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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Financial Measures of Capital (Details)	Sep. 30, 2025	Sep. 30, 2024
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 (core) capital (to adjusted total assets), ratio	9.79%	9.05%
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	12.70%	12.26%
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	0.1295	0.1252
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	14.27%	14.14%
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	10.00%	9.22%
Common equity Tier 1 (to risk-weighted assets), actual ratio	13.23%	12.78%
Tier 1 (core) capital ( to risk weighted assets), ratio	0.1323	0.1278
Total qualifying capital (to risk-weighted assets), ratio	14.19%	14.03%

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- Definition

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

+ References

No definition available.

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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

No definition available.

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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.

+ References

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- Definition

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

No definition available.

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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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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-Section 50
-Paragraph 1
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-Publisher FASB
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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
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
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-Section 50
-Paragraph 1B
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

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

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-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
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