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SIGNIFICANT EVENTS - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Provision for loan and lease losses | $ 8,980 | $ 15,093 | $ 37,296 | $ 3,407 | $ 4,121 | $ 9,112 | $ 33,318 | $ 9,099 | $ 4,706 | $ 5,315 | $ 18,343 | $ 1,068 | $ 64,776 | $ 55,650 | $ 29,432
Covid-19 Pandemic |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loans and lease receivables deferred income | 170,000 |  |  |  |  |  |  |  |  |  |  |  | 170,000 |  |
Current | $ 23,300 |  |  |  |  |  |  |  |  |  |  |  | 23,300 |  |
Provision for loan and lease losses |  |  |  |  |  |  |  |  |  |  |  |  | $ 26,400 |  |

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