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LOANS AND LEASES, NET - Troubled Debt Restructured Loans (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
National Lending |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
TDRs recorded investment | $ 1,400,000 | $ 100,000 | $ 5,500,000 | $ 1,700,000
TDRs subsequent default, recorded investment |  |  | 1,300,000 | 0
Community Banking |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
TDRs recorded investment | $ 0 | $ 700,000 | 600,000 | 700,000
TDRs subsequent default, recorded investment |  |  | $ 3,300,000 | $ 900,000

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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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