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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
$ / shares in Units, $ in Thousands
 12 Months Ended
Feb. 01, 2025
USD ($)
$ / shares
shares
Feb. 24, 2019
Dec. 31, 2024
USD ($)
branch
bank
shares
Dec. 31, 2023
USD ($)
shares
Dec. 31, 2022
USD ($)
shares
Jan. 01, 2023
USD ($)
Dec. 31, 2021
USD ($)
Mar. 08, 2019
shares
Mar. 20, 2018
shares
Summary of Significant Accounting Policies [Line Items]                  
Number of community banking office locations, ACNB | bank     27            
Post-employment benefit cost for continuing life insurance     $ 165 $ 214 $ 81        
Weighted average shares outstanding, basic (in shares) | shares     8,503,473 8,507,803 8,623,012        
Foreclosed assets held for resale     $ 438 $ 467          
Less: Allowance for credit losses     (17,280) (19,969) $ (17,861) $ (17,861) $ (19,033)    
Financing Receivable, Credit Loss, Expense (Reversal)     (2,763) 844          
Retained earnings     234,624 213,491   245,042      
Allowance for unfunded commitments     1,394 1,719   92      
Total assets     2,394,830 2,418,847 2,525,507        
Gross loans     1,684,146 1,629,700          
Total Deposits     $ 1,792,501 $ 1,861,813          
Common stock, shares outstanding | shares     8,553,785 8,511,453          
Traditions Bancorp, Inc.                  
Summary of Significant Accounting Policies [Line Items]                  
Number Of Community Banking Offices, Traditions | branch     8            
Total assets     $ 870,100 $ 840,100          
Gross loans     674,400 668,800          
Total Deposits     $ 749,300 $ 731,100          
Common stock, shares outstanding | shares     2,788,164 2,736,544          
Traditions Bancorp, Inc. | Subsequent Event                  
Summary of Significant Accounting Policies [Line Items]                  
Business Combination, Equity Interest Issued or Issuable, Number of Shares Per Shareholder | shares 0.7300                
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned Per Share | $ / shares $ 41.10                
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned $ 83,800                
Number of shares issued in acquisition (in shares) | shares 2,035,270                
Unfunded Loan Commitment                  
Summary of Significant Accounting Policies [Line Items]                  
Financing Receivable, Credit Loss, Expense (Reversal)     $ (326) $ (16) 0        
Revision of Prior Period, Adjustment                  
Summary of Significant Accounting Policies [Line Items]                  
Financing Receivable, Allowance for Credit Loss, Total Adjustment           3,300      
Less: Allowance for credit losses           (1,618)      
Retained earnings           2,368      
Allowance for unfunded commitments           1,643      
Cumulative Effect, Period of Adoption, Adjustment                  
Summary of Significant Accounting Policies [Line Items]                  
Less: Allowance for credit losses         (1,618)        
Adams, Cumberland, Franklin, Lancaster and York Counties, Pennsylvania                  
Summary of Significant Accounting Policies [Line Items]                  
Number of community banking office locations, ACNB | bank     18            
Carroll and Frederick Counties, Maryland                  
Summary of Significant Accounting Policies [Line Items]                  
Number of community banking office locations, ACNB | bank     9            
Minimum                  
Summary of Significant Accounting Policies [Line Items]                  
Remaining lease terms     1 year            
Initial term greater than     12 months            
Maximum                  
Summary of Significant Accounting Policies [Line Items]                  
Remaining lease terms     12 years            
Residential Mortgage and Commercial Loans                  
Summary of Significant Accounting Policies [Line Items]                  
Threshold period past due to discontinue accrual interest on financing receivable     90 days            
Consumer                  
Summary of Significant Accounting Policies [Line Items]                  
Threshold period past due for charge off of financing receivable     120 days            
Less: Allowance for credit losses     $ (98) (141) (376) 376 (408)    
Gross loans     9,318 9,954          
Consumer | Revision of Prior Period, Adjustment                  
Summary of Significant Accounting Policies [Line Items]                  
Less: Allowance for credit losses           142      
Consumer | Cumulative Effect, Period of Adoption, Adjustment                  
Summary of Significant Accounting Policies [Line Items]                  
Less: Allowance for credit losses         142        
Commercial real estate                  
Summary of Significant Accounting Policies [Line Items]                  
Less: Allowance for credit losses     (10,578) (12,010) (10,016) 10,016 (10,716)    
Gross loans     $ 969,514 898,709          
Commercial real estate | Revision of Prior Period, Adjustment                  
Summary of Significant Accounting Policies [Line Items]                  
Less: Allowance for credit losses           (1,106)      
Commercial real estate | Cumulative Effect, Period of Adoption, Adjustment                  
Summary of Significant Accounting Policies [Line Items]                  
Less: Allowance for credit losses         (1,106)        
Commercial real estate | Maximum                  
Summary of Significant Accounting Policies [Line Items]                  
Financing receivable term     20 years            
Loan-to-value ratio (no greater than)     80.00%            
Residential Mortgage                  
Summary of Significant Accounting Policies [Line Items]                  
Loan-to-value ratio that requires private mortgage insurance (in excess of)     80.00%            
Residential Mortgage | Maximum                  
Summary of Significant Accounting Policies [Line Items]                  
Financing receivable term     30 years            
Loan-to-value ratio (no greater than)     80.00%            
Home equity lines of credit                  
Summary of Significant Accounting Policies [Line Items]                  
Less: Allowance for credit losses     $ (294) (397) (347) 347 $ (501)    
Gross loans     $ 85,685 $ 90,163          
Home equity lines of credit | Revision of Prior Period, Adjustment                  
Summary of Significant Accounting Policies [Line Items]                  
Less: Allowance for credit losses           $ (17)      
Home equity lines of credit | Cumulative Effect, Period of Adoption, Adjustment                  
Summary of Significant Accounting Policies [Line Items]                  
Less: Allowance for credit losses         $ (17)        
Home equity lines of credit | Maximum                  
Summary of Significant Accounting Policies [Line Items]                  
Financing receivable term     20 years            
Loan-to-value ratio (no greater than)     90.00%            
Buildings                  
Summary of Significant Accounting Policies [Line Items]                  
Useful life     40 years            
Building Remodels and Additions                  
Summary of Significant Accounting Policies [Line Items]                  
Useful life     15 years            
Furniture and equipment | Minimum                  
Summary of Significant Accounting Policies [Line Items]                  
Useful life     3 years            
Furniture and equipment | Maximum                  
Summary of Significant Accounting Policies [Line Items]                  
Useful life     15 years            
Core Deposits                  
Summary of Significant Accounting Policies [Line Items]                  
Intangible asset amortization life     10 years            
Customer Lists | Minimum                  
Summary of Significant Accounting Policies [Line Items]                  
Intangible asset amortization life     8 years            
Customer Lists | Maximum                  
Summary of Significant Accounting Policies [Line Items]                  
Intangible asset amortization life     15 years            
ACNB Corporation 2009 Restricted Stock Plan                  
Summary of Significant Accounting Policies [Line Items]                  
2009 Restricted Stock plan, expiration period   10 years              
2009 Restricted Stock Plan, number of shares authorized, but not issued (in shares) | shares               174,055  
ACNB Corporation 2018 Omnibus Stock Incentive Plan | Restricted Stock                  
Summary of Significant Accounting Policies [Line Items]                  
Shares issued under plan since inception (in shares) | shares     138,019            
Non-vested number of shares (in shares) | shares     38,438            
Awards authorized (in shares) | shares                 400,000