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Regulatory Matters (Details Textual) - USD ($)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
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		1.875%	1.25%
Capital conservation buffer, additional capital amount required		$ 34,400,000	$ 21,000,000
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%
Farmers National Banc Corp | Scenario, Forecast
Regulatory Matters (Additional Textual) [Abstract]
Dividends that can be declared without prior approval	$ 39,000,000
Farmers Trust Company | Scenario, Forecast
Regulatory Matters (Additional Textual) [Abstract]
Minimum capital maintained by trust	3,000,000
Dividends that can be declared without prior approval	$ 603,000

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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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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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Minimum amount of net capital required to be maintained by the entity to engage in securities transactions.

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

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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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