XML 81 R70.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Regulatory Capital Matters (Details Textual) | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
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% |
Additional capital conservation buffer ratio | 1.25% | 0.625%
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%

X
- Definition Additional capital conservation buffer ratio. + References No definition available. + Details
Name: | fmnb_AdditionalCapitalConservationBufferRatio
Namespace Prefix: | fmnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Capital required for capital adequacy to risk weighted assets capital conservation buffer ratio. + References No definition available. + Details
Name: | fmnb_CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsCapitalConservationBufferRatio
Namespace Prefix: | fmnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Regulatory Matters (Additional Textual) [Abstract] + References No definition available. + Details
Name: | fmnb_RegulatoryMattersAdditionalTextualAbstract
Namespace Prefix: | fmnb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tier one risk based capital required for capital adequacy to risk weighted assets capital conservation buffer ratio. + References No definition available. + Details
Name: | fmnb_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsCapitalConservationBufferRatio
Namespace Prefix: | fmnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Tier one risk based common capital required for capital adequacy to risk weighted assets. + References No definition available. + Details
Name: | fmnb_TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix: | fmnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Tier one risk based common capital required for capital adequacy to risk weighted assets capital conservation buffer ratio. + References No definition available. + Details
Name: | fmnb_TierOneRiskBasedCommonCapitalRequiredForCapitalAdequacyToRiskWeightedAssetsCapitalConservationBufferRatio
Namespace Prefix: | fmnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 + Details
Name: | us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 + Details
Name: | us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_ConsolidatedEntitiesAxis=us-gaap_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |