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Mortgage Loans - Schedule of loan basis by year of origination (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	$ 1,080,617
Great Ajax II REIT
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	308,596
7f7 and better
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	232,821
4f4-6f6 and below
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	174,855
2018-C
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	137,123
CALIFORNIA
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	118,748
2017-D
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	103,080
Non-PCD
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	5,394
Year 2020
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2020 | Great Ajax II REIT
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2020 | 7f7 and better
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2020 | 4f4-6f6 and below
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2020 | 2018-C
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2020 | CALIFORNIA
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2020 | 2017-D
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2020 | Non-PCD
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2019
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	783
Year 2019 | Great Ajax II REIT
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2019 | 7f7 and better
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2019 | 4f4-6f6 and below
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2019 | 2018-C
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2019 | CALIFORNIA
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2019 | 2017-D
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2019 | Non-PCD
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	783
Year 2018
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	1,502
Year 2018 | Great Ajax II REIT
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2018 | 7f7 and better
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	152
Year 2018 | 4f4-6f6 and below
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2018 | 2018-C
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2018 | CALIFORNIA
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2018 | 2017-D
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	106
Year 2018 | Non-PCD
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	1,244
Year 2017
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	3,604
Year 2017 | Great Ajax II REIT
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	225
Year 2017 | 7f7 and better
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	265
Year 2017 | 4f4-6f6 and below
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2017 | 2018-C
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	123
Year 2017 | CALIFORNIA
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	349
Year 2017 | 2017-D
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	136
Year 2017 | Non-PCD
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	2,506
Year 2016
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	4,164
Year 2016 | Great Ajax II REIT
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	1,097
Year 2016 | 7f7 and better
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	2,044
Year 2016 | 4f4-6f6 and below
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2016 | 2018-C
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	0
Year 2016 | CALIFORNIA
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	215
Year 2016 | 2017-D
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	707
Year 2016 | Non-PCD
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	101
Years 2009-2015
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	98,660
Years 2009-2015 | Great Ajax II REIT
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	32,025
Years 2009-2015 | 7f7 and better
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	23,419
Years 2009-2015 | 4f4-6f6 and below
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	13,934
Years 2009-2015 | 2018-C
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	7,100
Years 2009-2015 | CALIFORNIA
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	5,862
Years 2009-2015 | 2017-D
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	15,624
Years 2009-2015 | Non-PCD
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	696
Years 2006-2008
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	719,696
Years 2006-2008 | Great Ajax II REIT
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	208,799
Years 2006-2008 | 7f7 and better
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	144,510
Years 2006-2008 | 4f4-6f6 and below
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	120,362
Years 2006-2008 | 2018-C
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	95,544
Years 2006-2008 | CALIFORNIA
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	89,475
Years 2006-2008 | 2017-D
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	60,952
Years 2006-2008 | Non-PCD
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	54
Years 2005 and prior
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	252,208
Years 2005 and prior | Great Ajax II REIT
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	66,450
Years 2005 and prior | 7f7 and better
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	62,431
Years 2005 and prior | 4f4-6f6 and below
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	40,559
Years 2005 and prior | 2018-C
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	34,356
Years 2005 and prior | CALIFORNIA
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	22,847
Years 2005 and prior | 2017-D
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	25,555
Years 2005 and prior | Non-PCD
Mortgage Loans [Line Items]
Mortgage loan portfolio by basis	$ 10

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- Definition

Mortgage Loans

+ References

No definition available.

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- Definition

The balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1(c))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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