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v3.19.3.a.u2

FAIR VALUE DISCLOSURES (Narrative) (Details) $ in Thousands | 12 Months Ended
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Sep. 30, 2019 USD ($)
Other Real Estate Owned [Member] |
Cumulative write-down of impaired loans | $ 212

X
- Definition Amount of cumulative charge-offs of impaired loans. + References No definition available. + Details
Name: | mgyr_FinancingReceivablesImpairedLoansWriteDownCumulative
Namespace Prefix: | mgyr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=mgyr_OtherRealEstateOwnedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |