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Mortgage Loans - Schedule of loan basis by year of origination (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | $ 955,628 | $ 1,119,372
Great Ajax II REIT |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 566,666 | 424,997
California |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 64,471 | 88,788
2018-C |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 173,221
2017-D |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 133,896
7f7 and better |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 144,518 | 142,235
4f4-6f6 and below |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 151,537 | 126,814
Non-PCD |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 28,436 | 29,421
2021 |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 10,678 |
2021 | Great Ajax II REIT |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 0 |
2021 | California |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 0 |
2021 | 7f7 and better |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 0 |
2021 | 4f4-6f6 and below |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 0 |
2021 | Non-PCD |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 10,678 |
2020 |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 12,212 | 24,480
2020 | Great Ajax II REIT |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 755 | 0
2020 | California |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 1,714 | 2,221
2020 | 2018-C |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 0
2020 | 2017-D |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 0
2020 | 7f7 and better |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 0 | 0
2020 | 4f4-6f6 and below |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 110 | 872
2020 | Non-PCD |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 9,633 | 21,387
2019 |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 7,559 | 7,998
2019 | Great Ajax II REIT |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 180 | 0
2019 | California |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 0 | 952
2019 | 2018-C |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 0
2019 | 2017-D |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 0
2019 | 7f7 and better |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 1,080 | 911
2019 | 4f4-6f6 and below |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 1,733 | 1,397
2019 | Non-PCD |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 4,566 | 4,738
2018 |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 3,585 | 4,293
2018 | Great Ajax II REIT |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 707 | 257
2018 | California |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 635 | 1,484
2018 | 2018-C |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 0
2018 | 2017-D |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 0
2018 | 7f7 and better |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 107 | 434
2018 | 4f4-6f6 and below |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 2,060 | 2,054
2018 | Non-PCD |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 76 | 64
2017 |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 4,069 | 3,800
2017 | Great Ajax II REIT |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 488 | 488
2017 | California |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 368 | 362
2017 | 2018-C |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 0
2017 | 2017-D |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 121
2017 | 7f7 and better |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 427 | 0
2017 | 4f4-6f6 and below |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 195 | 336
2017 | Non-PCD |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 2,591 | 2,493
2016 |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 2,729 | 4,520
2016 | Great Ajax II REIT |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 2,010 | 1,991
2016 | California |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 0 | 0
2016 | 2018-C |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 0
2016 | 2017-D |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 0
2016 | 7f7 and better |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 451 | 2,125
2016 | 4f4-6f6 and below |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 146 | 305
2016 | Non-PCD |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 122 | 99
2009-2015 |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 95,385 | 99,504
2009-2015 | Great Ajax II REIT |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 50,595 | 41,746
2009-2015 | California |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 4,408 | 5,292
2009-2015 | 2018-C |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 14,100
2009-2015 | 2017-D |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 6,826
2009-2015 | 7f7 and better |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 16,202 | 17,520
2009-2015 | 4f4-6f6 and below |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 23,445 | 13,409
2009-2015 | Non-PCD |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 735 | 611
2006-2008 |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 600,210 | 721,689
2006-2008 | Great Ajax II REIT |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 374,493 | 280,606
2006-2008 | California |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 45,819 | 60,393
2006-2008 | 2018-C |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 119,343
2006-2008 | 2017-D |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 94,711
2006-2008 | 7f7 and better |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 90,714 | 88,414
2006-2008 | 4f4-6f6 and below |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 89,161 | 78,202
2006-2008 | Non-PCD |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 23 | 20
2005 and prior |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 219,201 | 253,088
2005 and prior | Great Ajax II REIT |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 137,438 | 99,909
2005 and prior | California |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 11,527 | 18,084
2005 and prior | 2018-C |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 39,778
2005 and prior | 2017-D |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis |  | 32,238
2005 and prior | 7f7 and better |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 35,537 | 32,831
2005 and prior | 4f4-6f6 and below |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | 34,687 | 30,239
2005 and prior | Non-PCD |  |
Mortgage Loans [Line Items] |  |
Mortgage loan portfolio by basis | $ 12 | $ 9

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