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Mortgage Loans - Schedule Of Loan Basis By Year Of Origination (Details) - Mortgage loans held-for-investment, net - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
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Mortgage Loans [Line Items] |  |
Year one | $ 0 | $ 0
Year two | 0 | 3,610
Year three | 0 | 4,149
Year four | 0 | 2,100
Year five | 716 | 8,385
Year six | 815 | 2,601
Prior years, range 1 | 41,405 | 89,438
Prior years range 2 | 268,213 | 556,092
Prior years range 3 | 91,907 | 198,176
Total | 403,056 | 864,551
2019-D |  |
Mortgage Loans [Line Items] |  |
Prior years, range 1 | 7,641 |
Prior years range 2 | 65,694 |
Prior years range 3 | 19,480 |
Total | 92,815 |
2019-F |  |
Mortgage Loans [Line Items] |  |
Prior years, range 1 | 11,771 |
Prior years range 2 | 60,263 |
Prior years range 3 | 18,350 |
Total | 90,384 |
2020-B |  |
Mortgage Loans [Line Items] |  |
Prior years, range 1 | 11,099 |
Prior years range 2 | 59,241 |
Prior years range 3 | 25,968 |
Total | 96,308 |
2021-A |  |
Mortgage Loans [Line Items] |  |
Year five | 716 |
Year six | 167 |
Prior years, range 1 | 9,090 |
Prior years range 2 | 83,015 |
Prior years range 3 | 28,101 |
Total | 121,089 |
18-1 LLC |  |
Mortgage Loans [Line Items] |  |
Year one | 0 |
Year two | 0 |
Year three | 0 |
Year four | 0 |
Year five | 0 |
Year six | 648 |
Prior years, range 1 | 1,804 |
Prior years range 2 | 0 |
Prior years range 3 | 8 |
Total | $ 2,460 |
GAOP - 7f7 >50 |  |
Mortgage Loans [Line Items] |  |
Year one |  | 0
Year two |  | 2,473
Year three |  | 2,597
Year four |  | 1,370
Year five |  | 6,598
Year six |  | 658
Prior years, range 1 |  | 30,891
Prior years range 2 |  | 190,106
Prior years range 3 |  | 79,110
Total |  | 313,803
GAOP 7f7 Less Than 50 |  |
Mortgage Loans [Line Items] |  |
Year one |  | 0
Year two |  | 546
Year three |  | 137
Year four |  | 0
Year five |  | 215
Year six |  | 0
Prior years, range 1 |  | 2,356
Prior years range 2 |  | 27,368
Prior years range 3 |  | 6,530
Total |  | 37,152
GAOP - 6f6 and below |  |
Mortgage Loans [Line Items] |  |
Year one |  | 0
Year two |  | 591
Year three |  | 1,415
Year four |  | 0
Year five |  | 737
Year six |  | 1,134
Prior years, range 1 |  | 13,343
Prior years range 2 |  | 55,452
Prior years range 3 |  | 14,642
Total |  | 87,314
Great Ajax II REIT - 7f7 >50 |  |
Mortgage Loans [Line Items] |  |
Year one |  | 0
Year two |  | 0
Year three |  | 0
Year four |  | 730
Year five |  | 764
Year six |  | 795
Prior years, range 1 |  | 34,864
Prior years range 2 |  | 243,034
Prior years range 3 |  | 84,634
Total |  | 364,821
Great Ajax II REIT 7f7 Less Than 50 |  |
Mortgage Loans [Line Items] |  |
Year one |  | 0
Year two |  | 0
Year three |  | 0
Year four |  | 0
Year five |  | 71
Year six |  | 14
Prior years, range 1 |  | 2,658
Prior years range 2 |  | 22,360
Prior years range 3 |  | 6,508
Total |  | 31,611
Great Ajax II REIT - 6f6 and below |  |
Mortgage Loans [Line Items] |  |
Year one |  | 0
Year two |  | 0
Year three |  | 0
Year four |  | 0
Year five |  | 0
Year six |  | 0
Prior years, range 1 |  | 5,326
Prior years range 2 |  | 17,772
Prior years range 3 |  | 6,752
Total |  | $ 29,850

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