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Debt - Schedule of Securitization Notes Outstanding (Details) - USD ($) | Jun. 30, 2020 | Dec. 31, 2019
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Debt Instrument [Line Items] |  |
Percentage of ownership interests in joint venture | 34.00% |
Mortgage loans |  |
Debt Instrument [Line Items] |  |
Deferred issuance costs | $ (5,400,000) | $ (7,000,000.0)
Mortgage loans | Ajax Mortgage Loan Trust 2017-D/ December 2017 |  |
Debt Instrument [Line Items] |  |
Percentage of ownership interests in joint venture | 50.00% |
Reflection of required consolidation | 100.00% |
Mortgage loans | Class A Notes | 2018-C |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 138,600,000 | 148,500,000
Securities Borrowed, Liability | 131,600,000 | 141,000,000.0
Mortgage loans | Class A Notes | Ajax Mortgage Loan Trust 2017-B/ December 2017 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 115,800,000 |
Interest Rate | 3.16% |
Mortgage loans | Class A Notes | Ajax Mortgage Loan Trust 2017-C/ November 2017 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 130,200,000 |
Interest Rate | 3.75% |
Mortgage loans | Class A Notes | Ajax Mortgage Loan Trust 2017-D/ December 2017 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 177,800,000 |
Interest Rate | 3.75% |
Ownership percentage | 50.00% |
Mortgage loans | Class A Notes | Ajax Mortgage Loan Trust 2018-C/ September 2018 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 170,500,000 |
Interest Rate | 4.36% |
Mortgage loans | Class B Notes | 2018-C |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 15,900,000 | 15,900,000
Securities Borrowed, Liability | 5,900,000 | $ 5,900,000
Mortgage loans | Class B Notes | Ajax Mortgage Loan Trust 2018-C/ September 2018 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 15,900,000 |
Interest Rate | 5.25% |
Mortgage loans | Class B 1 Notes | Ajax Mortgage Loan Trust 2017-B/ December 2017 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 9,000,000.0 |
Interest Rate | 3.75% |
Mortgage loans | Class B 1 Notes | Ajax Mortgage Loan Trust 2017-C/ November 2017 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 13,000,000.0 |
Interest Rate | 5.25% |
Mortgage loans | Class B 1 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 7,500,000 |
Interest Rate | 3.50% |
Mortgage loans | Class B 1 Notes | Ajax Mortgage Loan Trust 2019 F November 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 11,500,000 |
Interest Rate | 3.50% |
Mortgage loans | Class B 2 Notes | Ajax Mortgage Loan Trust 2017-B/ December 2017 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 7,500,000 |
Interest Rate | 3.75% |
Mortgage loans | Class B 2 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 7,100,000 |
Mortgage loans | Class B 2 Notes | Ajax Mortgage Loan Trust 2019 F November 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | 10,400,000 |
Mortgage loans | Trust Certificate | Ajax Mortgage Loan Trust 2017-B/ December 2017 |  |
Debt Instrument [Line Items] |  |
Original principal, trust certificates | $ 14,300,000 |
Interest Rate | 0.00% |
Mortgage loans | Trust Certificate | Ajax Mortgage Loan Trust 2017-C/ November 2017 |  |
Debt Instrument [Line Items] |  |
Original principal, trust certificates | $ 42,800,000 |
Interest Rate | 0.00% |
Mortgage loans | Trust Certificate | Ajax Mortgage Loan Trust 2018-C/ September 2018 |  |
Debt Instrument [Line Items] |  |
Original principal, trust certificates | $ 40,900,000 |
Interest Rate | 0.00% |
Mortgage loans | Deferred issuance costs | Ajax Mortgage Loan Trust 2017-B/ December 2017 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.00% |
Deferred issuance costs | $ (1,800,000) |
Mortgage loans | Deferred issuance costs | Ajax Mortgage Loan Trust 2017-C/ November 2017 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.00% |
Deferred issuance costs | $ (1,700,000) |
Mortgage loans | Deferred issuance costs | Ajax Mortgage Loan Trust 2017-D/ December 2017 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.00% |
Deferred issuance costs | $ (1,100,000) |
Mortgage loans | Deferred issuance costs | Ajax Mortgage Loan Trust 2018-C/ September 2018 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.00% |
Deferred issuance costs | $ (2,000,000.0) |
Mortgage loans | Deferred issuance costs | Ajax Mortgage Loan Trust 2019-D/ July 2019 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.00% |
Deferred issuance costs | $ (2,700,000) |
Mortgage loans | Deferred issuance costs | Ajax Mortgage Loan Trust 2019 F November 2019 |  |
Debt Instrument [Line Items] |  |
Interest Rate | 0.00% |
Deferred issuance costs | $ (1,800,000) |
Mortgage loans | Class M1 Notes | Ajax Mortgage Loan Trust 2017-B/ December 2017 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 9,700,000 |
Interest Rate | 3.50% |
Mortgage loans | Class M1 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 9,300,000 |
Interest Rate | 3.50% |
Mortgage loans | Class M1 Notes | Ajax Mortgage Loan Trust 2019 F November 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 6,100,000 |
Interest Rate | 3.50% |
Mortgage loans | Class M2 Notes | Ajax Mortgage Loan Trust 2017-B/ December 2017 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 9,500,000 |
Interest Rate | 3.50% |
Mortgage loans | Class B Certificates | Ajax Mortgage Loan Trust 2017-D/ December 2017 |  |
Debt Instrument [Line Items] |  |
Original principal, trust certificates | $ 44,500,000 |
Interest Rate | 0.00% |
Ownership percentage | 50.00% |
Mortgage loans | Class A-1 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 140,400,000 |
Interest Rate | 2.96% |
Mortgage loans | Class A-1 Notes | Ajax Mortgage Loan Trust 2019 F November 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 110,100,000 |
Interest Rate | 2.86% |
Mortgage loans | Class A-2 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 6,100,000 |
Interest Rate | 3.50% |
Mortgage loans | Class A-2 Notes | Ajax Mortgage Loan Trust 2019 F November 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 12,500,000 |
Interest Rate | 3.50% |
Mortgage loans | Class A-3 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 10,100,000 |
Interest Rate | 3.50% |
Mortgage loans | Class A-3 Notes | Ajax Mortgage Loan Trust 2019 F November 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 5,100,000 |
Interest Rate | 3.50% |
Mortgage loans | Class B-3 Notes | Ajax Mortgage Loan Trust 2019-D/ July 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 12,800,000 |
Mortgage loans | Class B-3 Notes | Ajax Mortgage Loan Trust 2019 F November 2019 |  |
Debt Instrument [Line Items] |  |
Original Principal | $ 15,100,000 |

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