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LOANS AND LEASES, NET - Troubled Debt Restructured Loans (Details) - USD ($) $ in Millions | 3 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
National Lending |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
TDRs recorded investment | $ 0.1 | $ 0.4
TDRs subsequent default, recorded investment | 0.4 | 0.3
Community Banking |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |
TDRs recorded investment | 0.0 | 0.6
TDRs subsequent default, recorded investment | $ 0.0 | $ 1.2

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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 + Details
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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 + Details
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