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Premises and Equipment (Details 1) $ in Thousands	Dec. 31, 2019 USD ($)
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 3,648
Less: accumulated amortization	(527)
TOTAL	3,121
Buildings
Property Plant And Equipment [Line Items]
Premises and equipment, gross	2,854
Equipment
Property Plant And Equipment [Line Items]
Premises and equipment, gross	$ 794

X

- Definition

Operating lease right-of-use asset accumulated amortization.

+ References

No definition available.

+ Details

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- Definition

Operating lease right-of-use asset gross.

+ References

No definition available.

+ Details

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Namespace Prefix:	fmnb_
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Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

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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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- Details

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