Name:	lcnb_CapitalRequiredForCapitalAdequacyToRiskWeightedAssetsWithCapitalConservationBuffer
Namespace Prefix:	lcnb_
Data Type:	xbrli:pureItemType
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The Tier 1 capital ratio (Common Equity Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

No definition available.

Name:	lcnb_CommonEquityTierOneCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix:	lcnb_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

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

No definition available.

Name:	lcnb_CommonEquityTierOneRiskBasedCapitalRatioRequiredForCapitalAdequacyToRiskWeightedAssetsWithCapitalConservationBuffer
Namespace Prefix:	lcnb_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

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

No definition available.

Name:	lcnb_TierOneRiskBasedCapitalRatioRequiredForCapitalAdequacyToRiskWeightedAssetsWithCapitalConservationBuffer
Namespace Prefix:	lcnb_
Data Type:	xbrli:pureItemType
Balance Type:	na
Period Type:	instant

Ratio of minimum total risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 942
-SubTopic 505
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477270/942-505-50-1

Name:	us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
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Period Type:	instant

Ratio of total risk-based capital to risk-weighted assets as defined by regulatory framework.

Name:	us-gaap_CapitalToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
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Period Type:	instant

Ratio of Common Equity Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.

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Ratio of minimum Tier 1 leverage capital to average assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

Name:	us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
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Period Type:	instant

Ratio of Tier 1 capital to average assets as defined by regulatory framework.

Name:	us-gaap_TierOneLeverageCapitalToAverageAssets
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Data Type:	xbrli:pureItemType
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Ratio of minimum Tier 1 risk-based capital to risk-weighted assets categorized as well capitalized as defined by regulatory framework for prompt corrective action.

Name:	us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:pureItemType
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Period Type:	instant

Ratio of Tier 1 risk-based capital to risk-weighted assets as defined by regulatory framework.