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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Financial Measures of Capital (Details)	Sep. 30, 2021	Sep. 30, 2020
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 (core) capital (to adjusted total assets), ratio	7.67%	6.58%
Tier 1 (core) capital (to adjusted total assets), minimum requirement for capital adequacy purposes, ratio	4.00%	4.00%
Tier 1 (core) capital (to adjusted total assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio	5.00%	5.00%
Common equity Tier 1 (to risk-weighted assets), actual ratio	12.12%	11.78%
Common equity Tier 1 (to risk-weighted assets), minimum requirement for capital adequacy purposes, ratio	4.50%	4.50%
Common equity Tier 1 (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio	6.50%	6.50%
Tier 1 (core) capital ( to risk weighted assets), ratio	0.1246	0.1218
Tier 1 (core) capital (to risk-weighted assets), minimum requirement for capital adequacy purposes, ratio	0.0600	0.0600
Tier 1 (core) capital (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio	0.0800	0.0800
Total qualifying capital (to risk-weighted assets), ratio	15.45%	15.30%
Total qualifying capital (to risk-weighted assets), minimum requirement for capital adequacy purposes, ratio	8.00%	8.00%
Total qualifying capital (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio	10.00%	10.00%
MetaBank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 (core) capital (to adjusted total assets), ratio	8.69%	7.56%
Common equity Tier 1 (to risk-weighted assets), actual ratio	14.11%	13.96%
Tier 1 (core) capital ( to risk weighted assets), ratio	0.1413	0.1400
Total qualifying capital (to risk-weighted assets), ratio	15.38%	15.26%

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- Definition

Tier 1 common equity divided by risk weighted assets as defined by regulations.

+ References

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The minimum Tier One risk weighted assets ratio required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Tier 1 risk-weighted assets required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

+ References

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The total qualifying capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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The amount of Tier 1 Risk Based Capital ratio required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

+ References

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Tier one (core) capital divided by adjusted total assets.

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The minimum Tier One risk based capital ratio required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum total qualifying capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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Total qualifying capital divided by risk weighted assets as defined in the regulations.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 505
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826

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Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

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