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COMMITMENTS AND CONTINGENCIES (Details) |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 09, 2018 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2018 USD ($) commitment | Dec. 24, 2018 USD ($) | Sep. 30, 2018 USD ($) commitment | Oct. 14, 2016 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |
Unfunded loan commitments |  |  | $ 858,100,000 |  | $ 748,800,000 |
Number of investment commitments | commitment |  |  | 0 |  | 1,400,000 |
Securities, buy (sell) obligations |  |  |  |  | $ 0 |
Concentration Risk, Credit Risk, Financial Instrument, Off-Balance Sheet Valuation Allowance |  |  | $ 100,000 |  | $ 100,000 |
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 |  |  |  |  |  | $ 4,000,000
AFS/IBEX, A Division of MetaBank V. Aegis Managing Agency Limited [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | $ 1,600,000 |  |  |  |  |
Ohio Valley Bank Company V. Metabank dba Refund Advantage, Case No. 18 CV 134 [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Estimate of possible loss |  |  |  | $ 3,000,000 |  |

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