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Earnings Per Share and Restricted Stock (Details) - USD ($)
$ in Thousands
3 Months Ended
Feb. 24, 2019
Mar. 31, 2022
Mar. 31, 2021
Mar. 08, 2019
Mar. 20, 2018
Earnings Per Share [Abstract]          
Weighted average shares of common stock outstanding (in shares)   8,684,152 8,710,393    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Weighted average shares of common stock outstanding (in shares)   8,684,152 8,710,393    
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]          
Compensation expense   $ 243 $ 28    
ACNB Corporation 2009 Restricted Stock Plan          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
2009 Restricted Stock Plan, expiration period 10 years        
ACNB Corporation 2009 Restricted Stock Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued under plan (in shares)   25,945      
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
ACNB Corporation 2018 Omnibus Stock Incentive Plan | Restricted Stock          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares issued under plan (in shares)   57,822      
Shares fully vested (in shares)   29,432      
Shares vested during the quarter (in shares)   13,567      
Non-vested number of shares (in shares)   14,823      
Vesting period (in years)   1 year