FAIR VALUE - Significant Inputs Utilized in Cash Flow Models (Details) $ in Thousands	6 Months Ended	12 Months Ended
Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)
Fair Value Hierarchy [Abstract]
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Nonrecurring [Member]
Fair Value Hierarchy [Abstract]
Financial instruments measured at fair value	$ 0	$ 0
Impaired loans, related specific allowance	$ 0	$ 0
SBA Loans [Member]
Fair Value Hierarchy [Abstract]
Servicing rights, valuation technique [Extensible List]	us-gaap:ValuationTechniqueDiscountedCashFlowMember
Significant Unobservable Inputs (Level 3) [Member] \| Discount Rate [Member] \| Minimum
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input	0.120	0.120
Significant Unobservable Inputs (Level 3) [Member] \| Discount Rate [Member] \| Minimum \| SBA Loans [Member]
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input	0.0133
Significant Unobservable Inputs (Level 3) [Member] \| Discount Rate [Member] \| Maximum
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input	0.145	0.145
Significant Unobservable Inputs (Level 3) [Member] \| Discount Rate [Member] \| Maximum \| SBA Loans [Member]
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input	0.2268
Significant Unobservable Inputs (Level 3) [Member] \| Prepayment Rate [Member]
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input	0.2625
Significant Unobservable Inputs (Level 3) [Member] \| Prepayment Rate [Member] \| Minimum
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input		0.2418
Significant Unobservable Inputs (Level 3) [Member] \| Prepayment Rate [Member] \| Minimum \| SBA Loans [Member]
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input	0.0923
Significant Unobservable Inputs (Level 3) [Member] \| Prepayment Rate [Member] \| Maximum
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input		0.2433
Significant Unobservable Inputs (Level 3) [Member] \| Prepayment Rate [Member] \| Maximum \| SBA Loans [Member]
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input	0.2363
Significant Unobservable Inputs (Level 3) [Member] \| Weighted Average Life [Member] \| Minimum
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input	1 year 8 months 23 days	1 year 11 months 15 days
Significant Unobservable Inputs (Level 3) [Member] \| Weighted Average Life [Member] \| Minimum \| SBA Loans [Member]
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input	1 month 28 days
Significant Unobservable Inputs (Level 3) [Member] \| Weighted Average Life [Member] \| Maximum
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input	3 years 7 days	3 years 3 months 18 days
Significant Unobservable Inputs (Level 3) [Member] \| Weighted Average Life [Member] \| Maximum \| SBA Loans [Member]
Fair Value Hierarchy [Abstract]
Servicing rights, measurement input	5 years 10 months 28 days

Fair value of asset after deduction of liability.

No definition available.

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- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5212-111524

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- Definition

Value of input used to measure servicing asset.

+ 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

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- Definition

Indicates valuation technique for measuring servicing asset.

+ 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)(1)
-URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258

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- Definition

Weighted average life of financial assets and financial liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 2
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125521744&loc=d3e122596-111746

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- References

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