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Note 2 - Business Combinations (Details Textual)			3 Months Ended		9 Months Ended
	Apr. 12, 2024 USD ($) $ / shares shares	Nov. 01, 2023 USD ($) $ / shares shares	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)
Business Combination, Acquisition Related Costs			$ 281,000	$ 302,000	$ 3,376,000	$ 742,000
Cincinnati Bancorp, Inc. [Member]
Business Acquisition, Stock To Be Received, Shares (in shares) | shares		0.9274
Business Acquisition, Cash For Stock Options (in dollars per share) | $ / shares		$ 17.21
Business Acquisition, Limitation of Stock, Percent		80.00%
Business Acquisition, Limitation of Cash, Percent		20.00%
Business Combination, Acquired Receivable, Fair Value		$ 231,900,000
Business Combination, Acquired Receivables, Gross Contractual Amount		258,600,000
Business Combination, Acquired Receivables, Estimated Uncollectible		$ 1,722,000,000
Business Combination, Acquisition Related Costs			10,000	290,000	332,000	705,000
Cincinnati Bancorp, Inc. [Member] | Core Deposits [Member]
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)		10 years
Cincinnati Bancorp, Inc. [Member] | Cincinnati, Ohio [Member]
Business Combination, Number of Operating Branches		4
Cincinnati Bancorp, Inc. [Member] | Florence, Kentucky [Member]
Business Combination, Number of Operating Branches		1
Eagle Financial Bancorp, Inc. [Member]
Business Acquisition, Stock To Be Received, Shares (in shares) | shares	1.1401
Business Acquisition, Cash For Stock Options (in dollars per share) | $ / shares	$ 19.1
Business Combination, Acquired Receivable, Fair Value	$ 101,700,000
Business Combination, Acquired Receivables, Gross Contractual Amount	$ 112,500,000
Business Combination, Acquired Receivables, Estimated Uncollectible			763,000		763,000
Business Combination, Acquisition Related Costs			$ 271,000	$ 12,000	$ 3,044,000	$ 37,000
Eagle Financial Bancorp, Inc. [Member] | Minimum [Member]
Business Acquisition, Limitation of Stock, Percent	60.00%
Eagle Financial Bancorp, Inc. [Member] | Maximum [Member]
Business Acquisition, Limitation of Stock, Percent	70.00%
Eagle Financial Bancorp, Inc. [Member] | Core Deposits [Member]
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)	9 years
Eagle Financial Bancorp, Inc. [Member] | Cincinnati, Ohio [Member]
Business Combination, Number of Operating Branches	3

X

- Definition

The amount per share the company will payout for the stock options as a result of the merger.

+ References

No definition available.

+ Details

Name:	lcnb_BusinessAcquisitionCashForStockOptions
Namespace Prefix:	lcnb_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The limitation percent related to the cash payout for employee shares.

+ References

No definition available.

+ Details

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Namespace Prefix:	lcnb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The percent of the stock limitation for the merger.

+ References

No definition available.

+ Details

Name:	lcnb_BusinessAcquisitionLimitationOfStockPercent
Namespace Prefix:	lcnb_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares offered by the company as a result of the merger.

+ References

No definition available.

+ Details

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Namespace Prefix:	lcnb_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of operating branches owned by the company.

+ References

No definition available.

+ Details

Name:	lcnb_BusinessCombinationNumberOfOperatingBranches
Namespace Prefix:	lcnb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482665/350-30-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 985
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481283/985-20-50-2

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the best estimate at the acquisition date of the contractual cash flows not expected to be collected, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(3)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 805
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)(2)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479907/805-20-50-1

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
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X

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479405/805-10-25-23

+ Details

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X

- Details

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Namespace Prefix:
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- Details

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X

- Details

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X

- Details

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Namespace Prefix:
Data Type:	na
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X

- Details

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- Details

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