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Regulatory Matters (Details Textual) - USD ($)	Dec. 31, 2019	Dec. 31, 2018
Regulatory Matters (Additional Textual) [Abstract]
Common equity tier 1 capital to risk-weighted assets, capital conservation buffer ratio	2.50%
Tier 1 capital to risk-weighted assets, capital conservation buffer ratio	2.50%
Total capital to risk-weighted assets, capital conservation buffer ratio	2.50%
Capital conservation buffer ratio	2.50%	1.875%
Capital conservation buffer, additional capital amount required	$ 47,800,000	$ 34,400,000
Minimum ratio of common equity tier 1 capital to risk-weighted assets	4.50%	4.50%
Minimum ratio of tier 1 capital to risk-weighted assets	6.00%	6.00%
Minimum ratio of total capital to risk-weighted assets	8.00%	8.00%
Minimum leverage ratio	4.00%	4.00%
Farmers National Banc Corp
Regulatory Matters (Additional Textual) [Abstract]
Minimum ratio of common equity tier 1 capital to risk-weighted assets	4.50%	4.50%
Minimum ratio of tier 1 capital to risk-weighted assets	6.00%	6.00%
Minimum ratio of total capital to risk-weighted assets	8.00%	8.00%
Minimum leverage ratio	4.00%	4.00%
Dividends that can be declared without prior approval	$ 25,200,000
Farmers Trust Company
Regulatory Matters (Additional Textual) [Abstract]
Minimum capital maintained by trust	3,000,000
Dividends that can be declared without prior approval	$ 273,000

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Regulatory Matters (Additional Textual) [Abstract]

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Tier one risk based capital required for capital adequacy to risk weighted assets capital conservation buffer ratio.

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Tier one risk based common capital required for capital adequacy to risk weighted assets.

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Minimum amount of net capital required to be maintained by broker-dealer parent, calculated under Aggregate Indebtedness Standard.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher SEC
-Name Rule 15c3-1
-Number 240
-Section 15c3-1

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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Amount of dividends that can be declared or paid without approval of regulatory agency.

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-Topic 235
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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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