Mortgage Loans - Schedule of Carrying Value of Mortgage Loans (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Mortgage Loans on Real Estate
Carrying value of mortgages	[1],[2]	$ 1,098,629	$ 1,151,469
7f7 and better
Mortgage Loans on Real Estate
Carrying value of mortgages		412,776	419,378
Great Ajax II REIT
Mortgage Loans on Real Estate
Carrying value of mortgages		315,497	216,476
CALIFORNIA
Mortgage Loans on Real Estate
Carrying value of mortgages		200,480	321,863
4f4-6f6 and below
Mortgage Loans on Real Estate
Carrying value of mortgages		164,456	170,318
Originated
Mortgage Loans on Real Estate
Carrying value of mortgages		5,420	23,434
Current
Mortgage Loans on Real Estate
Carrying value of mortgages		605,296	676,143
Current | 7f7 and better
Mortgage Loans on Real Estate
Carrying value of mortgages		231,761	252,815
Current | Great Ajax II REIT
Mortgage Loans on Real Estate
Carrying value of mortgages		247,368	129,812
Current | CALIFORNIA
Mortgage Loans on Real Estate
Carrying value of mortgages		113,120	265,679
Current | 4f4-6f6 and below
Mortgage Loans on Real Estate
Carrying value of mortgages		9,412	6,412
Current | Originated
Mortgage Loans on Real Estate
Carrying value of mortgages		3,635	21,425
30
Mortgage Loans on Real Estate
Carrying value of mortgages		145,258	146,208
30 | 7f7 and better
Mortgage Loans on Real Estate
Carrying value of mortgages		66,809	72,394
30 | Great Ajax II REIT
Mortgage Loans on Real Estate
Carrying value of mortgages		35,519	31,426
30 | CALIFORNIA
Mortgage Loans on Real Estate
Carrying value of mortgages		30,438	37,553
30 | 4f4-6f6 and below
Mortgage Loans on Real Estate
Carrying value of mortgages		12,492	4,835
30 | Originated
Mortgage Loans on Real Estate
Carrying value of mortgages		0	0
60
Mortgage Loans on Real Estate
Carrying value of mortgages		99,438	93,806
60 | 7f7 and better
Mortgage Loans on Real Estate
Carrying value of mortgages		51,058	41,673
60 | Great Ajax II REIT
Mortgage Loans on Real Estate
Carrying value of mortgages		17,831	16,467
60 | CALIFORNIA
Mortgage Loans on Real Estate
Carrying value of mortgages		14,315	14,034
60 | 4f4-6f6 and below
Mortgage Loans on Real Estate
Carrying value of mortgages		15,057	20,782
60 | Originated
Mortgage Loans on Real Estate
Carrying value of mortgages		1,177	850
90
Mortgage Loans on Real Estate
Carrying value of mortgages		207,468	197,015
90 | 7f7 and better
Mortgage Loans on Real Estate
Carrying value of mortgages		61,750	50,602
90 | Great Ajax II REIT
Mortgage Loans on Real Estate
Carrying value of mortgages		14,448	36,785
90 | CALIFORNIA
Mortgage Loans on Real Estate
Carrying value of mortgages		40,643	4,597
90 | 4f4-6f6 and below
Mortgage Loans on Real Estate
Carrying value of mortgages		90,019	103,872
90 | Originated
Mortgage Loans on Real Estate
Carrying value of mortgages		608	1,159
Foreclosure
Mortgage Loans on Real Estate
Carrying value of mortgages		41,169	38,297
Foreclosure | 7f7 and better
Mortgage Loans on Real Estate
Carrying value of mortgages		1,398	1,894
Foreclosure | Great Ajax II REIT
Mortgage Loans on Real Estate
Carrying value of mortgages		331	1,986
Foreclosure | CALIFORNIA
Mortgage Loans on Real Estate
Carrying value of mortgages		1,964	0
Foreclosure | 4f4-6f6 and below
Mortgage Loans on Real Estate
Carrying value of mortgages		37,476	34,417
Foreclosure | Originated
Mortgage Loans on Real Estate
Carrying value of mortgages		$ 0	$ 0

[1] As of March 31, 2020, balances for Mortgage loans, net includes $316.5 million and Secured borrowings, net of deferred costs includes $271.6 million from the 50% and 63% owned joint ventures, respectively. As of December 31, 2019, balances for Mortgage loans, net include $341.8 million and Secured borrowings, net of deferred costs includes $284.8 million from a 50% and 63% owned joint ventures, all of which the Company consolidates under U.S. Generally Accepted Accounting Principles ("U.S. GAAP").

[2] Mortgage loans net include $888.2 million and $908.6 million of loans at March 31, 2020 and December 31, 2019, 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 $16.1 million and $2.0 million of allowance for loan credit losses at March 31, 2020 and December 31, 2019, respectively.