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STOCKHOLDERS' EQUITY - Narrative (Details)
$ in Thousands
 12 Months Ended
Feb. 24, 2019
Dec. 31, 2024
USD ($)
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Oct. 18, 2022
shares
Mar. 08, 2019
shares
Mar. 20, 2018
shares
Stockholders' Equity [Line Items]              
Shares issued from the dividend reinvestment plan (in shares)   21,750 20,361 20,908      
Treasury stock acquired (in shares)   6,842 61,066 206,929      
Common stock shares issued | $   $ 832 $ 721 $ 713      
Compensation expense for restricted shares | $   $ 1,263 $ 1,004 $ 729      
Shares purchased under plan (in shares)   67,908          
ACNB Corporation 2018 Omnibus Stock Incentive Plan | Restricted Stock              
Stockholders' Equity [Line Items]              
Awards authorized (in shares)             400,000
Shares issued under plan since inception (in shares)   138,019          
Non-vested number of shares (in shares)   38,438          
ACNB Corporation 2009 Restricted Stock Plan              
Stockholders' Equity [Line Items]              
2009 Restricted Stock plan, expiration period 10 years            
2009 Restricted Stock Plan, number of shares authorized, but not issued (in shares)           174,055  
Stock Repurchase Plan              
Stockholders' Equity [Line Items]              
Authorized (in shares)         255,575    
Percentage of shares authorized         0.03