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STOCKHOLDERS' EQUITY AND REGULATORY MATTERS (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Jan. 11, 2020
USD ($)
shares
Feb. 24, 2019
Dec. 31, 2021
shares
Dec. 31, 2021
USD ($)
shares
Dec. 31, 2020
USD ($)
shares
Dec. 31, 2018
USD ($)
shares
Feb. 23, 2021
shares
Mar. 08, 2019
shares
Mar. 20, 2018
shares
Feb. 24, 2009
shares
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                    
Shares issued, Dividend Reinvestment and Stock Repurchase Plan (in shares)       23,884 20,015          
Proceeds from issuance of common stock, Dividend Reinvestment and Stock Purchase Plan | $       $ 670 $ 493          
2009 Restricted Stock Plan, number of shares authorized, but not issued (in shares)               174,055    
Treasury Stock, Shares, Acquired     38,970 54,071            
Stock Repurchase Program, Number of Shares Authorized to be Repurchased             261,000      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased, Percentage of Outstanding Shares             0.03      
New Windsor                    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                    
Equity portion of purchase price | $           $ 28,620        
FCBI                    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                    
Equity portion of purchase price | $ $ 57,721                  
Common Stock | New Windsor                    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                    
Shares of common stock issued in acquisition (in shares)           938,360        
Common Stock | FCBI                    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                    
Shares of common stock issued in acquisition (in shares) 1,590,547                  
ACNB Corporation 2009 Restricted Stock Plan                    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                    
2009 Restricted Stock plan, expiration period   10 years                
Awards authorized (in shares)                   200,000
ACNB Corporation 2009 Restricted Stock Plan | Restricted Stock                    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                    
Shares issued under plan since inception (in shares)     25,945 25,945            
ACNB Corporation 2018 Omnibus Stock Incentive Plan                    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                    
Awards authorized (in shares)                 400,000  
ACNB Corporation 2018 Omnibus Stock Incentive Plan | Restricted Stock                    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                    
Shares issued under plan since inception (in shares)     35,587 35,587            
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant     538,468 538,468