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COMMITMENTS AND CONTINGENCIES (Details) - USD ($)	Feb. 09, 2018	Sep. 30, 2020	Sep. 30, 2019	Oct. 14, 2016
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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