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COMMITMENTS AND CONTINGENCIES (Details) - USD ($) | Feb. 09, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Oct. 14, 2016
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Commitments and Contingencies Disclosure [Abstract] |  |  |  |
Unfunded loan commitments |  | $ 1,220,000,000 | $ 978,100,000 |
Commitment to purchase securities |  | 0 | 0 |
Commitment to sell securities |  | 0 | 0 |
Off-Balance Sheet valuation allowance |  | $ 100,000 | $ 100,000 |
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 | $ 1,600,000 |  |  |

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- Definition The fair value of financial liabilities, which are not recognized in the financial statements (off-balance sheet) because they fail to meet some other criterion for recognition. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121572278&loc=d3e13433-108611 + Details
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