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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