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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2017 USD ($)
Accounting Policies [Abstract] |
Commercial relationships | $ 500,000
Criticized relationships | $ 250,000

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- Definition The threshold for commerical loan relationships for which external consultants perform reviews for potential loss assessment. + References No definition available. + Details
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Namespace Prefix: | mgyr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The threshold for criticized loan relationships for which external consultants perform reviews for potential loss assessment. + References No definition available. + Details
Name: | mgyr_CriticizedRelationships
Namespace Prefix: | mgyr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration