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COMMITMENTS AND CONTINGENCIES (Details)
Feb. 09, 2018
USD ($)
Mar. 31, 2020
USD ($)
commitment
Sep. 30, 2019
USD ($)
commitment
Dec. 24, 2018
USD ($)
Oct. 14, 2016
USD ($)
Loss Contingencies [Line Items]          
Unfunded loan commitments   $ 985,500,000 $ 978,100,000    
Number of investment commitments | commitment   0 0    
Securities, buy (sell) obligations   $ 0 $ 0    
Off-balance sheet credit exposures   $ 100,000 $ 100,000    
Card Limited, LLC v. MetaBank dba Meta Payment Systems          
Loss Contingencies [Line Items]          
Estimate of possible loss         $ 4,000,000.0
AFS/IBEX, A Division of MetaBank V. Aegis Managing Agency Limited          
Loss Contingencies [Line Items]          
Damages sought amount $ 1,600,000        
Ohio Valley Bank Company V. Metabank dba Refund Advantage, Case No. 18 CV 134          
Loss Contingencies [Line Items]          
Estimate of possible loss       $ 3,000,000.0