Note 5 - Purchased Credit Deteriorated Loans - Accretable Discount on Credit Deteriorated Loans (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Accretable discount, beginning of period	$ 1,113	$ 1,467
Less accretion	13	58
Accretable discount, end of period	$ 1,100	$ 1,409

Amount of accretion recognized for the excess of a loan's cash flows expected to be collected over the investor's initial investment in acquired loans not accounted for as debt securities, with evidence of deterioration of credit quality.

No definition available.

Name:	lcnb_CreditDeterioratedLoansAccreation
Namespace Prefix:	lcnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration