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Subsequent Events	9 Months Ended
	Sep. 30, 2025
Subsequent Events [Abstract]
Subsequent Events	Subsequent Event On October 14, 2025 ACNB executed a forward-starting, two year $20.0 million receive-floating/pay-fixed interest rate swap at a rate of 3.20% to begin on October 27, 2025. On October 27, 2025 ACNB executed a three month FHLB borrowing of $20.0 million at a rate of 4.08%. On October 15, 2025 ACNB purchased an additional $8.4 million in bank-owned life insurance policies.

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No definition available.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-Name Accounting Standards Codification
-Publisher FASB
-URI https://asc.fasb.org/855/tableOfContent

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 855
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483399/855-10-50-2

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