Fair Value Measurements (Details) $ in Thousands	9 Months Ended
Sep. 30, 2015 USD ($) Fund	Dec. 31, 2014 USD ($)
Fair Value Disclosures [Abstract]
Number of mutual funds that invest in debt securities or loans that qualify for credit under the Community Reinvestment Act \| Fund	4
Redemption notice required to be given to convert capital account, number of days	60 days
Recurring [Member]
Investment securities available-for-sale [Abstract]
U.S. Treasury notes	$ 91,132	$ 62,560
U.S. Agency notes	112,398	83,637
U.S. Agency mortgage-backed securities	26,328	38,032
Certificates of deposit with other banks	2,086	3,086
Municipal securities:
Non-taxable	99,769	77,395
Taxable	25,641	16,395
Mutual funds	2,480	2,461
Trust preferred securities	49	50
Equity securities	858	1,749
Total recurring fair value measurements	360,741	285,365
Recurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Investment securities available-for-sale [Abstract]
U.S. Treasury notes	91,132	62,560
U.S. Agency notes	0	0
U.S. Agency mortgage-backed securities	0	0
Certificates of deposit with other banks	0	0
Municipal securities:
Non-taxable	0	0
Taxable	0	0
Mutual funds	1,480	1,461
Trust preferred securities	49	50
Equity securities	858	1,749
Total recurring fair value measurements	93,519	65,820
Recurring [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Investment securities available-for-sale [Abstract]
U.S. Treasury notes	0	0
U.S. Agency notes	112,398	83,637
U.S. Agency mortgage-backed securities	26,328	38,032
Certificates of deposit with other banks	2,086	3,086
Municipal securities:
Non-taxable	99,769	77,395
Taxable	25,641	16,395
Mutual funds	1,000	1,000
Trust preferred securities	0	0
Equity securities	0	0
Total recurring fair value measurements	267,222	219,545
Recurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Investment securities available-for-sale [Abstract]
U.S. Treasury notes	0	0
U.S. Agency notes	0	0
U.S. Agency mortgage-backed securities	0	0
Certificates of deposit with other banks	0	0
Municipal securities:
Non-taxable	0	0
Taxable	0	0
Mutual funds	0	0
Trust preferred securities	0	0
Equity securities	0	0
Total recurring fair value measurements	0	0
Nonrecurring [Member]
Nonrecurring fair value measurements:
Impaired loans	4,776	4,872
Other real estate owned and repossessed assets	1,208	1,370
Total nonrecurring fair value measurements	5,984	6,242
Nonrecurring [Member] \| Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Nonrecurring fair value measurements:
Impaired loans	0	0
Other real estate owned and repossessed assets	0	0
Total nonrecurring fair value measurements	0	0
Nonrecurring [Member] \| Significant Other Observable Inputs (Level 2) [Member]
Nonrecurring fair value measurements:
Impaired loans	0	0
Other real estate owned and repossessed assets	0	0
Total nonrecurring fair value measurements	0	0
Nonrecurring [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Nonrecurring fair value measurements:
Impaired loans	4,776	4,872
Other real estate owned and repossessed assets	1,208	1,370
Total nonrecurring fair value measurements	$ 5,984	$ 6,242

No definition available.

Name:	lcnb_AvailableForSaleMutualFundsFairValueDisclosure
Namespace Prefix:	lcnb_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in equity securities which are categorized as Available-for-sale.

+ References

No definition available.