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REGULATORY CAPITAL (Details)		Sep. 30, 2020	Sep. 30, 2019
Magyar Bancorp, Inc. [Member]
Tier 1 leverage ratio
Tier 1 leverage ratio (to average assets) ratio		7.84%	8.94%
Common Equity Tier 1 Capital (to risk-weighted assets) ratio		11.84%	11.84%
Tier 1 risk-based capital ratio
Tier 1 risk-based capital ratio (to risk-weighted assets) ratio		11.84%	11.84%
Total risk-based capital ratio
Total risk-based capital ratio (to risk-weighted assets) ratio		13.09%	12.88%
Magyar Bank [Member]
Tier 1 leverage ratio
Tier 1 leverage ratio (to average assets) ratio		8.30%	9.03%
Required amount of Tier 1 Capital for adequacy purposes effective, ratio		4.00%	4.00%
Minimum Tier 1 Capital required to be well-capitalized, ratio		5.00%	5.00%
Common Equity Tier 1 Capital (to risk-weighted assets) ratio		11.93%	11.96%
Required amount of common equity Tier 1 Capital for adequacy purposes effective, ratio	[1]	7.00%	7.00%
Minimum common equity Tier 1 Capital required to be well-capitalized, ratio		6.50%	6.50%
Tier 1 risk-based capital ratio
Tier 1 risk-based capital ratio (to risk-weighted assets) ratio		11.93%	11.96%
Required amount of Tier 1 Capital for adequacy purposes effective, ratio	[1]	8.50%	8.50%
Minimum Tier 1 Capital required to be well-capitalized, ratio		8.00%	8.00%
Total risk-based capital ratio
Total risk-based capital ratio (to risk-weighted assets) ratio		13.18%	12.99%
Required amount of capital for adequacy purposes effective, ratio	[1]	10.50%	10.50%
Minimum Capital required to be well-capitalized, ratio		10.00%	10.00%
[1] Includes 2.50% capital conservation buffer

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- Definition

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

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Ratio of minimum total 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 total risk-based capital to risk-weighted assets as defined by regulatory framework.

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Represents the minimum amount of common equity 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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- Definition

Represents the minimum amount of common equity Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

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- Definition

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

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Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework.

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Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

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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.

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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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