Label	Element	Value
Retained Earnings [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	$ 87,826,000
Common Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	76,977,000
Treasury Stock [Member]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Adjusted Balance	us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterestAdjustedBalance1	(11,665,000)
Accounting Standards Update 2014-09 [Member] | Retained Earnings [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Changes In Accounting Principles, Reclassification To Retained Earnngs From AOCI	lcnb_ChangesInAccountingPrinciplesReclassificationToRetainedEarnngsFromAOCI	$ 525,000