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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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