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Earnings Per Share and Restricted Stock (Details) - USD ($)
3 Months Ended
Feb. 24, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 20, 2018
Earnings Per Share [Abstract]        
Weighted average shares of common stock outstanding (in shares)   7,046,671 7,025,593  
Share-based Compensation Arrangement by Share-based Payment Award [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    
Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares issued under plan (in shares)   25,945    
Shares fully vested (in shares)   19,485    
Shares vested during the quarter (in shares)   4,240    
Shares expected to vest over next year (in shares)   2,220    
Compensation expense   $ 126,000 $ 186,000  
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