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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2014 | Sep. 30, 2018 | Sep. 30, 2017 | Oct. 14, 2016
Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Unfunded loan commitments |  | $ 748,800,000 | $ 233,200,000 |
Commitment to purchase securities |  | 1,430,000 | 0 |
Commitment to sell securities |  | 0 | 0 |
Off-Balance Sheet valuation allowance |  | $ 100,000 | $ 200,000 |
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 |  |  |  | $ 4,001,025

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