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Equity - Narrative (Details) |  | 3 Months Ended | 6 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 06, 2020 USD ($) | Jun. 30, 2021 USD ($) entity $ / shares shares | Mar. 31, 2021 shares | Jun. 30, 2020 USD ($) $ / shares shares | Jun. 30, 2021 USD ($) entity $ / shares shares | Jun. 30, 2020 USD ($) $ / shares shares | Dec. 31, 2020 entity $ / shares shares | Mar. 31, 2020 shares | Feb. 28, 2020 USD ($) | Dec. 31, 2019 shares | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 22,993,246 |  |  | 22,993,246 |  | 22,978,339 |  |  |  |
Common stock, par value per share (in dollars per share) | $ / shares |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01 |  |  |  |
Common stock, shares authorized (in shares) |  | 125,000,000 |  |  | 125,000,000 |  | 125,000,000 |  |  |  |
Proceeds from issuance of preferred stock and warrants, net of offering costs | $ | $ 125,000,000.0 |  |  | $ 130,000,000.0 | $ 0 | $ 124,977,000 |  |  |  |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  | $ 0.01 |  |  | $ 0.01 |  | $ 0.01 |  |  |  |
Warrant term |  |  |  | 5 years |  | 5 years |  |  |  |  |
Class of warrant or right, outstanding (in shares) |  | 6,500,000 |  | 6,500,000 | 6,500,000 | 6,500,000 |  |  |  |  |
Investment warrants, exercise price (in dollars per share) | $ / shares |  |  |  | $ 10.00 |  | $ 10.00 |  |  |  |  |
Preferred stock, shares authorized (in shares) |  | 25,000,000 |  |  | 25,000,000 |  | 25,000,000 |  |  |  |
Common stock authorized | $ |  |  |  |  |  |  |  |  | $ 25,000,000.0 |  |
Treasury stock (in shares) |  | 126,609 |  |  | 126,609 |  | 107,243 |  |  |  |
Sale of common stock pursuant to dividend reinvestment plan | $ |  |  |  |  | $ 95,000 | $ 41,000 |  |  |  |  |
Common stock, shares issued (in shares) |  | 22,993,246 |  |  | 22,993,246 |  | 22,978,339 |  |  |  |
Number of non controlling interest subsidiaries | entity |  | 3 |  |  | 3 |  | 4 |  |  |  |
Open market purchases |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury stock (in shares) |  | 48,464 |  |  | 48,464 |  | 48,464 |  |  |  |
At-the-Market Program |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock authorized | $ |  | $ 50,000,000.0 |  |  | $ 50,000,000.0 |  |  |  |  |  |
Common stock, shares issued (in shares) |  | 0 |  | 0 | 0 | 0 |  |  |  |  |
7.25% Series A preferred stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  | 2,307,400 |  | 2,307,400 | 2,307,400 | 2,307,400 | 2,307,400 |  |  |  |
Preferred stock, fixed-to-floating rate cumulative redeemable |  |  |  | 7.25% | 7.25% |  |  |  |  |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  |  |  | $ 25.00 |  | $ 25.00 |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  | 2,307,400 | 2,307,400 | 2,307,400 | 2,307,400 | 2,307,400 | 2,307,400 | 0 |  | 0 |
Preferred stock - Series B shares |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  | 2,892,600 |  | 2,892,600 | 2,892,600 | 2,892,600 | 2,892,600 |  |  |  |
Preferred stock, fixed-to-floating rate cumulative redeemable |  |  |  | 5.00% | 5.00% |  |  |  |  |  |
Preferred stock, par value per share (in dollars per share) | $ / shares |  |  |  | $ 25.00 |  | $ 25.00 |  |  |  |  |
Preferred stock, shares outstanding (in shares) |  | 2,892,600 | 2,892,600 | 2,892,600 | 2,892,600 | 2,892,600 | 2,892,600 | 0 |  | 0 |
Common stock |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) |  | 22,993,246 | 22,988,847 | 22,924,982 | 22,993,246 | 22,924,982 | 22,978,339 | 22,921,935 |  | 22,142,143 |
Issuance of shares under dividend reinvestment plan (in shares) |  | 3,820 | 4,228 | 5,057 | 8,048 | 5,057 |  |  |  |  |
Sale of common stock pursuant to dividend reinvestment plan | $ |  | $ 48,000 |  | $ 41,000 | $ 100,000 | $ 41,000 |  |  |  |  |
Thetis Asset Management LLC |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Treasury stock (in shares) |  | 78,145 |  |  | 78,145 |  | 58,779 |  |  |  |
Investment in AS Ajax E II LLC |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  | 53.10% |  |  | 53.10% |  | 53.10% |  |  |  |
Investment in AS Ajax E II LLC | Third party |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by third parties |  | 46.90% |  |  | 46.90% |  |  |  |  |  |
Investment in AS Ajax E II LLC | Great Ajax Corp |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  | 53.10% |  |  | 53.10% |  | 53.10% |  |  |  |
2017-D |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  | 50.00% |  |  | 50.00% |  |  |  |  |  |
2017-D | Great Ajax Corp |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  | 50.00% |  |  | 50.00% |  | 50.00% |  |  |  |
Great Ajax II REIT | Third party |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by third parties |  | 0.10% |  |  | 0.10% |  | 0.10% |  |  |  |
Great Ajax II REIT | Great Ajax Corp |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  | 99.90% |  |  | 99.90% |  | 99.90% |  |  |  |
2018-C |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership interests in joint venture |  | 37.00% | 37.00% |  | 37.00% |  |  |  |  |  | 37.00%
2018-C | Third party |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by third parties |  | 0.00% |  |  | 0.00% |  |  |  |  |  |
Ownership percentage by parent |  |  |  |  |  |  | 63.00% |  |  |  |
2018-C | Great Ajax Corp |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Ownership percentage by parent |  | 100.00% |  |  | 100.00% |  |  |  |  |  |

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