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SECURITIES - Narrative (Details) $ in Millions	3 Months Ended
	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($)	Sep. 30, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
AFS number of securities in an unrealized loss position (in securities) | security	80
Equity securities without readily determinable fair value, amount	$ 15.9		$ 16.0
Gain on security sold	0.1
Federal reserve bank stock	19.7		19.7
Federal home loan bank stock	8.7		8.7
Impairment recognized	0.0
Marketable
Debt Securities, Available-for-sale [Line Items]
Equity securities	9.9		12.7
Unrealized losses on equity securities	2.3
Non-marketable
Debt Securities, Available-for-sale [Line Items]
Equity securities	5.6		$ 4.6
Unrealized losses on equity securities	$ 0.3
Unrealized gains on equity securities		$ 0.1

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

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-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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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

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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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