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CAPITAL REQUIREMENTS AND RESTRICTIONS ON RETAINED EARNINGS - Financial Measures of Capital (Details)	Sep. 30, 2019	Sep. 30, 2018
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Tier 1 (core) capital (to adjusted total assets), ratio	8.33%	8.50%
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	10.35%	10.56%
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	10.71%	10.97%
Tier 1 (core) capital (to risk-weighted assets), minimum requirement for capital adequacy purposes, ratio	6.00%	6.00%
Tier 1 (core) capital (to risk-weighted assets), minimum requirement to be well capitalized under prompt corrective action provisions, ratio	8.00%	8.00%
Total qualifying capital (to risk-weighted assets), ratio	13.01%	13.18%
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	9.65%	9.75%
Common equity Tier 1 (to risk-weighted assets), actual ratio	12.31%	12.50%
Tier 1 (core) capital ( to risk weighted assets), ratio	12.37%	12.56%
Total qualifying capital (to risk-weighted assets), ratio	13.02%	12.89%

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- Definition

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

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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.

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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.

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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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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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The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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