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STOCKHOLDERS' EQUITY AND REGULATORY MATTERS (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 11, 2020
Feb. 24, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Mar. 08, 2019
Mar. 20, 2018
Feb. 24, 2009
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                
Shares issued, Dividend Reinvestment and Stock Repurchase Plan (in shares)     20,015 17,324        
Proceeds from issuance of common stock, Dividend Reinvestment and Stock Purchase Plan     $ 493 $ 501        
2009 Restricted Stock Plan, number of shares authorized, but not issued (in shares)           174,055    
Restricted Stock                
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                
Shares issued under plans (in shares)     19,472 16,115        
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                
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]                
Shares of common stock issued in acquisition (in shares) 1,590,547              
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          
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