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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
3 Months Ended
Dec. 31, 2014
Sep. 30, 2018
Sep. 30, 2017
Oct. 14, 2016
Commitments and Contingencies Disclosure [Abstract]        
Unfunded loan commitments   $ 748,800,000 $ 233,200,000  
Commitment to purchase securities   1,430,000 0  
Commitment to sell securities   0 0  
Off-Balance Sheet valuation allowance   $ 100,000 $ 200,000  
Inter National Bank [Member]        
Loss Contingencies [Line Items]        
Amount of shortfall in depository account $ 10,500,000      
Card Limited, LLC v. MetaBank dba Meta Payment Systems [Member]        
Loss Contingencies [Line Items]        
Estimate of possible loss       $ 4,001,025