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FAIR VALUE MEASUREMENTS (Additional information) (Detail)
12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Sep. 30, 2017
USD ($)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs $ 14,937,000 $ 3,269,000 $ 380,000 $ 0
Discount rate        
Other Real Estate Owned, Measurement Input 30.9 10.5    
Maximum [Member]        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 19.86% 26.61%    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 26.68% 21.17%    
Maximum [Member] | Discount rate        
Other Real Estate Owned, Measurement Input   15.0    
Maximum [Member] | Collateral [Member] | Discount rate        
Fair value inputs discount rate 12.00% 12.00%    
Maximum [Member] | Impaired Loans [Member] | Discount rate        
Fair value inputs discount rate 75.00% 75.00%    
Maximum [Member] | SBA | Discount rate        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 19.86% 26.61%    
Maximum [Member] | SBA | Prepayment rate        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 26.68% 21.17%    
Minimum [Member]        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 3.58% 6.82%    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 8.69% 6.80%    
Minimum [Member] | Discount rate        
Other Real Estate Owned, Measurement Input   0.0    
Minimum [Member] | Collateral [Member] | Discount rate        
Fair value inputs discount rate 0.00% 0.00%    
Minimum [Member] | Impaired Loans [Member] | Discount rate        
Fair value inputs discount rate 0.00% 0.00%    
Minimum [Member] | SBA | Discount rate        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 3.58% 6.82%    
Minimum [Member] | SBA | Prepayment rate        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 8.69% 6.80%    
Weighted Average [Member]        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 8.36% 11.11%    
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 17.46% 14.10%    
Weighted Average [Member] | SBA | Discount rate        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Discount Rate 8.36% 11.11%    
Weighted Average [Member] | SBA | Prepayment rate        
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value, Prepayment Speed 17.46% 14.10%