XML 126 R111.htm IDEA: XBRL DOCUMENT
v3.22.0.1

Regulatory Matters (Details Textual) - USD ($) | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
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% | 2.50%
Capital conservation buffer, additional capital amount required | $ 68,900,000 | $ 52,900,000
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 | 0.060 | 0.060
Minimum ratio of total capital to risk-weighted assets | 0.080 | 0.080
Minimum leverage ratio | 0.040 | 0.040
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 | 0.060 | 0.060
Minimum ratio of total capital to risk-weighted assets | 0.080 | 0.080
Minimum leverage ratio | 0.040 | 0.040
Dividends that can be declared without prior approval | $ 17,200,000 |
Farmers Trust Company |  |
Regulatory Matters (Additional Textual) [Abstract] |  |
Minimum capital maintained by trust | 3,000,000 |
Dividends that can be declared without prior approval | $ 648,000 |

X
- Definition Capital conservation buffer, additional capital amount required. + References No definition available. + Details
Name: | fmnb_CapitalConservationBufferAdditionalCapitalAmountRequired
Namespace Prefix: | fmnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Capital conservation buffer ratio. + References No definition available. + Details
Name: | fmnb_CapitalConservationBufferRatio
Namespace Prefix: | fmnb_
Data Type: | dtr-types: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: | dtr-types: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: | dtr-types: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: | dtr-types: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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Minimum amount of net capital required to be maintained by broker-dealer parent, calculated under Aggregate Indebtedness Standard. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher SEC -Name Rule 15c3-1 -Number 240 -Section 15c3-1 + Details
Name: | srt_MinimumNetCapitalRequiredForEntity1
Namespace Prefix: | srt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Ratio of minimum total risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of dividends that can be declared or paid without approval of regulatory agency. + References No definition available. + Details
Name: | us-gaap_StatutoryAccountingPracticesStatutoryAmountAvailableForDividendPaymentsWithoutRegulatoryApproval
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Ratio of minimum Tier 1 leverage capital to average assets required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Definition Ratio of minimum Tier 1 risk-based capital to risk-weighted assets required for capital adequacy as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
Name: | us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:pureItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=srt_ParentCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ConsolidatedEntitiesAxis=fmnb_FarmersTrustCompanyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |