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INVESTMENT SECURITIES (Summary of Maturities of Debt Securities and Mortgage-backed Securities Available For Sale) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Available for Sale Securities, Amortized Cost    
Due within 1 year     
Due after 1 but within 5 years     
Due after 5 but within 10 years     
Due after 10 years     
Total debt securities     
Mortgage Backed Securities, Residential 9,055mgyr_AvailableForSaleSecuritiesResidentialMortgageMaturitiesAmortizedCost  
Mortgage Backed Securities, Commercial     
Amortized Cost 9,055us-gaap_AvailableForSaleSecuritiesAmortizedCost 12,183us-gaap_AvailableForSaleSecuritiesAmortizedCost
Available for Sale Securities, Fair Value    
Due within 1 year     
Due after 1 but within 5 years     
Due after 5 but within 10 years     
Due after 10 years     
Total debt securities     
Mortgage Backed Securities, Residential 9,003mgyr_AvailableForSaleSecuritiesResidentialMortgageSecurities  
Mortgage Backed Securities, Commercial     
Fair Value $ 9,003us-gaap_AvailableForSaleSecurities $ 12,070us-gaap_AvailableForSaleSecurities