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FAIR VALUE - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Sep. 30, 2021
--- | --- | ---
Financial Assets [Abstract] |  |
Available for sale, at fair value | $ 5,070 | $ 7,747
Mortgage servicing rights | 4,028 | 3,690
U.S. GSE Securities | Residential Mortgage Backed Securities |  |
Financial Assets [Abstract] |  |
Available for sale, at fair value | 410 | 833
Corporate Bonds |  |
Financial Assets [Abstract] |  |
Available for sale, at fair value | 4,660 | 6,914
Recurring [Member] |  |
Financial Assets [Abstract] |  |
Total | 9,098 | 11,437
Recurring [Member] | U.S. GSE Securities | Residential Mortgage Backed Securities |  |
Financial Assets [Abstract] |  |
Available for sale, at fair value | 410 | 833
Recurring [Member] | Corporate Bonds |  |
Financial Assets [Abstract] |  |
Available for sale, at fair value | 4,660 | 6,914
Recurring [Member] | Mortgage Servicing Rights [Member] |  |
Financial Assets [Abstract] |  |
Mortgage servicing rights | 4,028 | 3,690
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] |  |
Financial Assets [Abstract] |  |
Total | 0 | 0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. GSE Securities | Residential Mortgage Backed Securities |  |
Financial Assets [Abstract] |  |
Available for sale, at fair value | 0 | 0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Corporate Bonds |  |
Financial Assets [Abstract] |  |
Available for sale, at fair value | 0 | 0
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mortgage Servicing Rights [Member] |  |
Financial Assets [Abstract] |  |
Mortgage servicing rights | 0 | 0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] |  |
Financial Assets [Abstract] |  |
Total | 5,070 | 7,747
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | U.S. GSE Securities | Residential Mortgage Backed Securities |  |
Financial Assets [Abstract] |  |
Available for sale, at fair value | 410 | 833
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Corporate Bonds |  |
Financial Assets [Abstract] |  |
Available for sale, at fair value | 4,660 | 6,914
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member] | Mortgage Servicing Rights [Member] |  |
Financial Assets [Abstract] |  |
Mortgage servicing rights | 0 | 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Financial Assets [Abstract] |  |
Total | 4,028 | 3,690
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | U.S. GSE Securities | Residential Mortgage Backed Securities |  |
Financial Assets [Abstract] |  |
Available for sale, at fair value | 0 | 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Corporate Bonds |  |
Financial Assets [Abstract] |  |
Available for sale, at fair value | 0 | 0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member] | Mortgage Servicing Rights [Member] |  |
Financial Assets [Abstract] |  |
Mortgage servicing rights | $ 4,028 | $ 3,690

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- Definition Amount of 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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