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Basis of Presentation and Nature of Operations (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2025
USD ($)
bank
shares
Dec. 31, 2024
USD ($)
shares
Mar. 31, 2024
USD ($)
Business Acquisition [Line Items]      
Number of community banking office locations, ACNB | bank 33    
Common stock, shares outstanding (in shares) | shares 10,543,671 8,553,785  
Total assets | $ $ 3,270,041 $ 2,394,830 $ 2,414,288
Loans | $ 2,323,938 1,684,146  
Total deposits | $ $ 2,540,009 $ 1,792,501  
Adams, Cumberland, Franklin, Lancaster and York Counties, Pennsylvania      
Business Acquisition [Line Items]      
Number of community banking office locations, ACNB | bank 24    
Carroll and Frederick Counties, Maryland      
Business Acquisition [Line Items]      
Number of community banking office locations, ACNB | bank 9