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SECURITIES - Narrative (Details)	6 Months Ended
	Mar. 31, 2022 USD ($) security	Mar. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
AFS number of securities in an unrealized loss position (in securities) | security	80
Federal reserve bank stock	$ 19,700,000		$ 19,700,000
Federal home loan bank stock	9,100,000		8,700,000
Impairment recognized	0
Marketable
Debt Securities, Available-for-sale [Line Items]
Equity securities	3,900,000		12,700,000
Unrealized losses on equity securities	3,800,000	$ 0
Gain on security sold	300,000
Non-marketable
Debt Securities, Available-for-sale [Line Items]
Equity securities	6,200,000		4,600,000
Unrealized gains on equity securities	300,000	$ 200,000
Equity securities without readily determinable fair value, amount	20,900,000		$ 16,000,000
Gain on security sold	$ 100,000

X

- 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
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Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

+ References

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-Publisher FASB
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Amount of realized gain (loss) from sale 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/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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Amount of unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Amount of unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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Federal Home Loan Bank (FHLB) stock represents an equity interest in a FHLB. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Federal Reserve Bank stock represents an equity interest in the Federal Reserve Bank. It does not have a readily determinable fair value because its ownership is restricted and it lacks a market (liquidity).

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Amount, before tax, of other-than-temporary impairment (OTTI) on investment in debt security measured at amortized cost (held-to-maturity), recognized in earnings and other comprehensive income (OCI).

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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.

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