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OTHER REAL ESTATE OWNED (Details Narrative) $ in Thousands	Dec. 31, 2023 USD ($)
OTHER REAL ESTATE OWNED
Recorded investments of consumer mortgage loans	$ 613

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Namespace Prefix:	fmbm_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration