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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2014
Mar. 31, 2018
Sep. 30, 2017
Oct. 14, 2016
Loss Contingencies [Line Items]        
Unfunded loan commitments   $ 289.0 $ 233.2  
Inter National Bank [Member]        
Loss Contingencies [Line Items]        
Amount of shortfall in depository account $ 10.5      
Card Limited, LLC v. MetaBank dba Meta Payment Systems [Member]        
Loss Contingencies [Line Items]        
Estimate of possible loss       $ 4.0