Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2020	Nov. 06, 2020
Cover [Abstract]
Document Type	10-Q
Document Period End Date	Sep. 30, 2020
Document Quarterly Report	true
Document Transition Report	false
Entity Registrant Name	LCNB Corp.
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q3
Amendment Flag	false
Entity File Number	001-35292
Entity Incorporation, State or Country Code	OH
Entity Tax Identification Number	31-1626393
Entity Address, Address Line One	2 North Broadway
Entity Address, City or Town	Lebanon
Entity Address, State or Province	OH
Entity Address, Postal Zip Code	45036
City Area Code	(513)
Local Phone Number	932-1414
Title of 12(b) Security	Common Stock, No Par Value
Trading Symbol	LCNB
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		12,878,670
Entity Central Index Key	0001074902