FAIR VALUE - QUANTITATIVE INFORMATION ABOUT LEVEL 3 FAIR VALUE MEASURMENTS (RECURRING) (Details) $ in Thousands	Mar. 31, 2022 USD ($) year	Jun. 30, 2021 USD ($) year
Fair Value, Option, Quantitative Disclosures [Line Items]
Available-for-sale	$ 229,510	$ 187,335
Non-Agency MBS
Fair Value, Option, Quantitative Disclosures [Line Items]
Available-for-sale	151,479	67,615
Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
Available-for-sale	151,479	67,615
Mortgage servicing rights	23,519	17,911
Recurring
Fair Value, Option, Quantitative Disclosures [Line Items]
Available-for-sale	229,510	187,335
Mortgage servicing rights	23,519	17,911
Recurring \| Non-Agency MBS
Fair Value, Option, Quantitative Disclosures [Line Items]
Available-for-sale	151,479	67,615
Recurring \| Level 3
Fair Value, Option, Quantitative Disclosures [Line Items]
Available-for-sale	151,479	67,615
Mortgage servicing rights	23,519	17,911
Recurring \| Level 3 \| Non-Agency MBS
Fair Value, Option, Quantitative Disclosures [Line Items]
Available-for-sale	$ 151,479	$ 67,615
Recurring \| Level 3 \| Non-Agency MBS \| Projected Constant Prepayment Rate \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.000	0.000
Recurring \| Level 3 \| Non-Agency MBS \| Projected Constant Prepayment Rate \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.300	0.250
Recurring \| Level 3 \| Non-Agency MBS \| Projected Constant Prepayment Rate \| Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.193	0.027
Recurring \| Level 3 \| Non-Agency MBS \| Projected Constant Default Rate \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.000	0.000
Recurring \| Level 3 \| Non-Agency MBS \| Projected Constant Default Rate \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.067	0.056
Recurring \| Level 3 \| Non-Agency MBS \| Projected Constant Default Rate \| Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.020	0.006
Recurring \| Level 3 \| Non-Agency MBS \| Projected Loss Severity \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.000	0.000
Recurring \| Level 3 \| Non-Agency MBS \| Projected Loss Severity \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.683	1.000
Recurring \| Level 3 \| Non-Agency MBS \| Projected Loss Severity \| Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.249	0.194
Recurring \| Level 3 \| Non-Agency MBS \| Discount Rate \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.027	0.027
Recurring \| Level 3 \| Non-Agency MBS \| Discount Rate \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.065	0.072
Recurring \| Level 3 \| Non-Agency MBS \| Discount Rate \| Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Securities available-for-sale, measurement input	0.028	0.031
Recurring \| Level 3 \| Mortgage Servicing Rights
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage servicing rights	$ 23,519	$ 17,911
Recurring \| Level 3 \| Mortgage Servicing Rights \| Projected Constant Prepayment Rate \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage servicing right, measurement input	0.098	0.075
Recurring \| Level 3 \| Mortgage Servicing Rights \| Projected Constant Prepayment Rate \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage servicing right, measurement input	0.510	0.374
Recurring \| Level 3 \| Mortgage Servicing Rights \| Projected Constant Prepayment Rate \| Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage servicing right, measurement input	0.134	0.115
Recurring \| Level 3 \| Mortgage Servicing Rights \| Discount Rate \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage servicing right, measurement input	0.095	0.095
Recurring \| Level 3 \| Mortgage Servicing Rights \| Discount Rate \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage servicing right, measurement input	0.113	0.130
Recurring \| Level 3 \| Mortgage Servicing Rights \| Discount Rate \| Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage servicing right, measurement input	0.095	0.096
Recurring \| Level 3 \| Mortgage Servicing Rights \| Life (in years) \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage servicing right, measurement input \| year	1.4	1.7
Recurring \| Level 3 \| Mortgage Servicing Rights \| Life (in years) \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage servicing right, measurement input \| year	8.6	7.5
Recurring \| Level 3 \| Mortgage Servicing Rights \| Life (in years) \| Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Mortgage servicing right, measurement input \| year	7.2	6.4
Recurring \| Level 3 \| Derivative Instruments, net
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative Instruments	$ 1,150	$ 2,205
Recurring \| Level 3 \| Derivative Instruments, net \| Projected Sales Profit of Underlying Loans \| Minimum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative instruments, net, measurement input	(0.010)	0.002
Recurring \| Level 3 \| Derivative Instruments, net \| Projected Sales Profit of Underlying Loans \| Maximum
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative instruments, net, measurement input	0.002	0.005
Recurring \| Level 3 \| Derivative Instruments, net \| Projected Sales Profit of Underlying Loans \| Weighted Average
Fair Value, Option, Quantitative Disclosures [Line Items]
Derivative instruments, net, measurement input	(0.002)	0.003

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleExcludingAccruedInterest
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Value of input used to measure investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Value of input used to measure derivative asset.

+ References

+ Details

Name:	us-gaap_DerivativeAssetMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Definition

Fair value of the assets less the liabilities of a derivative or group of derivatives.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13433-108611

+ Details

Name:	us-gaap_DerivativeFairValueOfDerivativeNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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:	us-gaap_FairValueOptionQuantitativeDisclosuresLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122492-111745

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122625-111746

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 45
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6469459&loc=d3e122501-111745

+ Details

Name:	us-gaap_ServicingAssetAtFairValueAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Value of input used to measure servicing asset.

+ References

+ Details

Name:	us-gaap_ServicingAssetMeasurementInput
Namespace Prefix:	us-gaap_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentAxis=ax_NonAgencyResidentialMortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputConstantPrepaymentRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_WeightedAverageMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDefaultRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputLossSeverityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=ax_MortgageServicingRightsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputExpectedTermMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_DerivativeFinancialInstrumentsAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_MeasurementInputTypeAxis=ax_ProjectedProfitofUnderlyingLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: