifamily \| Bridge Loans \| Interest Deferral, Extended Maturity, And Interest Forgiveness \| Maximum
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Percentage of interest foregone			0.0215
Multifamily \| Bridge Loans \| Interest Deferral, Extended Maturity, And Interest Forgiveness \| Maximum \| Secured Overnight Financing Rate (SOFR)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Variable rate, spread (as a percent)			4.30%
Multifamily \| Bridge Loans \| Rate of Interest and Extended Maturity
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Financing receivable, amount modified in period			$ 86,900
Financing receivable modified, weighted average term increase from modification			1 year
Financing receivable modified, pay rate of interest			$ 500
Multifamily \| Bridge Loans \| Rate of Interest and Extended Maturity \| Secured Overnight Financing Rate (SOFR)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Variable rate, spread (as a percent)			4.25%
Office
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Financing receivable, net of reserve			$ 37,100		37,100
Loan reserve			8,000		8,000
Recoveries of reserves			2,300
Loans and investments, net allowance for credit losses			142		142	8,162	8,073	1,846
Retail
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Recoveries of reserves					2,500
Loans and investments, net allowance for credit losses			$ 3,293		$ 3,293	$ 5,819	5,819	$ 13,861
Retail \| Loan Modification Agreement
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Percentage of interest foregone								2.00
Maturity period (in years)								3 years
Principal paydowns								$ 6,000
Principal reduction								8,000
Additional reserve deposit								$ 4,600
Retail \| LIBOR \| Loan Modification Agreement
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Variable rate, spread (as a percent)								5.50%
LIBOR floor rate								6.50%
Retail \| Bridge Loans \| Loan Modification Agreement
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal amount								$ 26,500
Retail \| Bridge Loans \| LIBOR \| Loan Modification Agreement
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Variable rate, spread (as a percent)								6.00%
LIBOR floor rate								2.375%
Retail \| Mezzanine Loans \| Loan Modification Agreement
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal amount								$ 6,100
Fixed rate of interest (as a percent)								12.00%
Hotel \| Forbearance Agreement
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Fixed rate of interest (as a percent)		9.50%
Principal reduction								$ 10,000
Pay rate (as a percent)								1.00%
Hotel \| LIBOR \| Forbearance Agreement
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Variable rate, spread (as a percent)								3.00%
LIBOR floor rate								1.50%
Hotel \| Bridge Loans
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items]
Principal amount									$ 110,000
Purchase of loan							60,000		$ 50,000
Loans and investments, net allowance for credit losses							7,500
Loan discount							$ 39,900
Total discount received								$ 20,100