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v3.19.1

Borrowings Schedule of Short-Term and Long-Term Debt (Details) | Mar. 31, 2019 | Dec. 31, 2018
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Line of Credit [Member] |  |
Schedule of Short-Term and Long-Term Debt [Line Items] |  |
Short-term Debt, Weighted Average Interest Rate, at Point in Time | 0.00% | 3.00%

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- Definition [Line Items] for Schedule of Short-Term and Long-Term Debt [Table] + References No definition available. + Details
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Namespace Prefix: | lcnb_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |