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Basis of Presentation and Nature of Operations (Details)
$ / shares in Units, $ in Thousands
 9 Months Ended
Jul. 19, 2024
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
bank
branch
shares
Dec. 31, 2023
USD ($)
shares
Sep. 30, 2023
USD ($)
Business Acquisition [Line Items]        
Number of community banking office locations, ACNB | bank   27    
Common stock, shares outstanding (in shares) | shares   8,548,625 8,511,453  
Total assets   $ 2,420,914 $ 2,418,847 $ 2,388,522
Loans   1,678,088 1,629,700  
Total deposits   $ 1,791,317 $ 1,861,813  
Traditions Bancorp, Inc.        
Business Acquisition [Line Items]        
Common stock, shares outstanding (in shares) | shares   2,754,062 2,736,544  
Total assets   $ 860,000 $ 840,100  
Loans   683,200 668,800  
Total deposits   $ 740,000 $ 731,100  
Full-service branches | branch   8    
Traditions Bancorp, Inc.        
Business Acquisition [Line Items]        
Number of shares issued per shareholder (in shares) | shares 0.7300      
Value of transaction $ 73,500      
Value of transaction (in dollars per share) | $ / shares $ 26.43      
Adams, Cumberland, Franklin, Lancaster and York Counties, Pennsylvania        
Business Acquisition [Line Items]        
Number of community banking office locations, ACNB | bank   18    
Carroll and Frederick Counties, Maryland        
Business Acquisition [Line Items]        
Number of community banking office locations, ACNB | bank   9