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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
Feb. 09, 2018
Sep. 30, 2019
Dec. 24, 2018
Sep. 30, 2018
Oct. 14, 2016
Commitments and Contingencies Disclosure [Abstract]          
Unfunded loan commitments   $ 978,100,000   $ 748,800,000  
Commitment to purchase securities   1,400,000   0  
Commitment to sell securities   0      
Off-Balance Sheet valuation allowance   $ 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 $ 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