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Earnings Per Share and Restricted Stock (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 23 Months Ended
Feb. 24, 2019
Sep. 30, 2024
USD ($)
$ / shares
shares
Mar. 31, 2024
shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Mar. 31, 2023
shares
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
$ / shares
shares
Sep. 30, 2024
shares
Oct. 18, 2022
shares
Mar. 08, 2019
shares
Mar. 20, 2018
shares
Earnings Per Share [Abstract]                      
Weighted average shares of common stock outstanding, basic (in shares)   8,507,140   8,517,917   8,500,860 8,518,006        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Weighted average shares of common stock outstanding, basic (in shares)   8,507,140   8,517,917   8,500,860 8,518,006        
Dilutive effect of unvested shares (in shares)   38,438   33,628   31,831 26,726        
Weighted average shares of common stock outstanding, diluted (in shares)   8,545,578   8,551,545   8,532,691 8,544,732        
Basic earnings (in dollars per share) | $ / shares   $ 0.85   $ 1.06   $ 2.97 $ 3.24        
Diluted earnings (in dollars per share) | $ / shares   $ 0.84   $ 1.06   $ 2.96 $ 3.23        
2009 Restricted Stock Plan, Number of shares authorized, but not issued (in shares)                   174,055  
Common stock shares repurchased (in shares)   2,642 4,200 46,378 850            
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 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]                      
Non-vested number of shares (in shares)   38,438       38,438   38,438      
Shares issued under plan (in shares)   138,019       138,019   138,019      
Compensation expense | $   $ 244   $ 265   $ 1,000 $ 1,000        
Stock Repurchase Plan                      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                      
Stock Repurchase Program, Number of Shares Authorized to be Repurchased                 255,575    
Stock Repurchase Program, Number of Shares Authorized to be Repurchased, Percentage of Outstanding Shares                 0.03    
Common stock shares repurchased (in shares)   2,642       6,842   67,908