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COMMITMENTS AND CONTINGENCIES (Details)	3 Months Ended	9 Months Ended
	Dec. 31, 2014 USD ($)	Jun. 30, 2018 USD ($) commitment	Sep. 30, 2017 USD ($)	Oct. 14, 2016 USD ($)
Loss Contingencies [Line Items]
Unfunded loan commitments		$ 282,800,000	$ 233,200,000
Number of investment commitments | commitment		2
Securities, buy (sell) obligations		$ 4,100,000	$ 0
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				$ 4,000,000
Meta Capital, LLC [Member]
Loss Contingencies [Line Items]
Investment Company, Committed Capital		$ 500,000

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