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COMMITMENTS AND CONTINGENCIES (Details) | Feb. 09, 2018 USD ($) | Mar. 31, 2021 USD ($) commitment | Sep. 30, 2020 USD ($) commitment | Oct. 14, 2016 USD ($)
--- | --- | --- | --- | ---
Loss Contingencies [Line Items] |  |  |  |
Unfunded loan commitments |  | $ 1,280,000,000 | $ 1,220,000,000 |
Number of investment commitments | commitment |  | 0 | 0 |
Securities, buy (sell) obligations |  | $ 0 | $ 0 |
Card Limited, LLC v. MetaBank dba Meta Payment Systems |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Estimate of possible loss |  |  |  | $ 4,000,000.0
AFS/IBEX, A Division of MetaBank V. Aegis Managing Agency Limited |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Damages sought amount | $ 1,600,000 |  |  |

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