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Cover Page - USD ($)
 12 Months Ended
Dec. 31, 2022
Mar. 03, 2023
Jun. 30, 2022
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2022    
Document Transition Report false    
Entity File Number 1-35015    
Entity Registrant Name ACNB CORPORATION    
Entity Incorporation, State or Country Code PA    
Entity Tax Identification Number 23-2233457    
Entity Address, Address Line One 16 Lincoln Square    
Entity Address, City or Town Gettysburg    
Entity Address, State or Province PA    
Entity Address, Postal Zip Code 17325    
City Area Code 717    
Local Phone Number 334-3161    
Title of 12(b) Security Common Stock, $2.50 par value per share    
Trading Symbol ACNB    
Security Exchange Name NASDAQ    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Public Float     $ 248,708,346
Entity Common Stock, Shares Outstanding   8,514,970  
Entity Central Index Key 0000715579    
Current Fiscal Year End Date --12-31    
Document Fiscal Year Focus 2022    
Document Fiscal Period Focus FY    
Amendment Flag false    
ICFR Auditor Attestation Flag true