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Related party Transactions - Narrative (Details) |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Apr. 06, 2020 USD ($) | Nov. 22, 2019 USD ($) shares | Jun. 30, 2021 USD ($) loan | Jun. 30, 2020 USD ($) loan | Jun. 30, 2021 USD ($) calendarQuarter loan | Jun. 30, 2020 USD ($) loan | Dec. 31, 2020 USD ($) loan | Dec. 31, 2019 USD ($) loanPool | Jun. 21, 2021 USD ($) | Mar. 14, 2016
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of purchased loans | loan |  |  |  |  |  |  |  | 15 |  |  |
Unpaid principal balance |  |  |  |  |  |  | $ 26,200,000 |  |  |  |
Collateral value |  |  |  |  |  |  | $ 44,200,000 |  |  |  |
Number of sold loans | loan |  |  |  | 760 | 0 |  | 26 |  |  |  |
Carrying value of mortgages | [1],[2] |  |  | $ 955,628,000 |  | $ 955,628,000 |  | $ 1,119,372,000 |  |  |
Loss on sale of mortgage loans |  |  |  |  |  | 0 | $ (705,000) |  |  |  |
Investment In securities |  |  |  | 232,900,000 | $ 0 | 232,900,000 | 61,300,000 |  |  |  |
Investment in debt securities |  |  |  | 424,600,000 |  | 424,600,000 |  | 273,800,000 |  |  |
Proceeds from issuance of preferred stock and warrants, net of offering costs |  | $ 125,000,000.0 |  |  | 130,000,000.0 | $ 0 | 124,977,000 |  |  |  |
Percentage of management fees payable in cash, minimum |  |  |  |  |  | 50.00% |  |  |  |  |
Percentage of management fees payable in cash, maximum |  |  |  |  |  | 100.00% |  |  |  |  |
Management fee payable |  |  |  | 2,267,000 |  | $ 2,267,000 |  | 2,247,000 |  |  |
Percentage of incentive fees payable in cash |  |  |  |  |  | 100.00% |  |  |  |  |
Period of termination of license agreement |  |  |  |  |  | 30 days |  |  |  |  |
2017-D |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unpaid principal balance |  |  |  | $ 133,800,000 |  | $ 133,800,000 |  |  |  |  |
Number of sold loans | loan |  |  |  | 760 |  | 760 |  |  |  |  |
Carrying value of mortgages |  |  |  | $ 129,200,000 |  | $ 129,200,000 |  | $ 133,896,000 |  |  |
Investment in Loan pool LLCs |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  |  |  |  |  |  | 40.40% |  |
Number of entities | loanPool |  |  |  |  |  |  |  |  | 3 |  |
Cash payment in business acquisition |  |  |  |  |  |  |  |  | $ 1,000,000.0 |  |
Ajax E Master Trust | AS Ajax E LLC |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 5.00% |  | 5.00% |  |  |  |  |
AS Ajax E LLC |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage |  |  |  | 16.50% |  | 16.50% |  | 16.50% |  |  | 24.20%
Gaea Real Estate Corp. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of preferred stock and warrants, net of offering costs |  |  | $ 66,300,000 |  |  |  |  |  |  |  |
Private placement share issuance (in shares) | shares |  |  | 4,419,641 |  |  |  |  |  |  |  |
Ownership percentage |  |  | 23.20% | 22.90% |  | 22.90% |  |  |  |  |
Gaea Real Estate Corp. | Third party |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by third parties |  |  | 76.80% | 77.10% |  | 77.10% |  |  |  |  |
Prepaid expenses and other assets |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  | $ 1,346,000 |  | $ 1,346,000 |  | $ 876,000 |  |  |
Financial Asset, Past Due |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Securities past due |  |  |  | 0 |  | 0 |  | 0 |  |  |
Beneficial interests in securitization trusts |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in subordinate notes |  |  |  |  |  | 39,500,000 |  |  |  |  |
Investment in beneficial interests |  |  |  | 39,500,000 |  |  | 7,100,000 |  |  |  |
Senior notes |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in senior notes |  |  |  | 170,000,000.0 |  | 170,000,000.0 | 49,600,000 |  |  |  |
Subordinated debt |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Investment in subordinate notes |  |  |  | $ 23,500,000 |  | $ 23,500,000 | 4,600,000 |  |  |  |
Mortgage loans |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Carrying value of mortgages |  |  |  |  | 26,100,000 |  | 26,100,000 |  |  |  |
Gaea Real Estate Corp. |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Bond principal balance |  |  |  |  |  |  |  | $ 11,000,000.0 |  | $ 11,000,000.0 |
Number of originated SBC loans acquired | loan |  |  |  |  |  | 18 |  | 20 |  |  |
Fixed interest rate |  |  |  |  |  |  |  |  |  | 4.25% |
Servicer |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Purchase Price |  |  |  |  |  |  |  | $ 1,800,000 |  |  |
Unpaid principal balance |  |  |  |  |  |  |  | 2,100,000 |  |  |
Collateral value |  |  |  |  |  |  |  | 3,700,000 |  |  |
Gregory |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  | 7.20% |  | 7.20% |  |  |  |  |
Ceiling for each repurchase facility |  |  |  | $ 12,000,000.0 |  | $ 12,000,000.0 |  |  |  |  |
Gregory | Servicing agreement |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of fair market value of REO |  |  |  |  |  | 1.00% |  |  |  |  |
Percentage of purchase price of REO |  |  |  |  |  | 1.00% |  |  |  |  |
Gregory | Servicing agreement | Minimum |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Servicing fees percentage |  |  |  |  |  | 0.65% |  |  |  |  |
Gregory | Servicing agreement | Maximum |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Servicing fees percentage |  |  |  |  |  | 1.25% |  |  |  |  |
Gregory | Prepaid expenses and other assets |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  | (80,000) |  | $ (80,000) |  | (44,000) |  |  |
Gregory | Prepaid expenses and other assets | Receivable from servicer for REO acquisitions |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  | 0 |  | $ 0 |  | 0 |  |  |
Thetis Asset Management LLC | Management agreement |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Base management fee percentage |  |  |  |  |  | 1.50% |  |  |  |  |
Thetis Asset Management LLC | Amended and restated management agreement |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Management fee payable |  |  |  | 1,000,000.0 |  | $ 1,000,000.0 |  |  |  |  |
Percentage of base management fees payable in cash |  |  |  |  |  | 75.00% |  |  |  |  |
Percentage of base management fee payable in shares of common stock |  |  |  |  |  | 25.00% |  |  |  |  |
Percentage in excess of base management fees payable in cash |  |  |  |  |  | 50.00% |  |  |  |  |
Percentage in excess of base management fees payable in shares |  |  |  |  |  | 50.00% |  |  |  |  |
Period of common shares held as base management fee (at least) |  |  |  |  |  | 3 years |  |  |  |  |
Percentage of remaining incentive fee in excess of book value |  |  |  |  |  | 8.00% |  |  |  |  |
Number of calendar quarters | calendarQuarter |  |  |  |  |  | 8 |  |  |  |  |
Percentage of remaining incentive fee payable in common stock |  |  |  |  |  | 20.00% |  |  |  |  |
Incentive fee payable |  |  |  | $ 0 | $ 0 | $ 0 | $ 0 |  |  |  |
Percentage of independent directors |  |  |  |  |  | 66.67% |  |  |  |  |
Thetis Asset Management LLC | Prepaid expenses and other assets |  |  |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount of transaction |  |  |  |  |  |  |  | $ 18,000 |  |  |
[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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