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Mortgage Loans - Schedule of loan acquisition reconciliation between purchase price and par value (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Mortgage Loans on Real Estate
Par	$ 0	$ 11,970
Discount	0	(4,888)
PCD loans
Mortgage Loans on Real Estate
Par	0	227
Discount	0	(37)
Allowance	0	(4)
Purchase Price	0	186
Non-PCD
Mortgage Loans on Real Estate
Par	0	1,952
Discount	0	(747)
Allowance	0	0
Purchase Price	$ 0	$ 1,205

X

- Definition

Discount at acquisition

+ References

No definition available.

+ Details

Name:	ajx_DiscountAtAcquisition
Namespace Prefix:	ajx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Par value at acquisition

+ References

No definition available.

+ Details

Name:	ajx_ParValueAtAcquisition
Namespace Prefix:	ajx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Total loan purchase price

+ References

No definition available.

+ Details

Name:	ajx_TotalLoanPurchasePrice
Namespace Prefix:	ajx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	srt_MortgageLoansOnRealEstateLineItems
Namespace Prefix:	srt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of allowance for credit loss at acquisition date of financing receivable purchased with credit deterioration.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 19
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919265-210447

+ Details

Name:	us-gaap_FinancingReceivablePurchasedWithCreditDeteriorationAllowanceForCreditLossAtAcquisitionDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=ajx_PCDLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_MortgageLoansOnRealEstateLoanTypeAxis=ajx_NonPCDLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: