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DEPOSITS (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Sep. 30, 2020
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Deposits [Abstract] |  |
Aggregate of deposit accounts with a minimum denomination of $250,000 | $ 378.5 | $ 365.6
Aggregated of certificate deposits with balance greater than $250,000 | $ 39.4 | $ 45.6

X
- Definition The aggregate amount of certificate deposits with a balance greater than $100,000 as of the balance sheet date. + References No definition available. + Details
Name: | mgyr_LargeCDs
Namespace Prefix: | mgyr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The aggregate amount of deposit accounts with a minimum denomination of $100,000 as of the balance sheet date. + References No definition available. + Details
Name: | mgyr_LargeDeposits
Namespace Prefix: | mgyr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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