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STOCKHOLDERS' EQUITY - Narrative (Details)
$ in Thousands
 12 Months Ended
Feb. 24, 2019
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]            
Treasury stock acquired (in shares)     206,929      
Dividend Reinvestment Plan            
Stockholders' Equity [Line Items]            
Shares issued from the dividend reinvestment plan (in shares)   20,361 20,908      
Proceeds from the dividend reinvestment plan | $   $ 721 $ 713      
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)   99,381        
Non-vested number of shares (in shares)   32,993        
Compensation expense | $   $ 1,000 $ 729      
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    
Treasury stock acquired (in shares)   61,066