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Mortgage Loans - Narrative (Details) |  | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 01, 2020 USD ($) | Jun. 30, 2021 USD ($) loanPool loan | Jun. 30, 2020 USD ($) loan | Jun. 30, 2021 USD ($) loanPool loan | Jun. 30, 2020 USD ($) loan | Mar. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) loanPool | Mar. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Mortgage Loans on Real Estate |  |  |  |  |  |  |  |  |  |
Mortgage loans, net | [1],[2] |  | $ 955,628,000 |  | $ 955,628,000 |  |  | $ 1,119,372,000 |  |
Allowance for credit loss |  |  | (9,833,000) | $ (14,450,000) | (9,833,000) | $ (14,450,000) | $ (17,890,000) | $ (13,712,000) | $ (16,136,000) | $ (1,960,000)
Reversal of/(increase in) provision for credit losses due to increases/(decreases) in the net present value of expected cash flows |  |  | 2,740,000 | 1,799,000 | 8,240,000 | (94,000) |  |  |  |
Reversal of/(increase in) provision for credit losses due to increases/(decreases) in the net present value of expected cash flows |  |  |  | 1,800,000 | (8,240,000) | 94,000 |  |  |  |
Interest income |  |  | $ 18,400,000 | $ 20,200,000 | $ 41,600,000 | 39,800,000 |  |  |  |
Aggregate unpaid principal balance of mortgage loans on real estate |  |  |  |  |  | $ 26,200,000 |  |  |  |
Number of sold loans | loan |  |  | 760 | 0 |  | 26 |  |  |  |
Collateral value |  |  |  |  |  | $ 44,200,000 |  |  |  |
Beginning period adjustment for CECL adoption |  | $ 10,200,000 |  |  |  |  |  |  |  |
Number of loan pools | loanPool |  |  | 4 |  | 4 |  |  | 6 |  |
Number of remaining loans | loan |  |  | 22 |  |  |  |  |  |  |
Reclassification from non-credit discount to the allowance for changes in payment expectations |  |  | $ 5,450,000 | $ 0 | $ (3,782,000) | 0 |  |  |  |
Reclassification from non-credit discount to allowance |  |  | 0.0 |  | 0.0 |  |  |  |  |
Provisions for losses |  |  | 0 | 200,000 | 0 | 1,700,000 |  |  |  |
Warrants original basis |  |  | 9,500,000 | 9,500,000 | 9,500,000 | 9,500,000 |  |  |  |
Mortgage loans |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |  |  |  |  |
Mortgage loans, net |  |  |  | $ 26,100,000 |  | $ 26,100,000 |  |  |  |
RPLs, NPLs, and originated SBCs |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |  |  |  |  |
Mortgage loans, net |  |  | $ 955,600,000 |  | 955,600,000 |  |  | $ 1,100,000,000 |  |
SBC loans acquired at or near origination |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |  |  |  |  |
Aggregate unpaid principal balance of mortgage loans on real estate |  |  |  |  | $ 3,600,000 |  |  |  |  |
Number of originated SBC loans acquired | loan |  |  | 0 | 0 | 1 | 0 |  |  |  |
Non-PCD |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |  |  |  |  |
Mortgage loans, net |  |  | $ 28,436,000 |  | $ 28,436,000 |  |  | $ 29,421,000 |  |
Number of loan pools | loanPool |  |  | 1 |  | 1 |  |  | 1 |  |
2017-D |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |  |  |  |  |
Mortgage loans, net |  |  | $ 129,200,000 |  | $ 129,200,000 |  |  | $ 133,896,000 |  |
Aggregate unpaid principal balance of mortgage loans on real estate |  |  | $ 133,800,000 |  | $ 133,800,000 |  |  |  |  |
Number of sold loans | loan |  |  | 760 |  | 760 |  |  |  |  |
Residential RPLs |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |  |  |  |  |
Mortgage loans, net |  |  | $ 897,516,000 |  | $ 897,516,000 |  |  | 1,057,454,000 |  |
Number of mortgage loans on real estate | loan |  |  | 38 | 0 | 237 | 26 |  |  |  |
Aggregate unpaid principal balance of mortgage loans on real estate |  |  | $ 5,200,000 |  | $ 41,200,000 | $ 2,000,000.0 |  |  |  |
Residential NPLs |  |  |  |  |  |  |  |  |  |
Mortgage Loans on Real Estate |  |  |  |  |  |  |  |  |  |
Mortgage loans, net |  |  | $ 36,820,000 |  | $ 36,820,000 |  |  | $ 38,724,000 |  |
Number of mortgage loans on real estate | loan |  |  | 0 | 0 | 3 | 1 |  |  |  |
Aggregate unpaid principal balance of mortgage loans on real estate |  |  |  |  | $ 700,000 | $ 200,000 |  |  |  |
[1] | As of June 30, 2021, balances for Mortgage loans, net include $1.9 million from a 50.0% owned joint venture. As of December 31, 2020, balances for Mortgage loans, net include $307.1 million and Secured borrowings, net of deferred costs includes $250.6 million from 50.0% and 63.0% owned joint ventures, all of which the Company consolidates under U.S. Generally Accepted Accounting Principles ("U.S. GAAP"). The creditors do not have recourse to the primary beneficiary (Great Ajax Corp.). See Note 9 — Debt.
[2] | Mortgage loans, net include $821.6 million and $842.2 million of loans at June 30, 2021 and December 31, 2020, respectively, transferred to securitization trusts that are variable interest entities (“VIEs”); these loans can only be used to settle obligations of the VIEs. Secured borrowings consist of notes issued by VIEs that can only be settled with the assets and cash flows of the VIEs. The creditors do not have recourse to the primary beneficiary (Great Ajax Corp.). See Note 9 — Debt. Mortgage loans, net include $9.8 million and $13.7 million of allowance for loan credit losses at June 30, 2021 and December 31, 2020, respectively.

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