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ACQUISTIONS - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Aug. 01, 2018
USD ($)
shares
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2019
USD ($)
repossessed_assets
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Business Acquisition [Line Items]              
Number of assets repossessed | repossessed_assets       173      
Number of assets in underlying asset class, identified for repossession | repossessed_assets       176      
Goodwill   $ 307,941   $ 307,941 $ 303,270 $ 98,723 $ 98,723
Crestmark Bancorp, Inc.              
Business Acquisition [Line Items]              
Total consideration paid $ 295,800            
Equity interest issued (in shares) | shares 9,919,512            
Receivables acquired   402,400   402,400      
Goodwill $ 204,547 209,218   209,218      
DC Solar              
Business Acquisition [Line Items]              
Goodwill, period increase (decrease)   $ 2,200          
Stockholders' Equity, Total | DC Solar              
Business Acquisition [Line Items]              
Goodwill, period increase (decrease)       $ (6,600)      
Other Regulatory Assets (Liabilities) | DC Solar              
Business Acquisition [Line Items]              
Goodwill, period increase (decrease)     $ (8,500)