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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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