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Earnings Per Share and Restricted Stock (Details) - USD ($) $ in Thousands		3 Months Ended
	Feb. 24, 2019	Mar. 31, 2023	Mar. 31, 2022	Mar. 08, 2019	Mar. 20, 2018	Feb. 24, 2009
Earnings Per Share [Abstract]
Weighted average shares of common stock outstanding, basic (in shares)		8,511,244	8,684,152
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average shares of common stock outstanding, basic (in shares)		8,511,244	8,684,152
Weighted average shares of common stock outstanding, diluted (in shares)		8,522,976	8,684,152
Non-vested number of shares (in shares)		35,500
2009 Restricted Stock Plan, Number of shares authorized, but not issued (in shares)				174,055
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense		$ 495	$ 243
ACNB Corporation 2009 Restricted Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
2009 Restricted Stock Plan, expiration period	10 years
Aggregate shares of common stock under new stock incentive plan (in shares)						200,000
ACNB Corporation 2009 Restricted Stock Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued under plan (in shares)		25,945
ACNB Corporation 2018 Omnibus Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Aggregate shares of common stock under new stock incentive plan (in shares)					400,000
ACNB Corporation 2018 Omnibus Stock Incentive Plan | Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Non-vested number of shares (in shares)		14,623
Shares issued under plan (in shares)		100,596
Shares fully vested (in shares)		42,899
Shares vested during the quarter (in shares)		0
Vesting period (in years)		2 years
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant		473,459

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