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LOANS AND LEASES RECEIVABLE, NET LOANS AND LEASES RECEIVABLE, NET - Schedule of Loans Purchased and Sold, by Portfolio Segment (Details) - USD ($)
$ in Thousands
12 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Loans Purchased      
Loans held for sale $ 15,443 $ 0 $ 0
Loans Held for Investment [Abstract]      
Payments to Acquire Loans Receivable 262,622 165,670 141,403
Total purchases 278,065 165,670  
Loans Sold      
Loans held for sale 125,357 17,621 $ 685,934
Total sales 134,140 40,232  
National Lending      
Loans Held for Investment [Abstract]      
Payments to Acquire Loans Receivable 235,918 137,751  
Loans Sold      
Loans held for sale 121,071 17,621  
Community Banking      
Loans Held for Investment [Abstract]      
Payments to Acquire Loans Receivable 26,704 27,919  
Loans Sold      
Loans held for investment: Total Community Banking $ 13,069 $ 22,611