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GOODWILL AND INTANGIBLE ASSETS - Narrative (Details) | 12 Months Ended |
--- | --- | ---
Sep. 30, 2020 USD ($) Lease | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2020 USD ($)
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Goodwill | $ 309,505,000 | $ 309,505,000 | $ 303,270,000 |
Goodwill impairment | 0 |  |  | $ 0
Impairments to intangible assets | $ 0 | $ 111,000 | $ 18,000 |
DC Solar |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Number of operating leases | Lease | 3 |  |  |
Net increase to liabilities and goodwill recognized | $ 3,800,000 |  |  |
Crestmark Bancorp, Inc. |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |
Number of operating leases | Lease | 2 |  |  |

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(10)(1)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120320667&loc=SL49117168-202975 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
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