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Regulatory Matters (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Common equity tier 1 capital ratio
Actual, Amount	$ 222,892	$ 199,201
Actual, Ratio	12.16%	11.86%
Requirement for Capital Adequacy Purposes, Amount	$ 82,478	$ 75,573
Requirement for Capital Adequacy Purposes, Ratio	4.50%	4.50%
Total risk based capital ratio
Actual, Amount	$ 238,742	$ 213,725
Actual, Ratio	13.03%	12.73%
Requirement for Capital Adequacy Purposes, Amount	$ 146,628	$ 134,352
Requirement for Capital Adequacy Purposes, Ratio	8.00%	8.00%
Tier 1 risk based capital ratio
Actual, Amount	$ 225,150	$ 201,410
Actual, Ratio	12.28%	11.99%
Requirement for Capital Adequacy Purposes, Amount	$ 109,971	$ 100,764
Requirement for Capital Adequacy Purposes, Ratio	6.00%	6.00%
Tier 1 leverage ratio
Actual, Amount	$ 225,150	$ 201,410
Actual, Ratio	9.91%	9.50%
Requirement for Capital Adequacy Purposes, Amount	$ 90,900	$ 84,800
Requirement for Capital Adequacy Purposes, Ratio	4.00%	4.00%
Farmers National Banc Corp
Common equity tier 1 capital ratio
Actual, Amount	$ 210,409	$ 192,080
Actual, Ratio	11.51%	11.45%
Requirement for Capital Adequacy Purposes, Amount	$ 82,242	$ 75,462
Requirement for Capital Adequacy Purposes, Ratio	4.50%	4.50%
To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 118,795	$ 109,001
To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	6.50%	6.50%
Total risk based capital ratio
Actual, Amount	$ 224,001	$ 204,395
Actual, Ratio	12.26%	12.19%
Requirement for Capital Adequacy Purposes, Amount	$ 146,209	$ 134,155
Requirement for Capital Adequacy Purposes, Ratio	8.00%	8.00%
To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 182,761	$ 167,694
To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	10.00%	10.00%
Tier 1 risk based capital ratio
Actual, Amount	$ 210,409	$ 192,080
Actual, Ratio	11.51%	11.45%
Requirement for Capital Adequacy Purposes, Amount	$ 109,656	$ 100,616
Requirement for Capital Adequacy Purposes, Ratio	6.00%	6.00%
To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 146,209	$ 134,155
To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	8.00%	8.00%
Tier 1 leverage ratio
Actual, Amount	$ 210,409	$ 192,080
Actual, Ratio	9.32%	9.12%
Requirement for Capital Adequacy Purposes, Amount	$ 90,324	$ 84,253
Requirement for Capital Adequacy Purposes, Ratio	4.00%	4.00%
To be Well Capitalized Under Prompt Corrective Action Provisions, Amount	$ 112,905	$ 105,316
To be Well Capitalized Under Prompt Corrective Action Provisions, Ratio	5.00%	5.00%

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