Mortgage Loans - Schedule of carrying value of mortgage loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	$ 413,916	$ 864,551
Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	108,868	55,718
GAOP - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		313,803
GAOP - 7f7 >50 | Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	108,868	55,718
GAOP 7f7 Less Than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		37,152
GAOP - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		87,314
Great Ajax II REIT - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	356,076	364,821
Great AJAX REIT 7f7 less than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	31,344	31,611
Great Ajax II REIT - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	26,496	29,850
Current | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	316,550	558,780
Current | Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	33,232	1,284
Current | GAOP - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		199,229
Current | GAOP - 7f7 >50 | Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	33,232	1,284
Current | GAOP 7f7 Less Than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		20,514
Current | GAOP - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		8,565
Current | Great Ajax II REIT - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	287,327	300,506
Current | Great AJAX REIT 7f7 less than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	24,997	25,592
Current | Great Ajax II REIT - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	4,226	4,374
30 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	50,232	106,557
30 | Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	20,148	592
30 | GAOP - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		49,868
30 | GAOP - 7f7 >50 | Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	20,148	592
30 | GAOP 7f7 Less Than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		7,516
30 | GAOP - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		6,906
30 | Great Ajax II REIT - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	43,191	36,277
30 | Great AJAX REIT 7f7 less than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	3,558	3,846
30 | Great Ajax II REIT - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	3,483	2,144
60 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	12,048	1,625
60 | Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	20,466	0
60 | GAOP - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		283
60 | GAOP - 7f7 >50 | Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	20,466	0
60 | GAOP 7f7 Less Than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		78
60 | GAOP - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		421
60 | Great Ajax II REIT - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	8,366	801
60 | Great AJAX REIT 7f7 less than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	443	42
60 | Great Ajax II REIT - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	3,239	0
90 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	27,637	161,119
90 | Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	27,954	26,243
90 | GAOP - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		63,498
90 | GAOP - 7f7 >50 | Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	27,954	26,243
90 | GAOP 7f7 Less Than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		9,044
90 | GAOP - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		45,058
90 | Great Ajax II REIT - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	16,455	26,600
90 | Great AJAX REIT 7f7 less than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	2,346	2,131
90 | Great Ajax II REIT - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	8,836	14,788
Foreclosure | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	7,449	36,470
Foreclosure | Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	7,068	27,599
Foreclosure | GAOP - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		925
Foreclosure | GAOP - 7f7 >50 | Mortgage loans held-for-sale, net
Mortgage Loans on Real Estate
Total	7,068	27,599
Foreclosure | GAOP 7f7 Less Than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		0
Foreclosure | GAOP - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total		26,364
Foreclosure | Great Ajax II REIT - 7f7 >50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	737	637
Foreclosure | Great AJAX REIT 7f7 less than 50 | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	0	0
Foreclosure | Great Ajax II REIT - 6f6 and below | Mortgage loans held-for-investment, net
Mortgage Loans on Real Estate
Total	$ 6,712	$ 8,544