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Loans and Investments - Purchased Credit Deterioration and Troubled Debt Restructurings (Details) $ in Thousands	1 Months Ended			6 Months Ended		12 Months Ended
	Jun. 30, 2021 USD ($) loan	Jan. 31, 2021	Aug. 31, 2020 USD ($)	Jun. 30, 2021 USD ($) item loan	Jun. 30, 2020 USD ($) item	Dec. 31, 2020 USD ($) loan	Dec. 31, 2019 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2019 USD ($)
Financing Receivable, Recorded Investment, Past Due [Line Items]
Purchase of loan				$ 2,814,170	$ 1,117,004
Allowance for credit losses	$ 138,447			$ 138,447	$ 152,811	$ 148,329		$ 147,300	$ 142,252	$ 152,811
Troubled debt restructurings, number | item				2
Other loans modification | item				0	0
Interest reserve				$ 84,400		$ 78,300
Number of loans covered under interest reserve | loan	262			262		186
Aggregate UPB covered under interest reserve	$ 4,690,000			$ 4,690,000		$ 3,600,000
Proceeds from full satisfaction of loans	95,000
Reversal of allowance for credit losses	7,500			7,500
Interest income from loans	3,500
Hotel
Financing Receivable, Recorded Investment, Past Due [Line Items]
Allowance for credit losses	225			225	$ 7,672	7,759		7,754	7,528
Hotel | Forbearance agreement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Pay rate (as a percent)			1.00%
Mortgage Loans on Real Estate Fixed Interest Rate		9.50%
Fixed rate of interest (as a percent)		9.50%
Principal reduction			$ (10,000)
Hotel | Forbearance agreement | LIBOR
Financing Receivable, Recorded Investment, Past Due [Line Items]
Variable rate, spread (as a percent)			3.00%
LIBOR Floor rate			1.50%
Retail
Financing Receivable, Recorded Investment, Past Due [Line Items]
Allowance for credit losses	13,819			13,819	$ 13,981	13,861		$ 13,848	11,322
Retail | Loan modification agreement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Maturity period (in years)			3 years
Percentage of interest foregone			2.00
Principal paydowns			$ 6,000
Principal reduction			(8,000)
Additional reserve deposit			4,600
Charge-offs			$ 8,000
Retail | Loan modification agreement | LIBOR
Financing Receivable, Recorded Investment, Past Due [Line Items]
Variable rate, spread (as a percent)			5.50%
LIBOR Floor rate			6.50%
Bridge loans
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal amount	35,000			35,000
Bridge loans | Hotel
Financing Receivable, Recorded Investment, Past Due [Line Items]
Purchase of loan			$ 60,000				$ 50,000
Principal amount							$ 110,000
Allowance for credit losses									$ 7,500
Loan discount			39,900
Total discount received			20,100
Bridge loans | Retail | Loan modification agreement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal amount			$ 26,500
Bridge loans | Retail | Loan modification agreement | LIBOR
Financing Receivable, Recorded Investment, Past Due [Line Items]
Variable rate, spread (as a percent)			6.00%
LIBOR Floor rate			2.375%
Mezzanine loans | Retail | Loan modification agreement
Financing Receivable, Recorded Investment, Past Due [Line Items]
Principal amount			$ 6,100
Mortgage Loans on Real Estate Fixed Interest Rate			12.00%
Fixed rate of interest (as a percent)			12.00%
Greater than 90 Days Past Due
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans past due 90 days or more still accruing interest	$ 0			$ 0		$ 0

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