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Schedule IV - Mortgage Loans on Real Estate (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) loan | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 USD ($)
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Carrying Value | $ 12,707,625 | $ 10,157,126 | $ 10,157,126 | $ 20,780,548
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 224,706
Reconciliation of Balance Sheet Reported Amounts of Mortgage Loans on Real Estate |  |  |  |
Beginning balance | 12,707,625 | 10,157,126 | 7,565,459 |
Additions during period: |  |  |  |
Purchases | 8,762,553 | 2,983,295 | 2,987,775 |
Accretion of purchase discount | 11,234 | 19,940 | 19,686 |
Change in realized and unrealized gains (losses) | 638,557 | 4,096 | 10,214 |
Deductions during period: |  |  |  |
Repayments of principal | (1,052,812) | (182,163) | (175,664) |
Collection of interest | (11,429) | (21,754) | (26,081) |
Transfer to REO | (6,105) | (7,998) | (7,228) |
Cost of mortgages sold | (213,871) | (109,000) | (176,470) |
Provision for loan loss | 2,780 | (1,235) | 1,739 |
Change in realized and unrealized gains (losses) | 0 | (85,115) | (270) |
Amortization of premium | (57,984) | (49,567) | (42,034) |
Balance at end of period | $ 20,780,548 | $ 12,707,625 | $ 10,157,126 |
Original loan amount $0 - $99,999 | Distressed residential mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 1,355 |  |  |
Carrying Value | $ 62,833 |  |  | 62,833
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 12,942
Deductions during period: |  |  |  |
Balance at end of period | $ 62,833 |  |  |
Original loan amount $0 - $99,999 | Distressed residential mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 1.99% |  |  |
Original loan amount $0 - $99,999 | Distressed residential mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 14.99% |  |  |
Original loan amount $0 - $99,999 | First mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 1,482 |  |  |
Carrying Value | $ 84,154 |  |  | 84,154
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 6,901
Deductions during period: |  |  |  |
Balance at end of period | $ 84,154 |  |  |
Original loan amount $0 - $99,999 | First mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 1.38% |  |  |
Original loan amount $0 - $99,999 | First mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 13.50% |  |  |
Original loan amount $0 - $99,999 | Second mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 701 |  |  |
Carrying Value | $ 32,827 |  |  | 32,827
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 595
Deductions during period: |  |  |  |
Balance at end of period | $ 32,827 |  |  |
Original loan amount $0 - $99,999 | Second mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 5.75% |  |  |
Original loan amount $0 - $99,999 | Second mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 9.00% |  |  |
Original loan amount $100,000 - $199,999 | Distressed residential mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 577 |  |  |
Carrying Value | $ 62,926 |  |  | 62,926
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 13,302
Deductions during period: |  |  |  |
Balance at end of period | $ 62,926 |  |  |
Original loan amount $100,000 - $199,999 | Distressed residential mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 2.00% |  |  |
Original loan amount $100,000 - $199,999 | Distressed residential mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 12.48% |  |  |
Original loan amount $100,000 - $199,999 | First mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 2,769 |  |  |
Carrying Value | $ 328,284 |  |  | 328,284
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 29,491
Deductions during period: |  |  |  |
Balance at end of period | $ 328,284 |  |  |
Original loan amount $100,000 - $199,999 | First mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 1.50% |  |  |
Original loan amount $100,000 - $199,999 | First mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 13.38% |  |  |
Original loan amount $100,000 - $199,999 | Second mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 74 |  |  |
Carrying Value | $ 9,549 |  |  | 9,549
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 0
Deductions during period: |  |  |  |
Balance at end of period | $ 9,549 |  |  |
Original loan amount $100,000 - $199,999 | Second mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 6.25% |  |  |
Original loan amount $100,000 - $199,999 | Second mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 9.13% |  |  |
Original loan amount $200,000 - $299,999 | Distressed residential mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 139 |  |  |
Carrying Value | $ 27,775 |  |  | 27,775
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 7,914
Deductions during period: |  |  |  |
Balance at end of period | $ 27,775 |  |  |
Original loan amount $200,000 - $299,999 | Distressed residential mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 0.00% |  |  |
Original loan amount $200,000 - $299,999 | Distressed residential mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 11.44% |  |  |
Original loan amount $200,000 - $299,999 | First mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 1,484 |  |  |
Carrying Value | $ 301,835 |  |  | 301,835
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 29,612
Deductions during period: |  |  |  |
Balance at end of period | $ 301,835 |  |  |
Original loan amount $200,000 - $299,999 | First mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 0.25% |  |  |
Original loan amount $200,000 - $299,999 | First mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 12.00% |  |  |
Original loan amount $200,000 - $299,999 | Second mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 18 |  |  |
Carrying Value | $ 4,137 |  |  | 4,137
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 0
Deductions during period: |  |  |  |
Balance at end of period | $ 4,137 |  |  |
Original loan amount $200,000 - $299,999 | Second mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 6.25% |  |  |
Original loan amount $200,000 - $299,999 | Second mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 8.63% |  |  |
Original loan amount over $299,999 | Distressed residential mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 112 |  |  |
Carrying Value | $ 49,222 |  |  | 49,222
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 16,477
Deductions during period: |  |  |  |
Balance at end of period | $ 49,222 |  |  |
Original loan amount over $299,999 | Distressed residential mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 2.00% |  |  |
Original loan amount over $299,999 | Distressed residential mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 9.75% |  |  |
Original loan amount over $299,999 | First mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 1,701 |  |  |
Carrying Value | $ 668,673 |  |  | 668,673
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 56,318
Deductions during period: |  |  |  |
Balance at end of period | $ 668,673 |  |  |
Original loan amount over $299,999 | First mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 2.00% |  |  |
Original loan amount over $299,999 | First mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 12.00% |  |  |
Original loan amount over $299,999 | Second mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 1 |  |  |
Carrying Value | $ 295 |  |  | 295
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 0
Deductions during period: |  |  |  |
Balance at end of period | $ 295 |  |  |
Original loan amount over $299,999 | Second mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 6.88% |  |  |
Original loan amount over $299,999 | Second mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 6.88% |  |  |
Residential loans and loans held for sale | Other mortgage loans |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 14 |  |  |
Carrying Value | $ 2,406 |  |  | 2,406
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | 413
Deductions during period: |  |  |  |
Balance at end of period | $ 2,406 |  |  |
Residential loans and loans held for sale | Other mortgage loans | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 2.36% |  |  |
Residential loans and loans held for sale | Other mortgage loans | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 5.63% |  |  |
First mortgage loans | Residential mortgage loans held in securitization trust, at fair value |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 8,103 |  |  |
Carrying Value | $ 1,328,886 |  |  | 1,328,886
Deductions during period: |  |  |  |
Balance at end of period | $ 1,328,886 |  |  |
First mortgage loans | Residential mortgage loans held in securitization trust, at fair value | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 1.38% |  |  |
First mortgage loans | Residential mortgage loans held in securitization trust, at fair value | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 10.50% |  |  |
First mortgage loans | Multifamily | Multi-family loans held in securitization trusts, at fair value |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Number of Loans | loan | 828 |  |  |
Carrying Value | $ 17,816,746 |  |  | 17,816,746
Principal Amount of Loans Subject to Delinquent Principal or Interest |  |  |  | $ 0
Deductions during period: |  |  |  |
Balance at end of period | $ 17,816,746 |  |  |
First mortgage loans | Multifamily | Multi-family loans held in securitization trusts, at fair value | Minimum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 3.04% |  |  |
First mortgage loans | Multifamily | Multi-family loans held in securitization trusts, at fair value | Maximum |  |  |  |
SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] |  |  |  |
Interest Rate | 5.76% |  |  |

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