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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 ($) | Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Loans and Investments |  |  |  |  |
Principal paydowns |  | $ 3,818,554 | $ 2,516,771 | $ 1,243,694 |
Purchase of loan |  | 5,955,061 | 9,209,475 | 2,376,233 |
Allowance for credit losses |  | $ 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 |  |  |  |
Troubled debt restructurings, number | loan |  | 2 |  |  |
Other loans modification | loan |  | 0 | 0 |  |
Interest reserve |  | $ 123,700 | $ 87,400 |  |
Number of loans covered under interest reserve | loan |  | 480 | 328 |  |
Aggregate UPB covered under interest reserve |  | $ 5,750,000 | $ 7,700,000 |  |
Impairment loss on sale of loans |  | $ 55,816 | 123,037 | 94,607 |
$750M ASAP agreement | Agency Business Segment [Member] |  |  |  |  |
Loans and Investments |  |  |  |  |
LIBOR floor rate |  | 0.25% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Structured Business |  |  |  |  |
Loans and Investments |  |  |  |  |
LIBOR floor rate |  | 2.60% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | Joint Repurchase Facility 1.00 Billion [Member] | Structured Business |  |  |  |  |
Loans and Investments |  |  |  |  |
LIBOR floor rate |  | 0.35% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | $225M credit facility | Structured Business |  |  |  |  |
Loans and Investments |  |  |  |  |
Variable rate, spread (as a percent) |  | 2.55% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | $35M working capital facility | Structured Business |  |  |  |  |
Loans and Investments |  |  |  |  |
Variable rate, spread (as a percent) |  | 3.00% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | $25M credit facility | Structured Business |  |  |  |  |
Loans and Investments |  |  |  |  |
Variable rate, spread (as a percent) |  | 2.60% |  |  |
LIBOR floor rate |  | 4.25% |  |  |
London Interbank Offered Rate (LIBOR) [Member] | $200M credit facility | Structured Business |  |  |  |  |
Loans and Investments |  |  |  |  |
Variable rate, spread (as a percent) |  | 1.46% |  |  |
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | $400M repurchase facility | Structured Business |  |  |  |  |
Loans and Investments |  |  |  |  |
LIBOR floor rate |  | 0.25% |  |  |
Maximum [Member] | $225M credit facility | Structured Business | Single Family Rental Bonds [Member] |  |  |  |  |
Loans and Investments |  |  |  |  |
LIBOR floor rate |  | 4.10% |  |  |
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member] | Joint Repurchase Facility 1.00 Billion [Member] | Structured Business |  |  |  |  |
Loans and Investments |  |  |  |  |
Variable rate, spread (as a percent) |  | 2.25% |  |  |
LIBOR floor rate |  | 0.15% |  |  |
Maximum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | $400M repurchase facility | Structured Business |  |  |  |  |
Loans and Investments |  |  |  |  |
Variable rate, spread (as a percent) |  | 2.56% |  |  |
Minimum [Member] | $225M credit facility | Structured Business | Single Family Rental Bonds [Member] |  |  |  |  |
Loans and Investments |  |  |  |  |
LIBOR floor rate |  | 3.00% |  |  |
Minimum [Member] | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] | $400M repurchase facility | Structured Business |  |  |  |  |
Loans and Investments |  |  |  |  |
Variable rate, spread (as a percent) |  | 1.86% |  |  |
Hotel [Member] |  |  |  |  |
Loans and Investments |  |  |  |  |
Allowance for credit losses |  | $ 14 | 8 | 7,759 |
Hotel [Member] | Forbearance agreement |  |  |  |  |
Loans and Investments |  |  |  |  |
Fixed rate of interest (as a percent) | 9.50% |  |  |  |
Principal reduction |  |  |  |  | $ (10,000)
Pay rate (as a percent) |  |  |  |  | 1.00%
Hotel [Member] | Forbearance agreement | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Loans and Investments |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  |  | 3.00%
LIBOR floor rate |  |  |  |  | 1.50%
Retail Site [Member] |  |  |  |  |
Loans and Investments |  |  |  |  |
Allowance for credit losses |  | 5,819 | $ 5,819 | $ 13,861 |
Retail Site [Member] | Loan modification agreement |  |  |  |  |
Loans and Investments |  |  |  |  |
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 Site [Member] | Loan modification agreement | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Loans and Investments |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 5.50% |
LIBOR floor rate |  |  |  | 6.50% |
Bridge Loan [Member] |  |  |  |  |
Loans and Investments |  |  |  |  |
Principal amount |  | $ 35,000 |  |  |
Number of loans sold | loan |  | 4 |  |  |
Unpaid principal balance on loans |  | $ 296,900 |  |  |
Impairment loss on sale of loans |  | 2,000 |  |  |
Financing receivable |  | 78,000 |  |  |
Bridge Loan [Member] | Hotel [Member] |  |  |  |  |
Loans and Investments |  |  |  |  |
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 Loan [Member] | Retail Site [Member] | Loan modification agreement |  |  |  |  |
Loans and Investments |  |  |  |  |
Principal amount |  |  |  | $ 26,500 |
Bridge Loan [Member] | Retail Site [Member] | Loan modification agreement | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |
Loans and Investments |  |  |  |  |
Variable rate, spread (as a percent) |  |  |  | 6.00% |
LIBOR floor rate |  |  |  | 2.375% |
Mezzanine Loan [Member] | Retail Site [Member] | Loan modification agreement |  |  |  |  |
Loans and Investments |  |  |  |  |
Principal amount |  |  |  | $ 6,100 |
Fixed rate of interest (as a percent) |  |  |  | 12.00% |
Bridge loan and mezzanine loan |  |  |  |  |
Loans and Investments |  |  |  |  |
Loan discount |  | 102,200 |  |  |
Total mortgage loans and mezzanine loan sold |  | 110,500 |  |  |
Capital investment used to be future |  | 66,300 |  |  |
Fees and expenses |  | 9,200 |  |  |
Additional potential loan recover |  | $ 2,800 |  |  |

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