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REGULATORY CAPITAL (Details)
Jan. 01, 2019
Sep. 30, 2018
Sep. 30, 2017
Magyar Bank [Member]      
Tier 1 leverage ratio      
Tier 1 leverage ratio (to average assets) ratio   8.61% 8.41%
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   11.53% 11.75%
Required amount of common equity Tier 1 Capital for adequacy purposes effective, ratio   6.375% [1] 5.75% [2]
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   11.53% 11.75%
Required amount of Tier 1 Capital for adequacy purposes effective, ratio   7.875% [1] 7.25% [2]
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   12.44% 12.57%
Required amount of capital for adequacy purposes effective, ratio   9.875% [1] 9.25% [2]
Minimum Capital required to be well-capitalized, ratio   10.00% 10.00%
Magyar Bank [Member] | Subsequent Event [Member]      
Tier 1 leverage ratio      
Required amount of Tier 1 Capital for adequacy purposes effective, ratio 4.00%    
Required amount of common equity Tier 1 Capital for adequacy purposes effective, ratio [3] 7.00%    
Tier 1 risk-based capital ratio      
Required amount of Tier 1 Capital for adequacy purposes effective, ratio [3] 8.50%    
Total risk-based capital ratio      
Required amount of capital for adequacy purposes effective, ratio [3] 10.50%    
Magyar Bancorp, Inc. [Member]      
Tier 1 leverage ratio      
Tier 1 leverage ratio (to average assets) ratio   8.55% 8.45%
Common Equity Tier 1 Capital (to risk-weighted assets) ratio   11.44% 11.80%
Tier 1 risk-based capital ratio      
Tier 1 risk-based capital ratio (to risk-weighted assets) ratio   11.44% 11.80%
Total risk-based capital ratio      
Total risk-based capital ratio (to risk-weighted assets) ratio   12.35% 12.62%
[1] Includes 1.875% capital conservation buffer
[2] Includes 1.25% capital conservation buffer
[3] Includes 2.50% capital conservation buffer