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REGULATORY CAPITAL (Details)
Sep. 30, 2019
Jan. 01, 2019
Sep. 30, 2018
Magyar Bancorp, Inc. [Member]      
Tier 1 leverage ratio      
Tier 1 leverage ratio (to average assets) ratio 8.94%   8.55%
Common Equity Tier 1 Capital (to risk-weighted assets) ratio 11.84%   11.44%
Tier 1 risk-based capital ratio      
Tier 1 risk-based capital ratio (to risk-weighted assets) ratio 11.84%   11.44%
Total risk-based capital ratio      
Total risk-based capital ratio (to risk-weighted assets) ratio 12.88%   12.35%
Magyar Bank [Member]      
Tier 1 leverage ratio      
Tier 1 leverage ratio (to average assets) ratio 9.03%   8.61%
Required amount of Tier 1 Capital for adequacy purposes effective, ratio 4.00% 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 11.96%   11.53%
Required amount of common equity Tier 1 Capital for adequacy purposes effective, ratio 7.00% [1] 7.00% [1] 6.375% [2]
Minimum common equity Tier 1 Capital required to be well-capitalized, ratio 6.50% [1]   6.50%
Tier 1 risk-based capital ratio      
Tier 1 risk-based capital ratio (to risk-weighted assets) ratio 11.96% [1]   11.53%
Required amount of Tier 1 Capital for adequacy purposes effective, ratio 8.50% [1] 8.50% [1] 7.875% [2]
Minimum Tier 1 Capital required to be well-capitalized, ratio 8.00% [1]   8.00%
Total risk-based capital ratio      
Total risk-based capital ratio (to risk-weighted assets) ratio 12.99% [1]   12.44%
Required amount of capital for adequacy purposes effective, ratio 10.50% [1] 10.50% [1] 9.875% [2]
Minimum Capital required to be well-capitalized, ratio 10.00%   10.00%
[1] Includes 2.50% capital conservation buffer.
[2] Includes 1.875% capital conservation buffer.