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LOANS RECEIVABLE, NET (Schedule of Troubled Debt Restructuring) (Details) $ in Thousands | 6 Months Ended
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Mar. 31, 2021 USD ($) Loans
Financing Receivable, Troubled Debt Restructuring [Line Items] |
Number of Loans | Loans | 1
Investment Before TDR Modification | $ 218
Investment After TDR Modification | $ 249
One-to four-family residential [Member] |
Financing Receivable, Troubled Debt Restructuring [Line Items] |
Number of Loans | Loans | 1
Investment Before TDR Modification | $ 218
Investment After TDR Modification | $ 249

X
- Definition Amount of investment in financing receivables (after modification) modified by troubled debt restructurings. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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Period Type: | duration

X
- Definition Amount of investment in financing receivables (before modification) modified by troubled debt restructurings. + References No definition available. + Details
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Namespace Prefix: | mgyr_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
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Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Balance Type: |
Period Type: |