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REGULATORY CAPITAL (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Sep. 30, 2016
Magyar Bancorp, Inc. [Member]    
Total Capital    
Total Capital $ 53,936 $ 51,940
Total Capital (to risk-weighted assets) ratio 12.62% 12.55%
Tier 1 Capital (to risk-weighted assets)    
Tier 1 Capital $ 50,461 $ 48,884
Tier 1 Capital (to risk-weighted assets) ratio 11.80% 11.82%
Common Equity Tier 1 Capital $ 50,461 $ 48,884
Common Equity Tier 1 Capital (to risk-weighted assets) ratio 11.80% 11.82%
Tier 1 Leverage Capital (to average assets)    
Tier 1 Capital $ 50,461 $ 48,884
Tier 1 Capital (to average assets) ratio 8.45% 8.53%
Magyar Bank [Member]    
Total Capital    
Total Capital $ 53,726 $ 50,447
Total Capital (to risk-weighted assets) ratio 12.57% 12.19%
Minimum amount of capital for adequacy purposes $ 34,201 $ 33,099
Minimum amount of capital for adequacy purposes, ratio 8.00% 8.00%
Minimum Capital required to be well-capitalized $ 42,751 $ 41,374
Minimum Capital required to be well-capitalized, ratio 10.00% 10.00%
Tier 1 Capital (to risk-weighted assets)    
Tier 1 Capital $ 50,251 $ 47,391
Tier 1 Capital (to risk-weighted assets) ratio 11.75% 11.45%
Minimum amount of Tier 1 Capital for adequacy purposes $ 25,651 $ 24,825
Minimum amount of Tier 1 Capital for adequacy purposes, ratio 6.00% 6.00%
Minimum Tier 1 Capital required to be well-capitalized $ 34,201 $ 33,099
Minimum Tier 1 Capital required to be well-capitalized, ratio 8.00% 8.00%
Common Equity Tier 1 Capital $ 50,251 $ 47,391
Common Equity Tier 1 Capital (to risk-weighted assets) ratio 11.75% 11.45%
Minimum amount of common equity Tier 1 Capital for adequacy purposes $ 19,238 $ 18,618
Minimum amount of common equity Tier 1 Capital for adequacy purposes, ratio 4.50% 4.50%
Minimum common equity Tier 1 Capital required to be well-capitalized $ 27,788 $ 26,893
Minimum common equity Tier 1 Capital required to be well-capitalized, ratio 6.50% 6.50%
Tier 1 Leverage Capital (to average assets)    
Tier 1 Capital $ 50,251 $ 47,391
Tier 1 Capital (to average assets) ratio 8.41% 8.27%
Minimum amount of Tier 1 Capital for adequacy purposes $ 23,892 $ 22,914
Minimum amount of Tier 1 Capital for adequacy purposes, ratio 4.00% 4.00%
Minimum Tier 1 Capital required to be well-capitalized $ 29,865 $ 28,642
Minimum Tier 1 Capital required to be well-capitalized, ratio 5.00% 5.00%