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LOANS AND LEASES, NET - Troubled Debt Restructured Loans (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
National Lending
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs recorded investment	$ 2.1	$ 3.7	$ 2.2	$ 4.1
TDRs subsequent default, recorded investment			0.1	2.9
Community Banking
Financing Receivable, Troubled Debt Restructuring [Line Items]
TDRs recorded investment	$ 0.0	$ 0.0	0.0	0.6
TDRs subsequent default, recorded investment			$ 0.0	$ 3.2

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- Definition

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+ References

No definition available.

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- Definition

Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524

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- Definition

Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524

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