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Loans and Investments - Purchased Credit Deterioration and Troubled Debt Restructurings (Details) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 USD ($) | Aug. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) | Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Principal paydowns |  |  | $ 2,516,771 | $ 1,243,694 | $ 1,753,693 |
Purchase of loan |  |  | 9,209,475 | 2,376,233 | 2,712,354 |
Allowance for credit losses |  |  | $ 113,241 | $ 148,329 | 71,069 |
Proceeds from full satisfaction of loans | $ 95,000 |  |  |  |  |
Reversal of allowance for credit losses | 7,500 |  |  |  |  |
Interest income from loans | $ 3,500 |  |  |  |  |
Troubled debt restructurings, number | loan |  |  | 2 | 0 |  |
Interest reserve |  |  | $ 87,400 | $ 78,300 |  |
Number of loans covered under interest reserve | loan |  |  | 328 | 186 |  |
Aggregate UPB covered under interest reserve |  |  | $ 5,750,000 | $ 3,600,000 |  |
Hotel Portfolio |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Allowance for credit losses |  |  | 8 | 7,759 |  |
Hotel Portfolio | Forbearance agreement |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Fixed rate of interest (as a percent) | 9.50% |  |  |  |  |
Principal reduction |  |  |  |  | $ (10,000) |
Pay rate (as a percent) |  |  |  |  | 1.00% |
Hotel Portfolio | 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 |  |  | 5,819 | $ 13,861 |  |
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 |  |  |
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 |  |  |
Fixed rate of interest (as a percent) |  |  |  |  |  | 10.00%
Bridge Loans | Hotel Portfolio |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Principal amount |  |  |  |  | $ 110,000 |
Purchase of loan |  |  |  | $ 60,000 | 50,000 |
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 |  |
Fixed rate of interest (as a percent) |  |  |  | 12.00% |  |

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