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SECURITIES - Narrative (Details) | 6 Months Ended |
--- | --- | ---
Mar. 31, 2023 USD ($) security | Mar. 31, 2022 USD ($) | Sep. 30, 2022 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |
AFS number of securities in an unrealized loss position (in securities) | security | 192 |  |
Federal reserve bank stock | $ 19,700,000 |  | $ 19,700,000
Federal home loan bank stock | 9,700,000 |  | 9,100,000
Impairment recognized | 500,000 | $ 0 |
Marketable |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 3,500,000 |  | 2,900,000
Unrealized losses on equity securities | 0 | 3,800,000 |
Non-marketable |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Equity securities | 7,700,000 |  | 7,200,000
Unrealized losses on equity securities | 100,000 |  |
Unrealized gains on equity securities |  | $ 300,000 |
Equity securities without readily determinable fair value, amount | $ 17,700,000 |  | $ 18,200,000

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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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