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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
 9 Months Ended 12 Months Ended
Jan. 11, 2020
USD ($)
director
loan_offices
bank
$ / shares
shares
Feb. 24, 2019
Jul. 01, 2017
USD ($)
Sep. 30, 2019
Dec. 31, 2019
USD ($)
bank
shares
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
shares
Mar. 08, 2019
shares
Mar. 20, 2018
shares
Feb. 24, 2009
shares
Summary of Significant Accounting Policies [Line Items]                    
Number of community banking office locations, ACNB | bank         22          
Number of community banking office locations, NWSB | bank         7          
Business Acquisition, Pro Forma Assets         $ 1,720,253,000 $ 1,647,724,000        
Business Acquisition, Pro Forma Deposits         1,412,260,000 1,348,092,000        
Business Acquisition, Pro Forma Loans         1,258,766,000 1,288,501,000        
Assets Held-in-trust         389,000,000 342,000,000        
Total Loans Receivable         $ 1,272,601,000 1,302,465,000        
Number of minimum months for corporation to order updated valuation         18 months          
Post-employment benefit cost for continuing life insurance         $ 161,000 95,000        
Foreclosed assets held for resale         $ 364,000 $ 155,000        
2009 Restricted Stock Plan, number of shares authorized, but not issued (in shares) | shares               174,055    
Weighted average number of shares outstanding, basic | shares         7,061,524 7,035,818        
Right of use assets         $ 3,502,000 $ 0        
Lease liabilities         3,502,000 0        
Restricted Stock                    
Summary of Significant Accounting Policies [Line Items]                    
Compensation expense         322,000 186,000        
Credit Concentration Risk                    
Summary of Significant Accounting Policies [Line Items]                    
Total Loans Receivable         $ 297,654,000          
Concentration Risk, Percentage         23.40%          
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]                    
Total Loans Receivable         $ 13,438,000 14,400,000        
Threshold period past due for charge off of financing receivable         120 days          
Commercial real estate                    
Summary of Significant Accounting Policies [Line Items]                    
Total Loans Receivable         $ 567,048,000 $ 548,923,000        
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%          
Foreclosed assets held for resale         $ 83,000          
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 Line 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          
Bank Equipment | Minimum                    
Summary of Significant Accounting Policies [Line Items]                    
Useful life         5 years          
Bank Equipment | Maximum                    
Summary of Significant Accounting Policies [Line Items]                    
Useful life         15 years          
New Windsor                    
Summary of Significant Accounting Policies [Line Items]                    
Interest rate fair value discount     $ 731,000              
Credit fair value discount     $ 4,500,000              
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          
Accounting Standards Update 2016-02                    
Summary of Significant Accounting Policies [Line Items]                    
Right of use assets         $ 4,000,000          
Lease liabilities         $ 4,000,000          
ACNB Corporation 2009 Restricted Stock Plan                    
Summary of Significant Accounting Policies [Line Items]                    
2009 Restricted Stock plan, expiration period   10 years                
Awards authorized (in shares) | shares                   200,000
ACNB Corporation 2009 Restricted Stock Plan | Restricted Stock                    
Summary of Significant Accounting Policies [Line Items]                    
Shares issued under plan since inception (in shares) | shares         25,945          
Shares fully vested (in shares) | shares         23,730          
Non-vested number of shares (in shares) | shares         2,215          
ACNB Corporation 2018 Omnibus Stock Incentive Plan                    
Summary of Significant Accounting Policies [Line Items]                    
Awards authorized (in shares) | shares                 400,000  
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         16,115          
Shares fully vested (in shares) | shares         5,372          
Non-vested number of shares (in shares) | shares         10,743          
Vesting period (in years)       2 years            
Subsequent Event                    
Summary of Significant Accounting Policies [Line Items]                    
Number of loan production offices | loan_offices 3                  
Subsequent Event | FCBI                    
Summary of Significant Accounting Policies [Line Items]                    
ACNB’s share price of common stock for purposes of calculation | $ / shares $ 36.43                  
Business Combination, Number of Directors Joining Board of Directors | director 1                  
Business Acquisition, Pro Forma Assets $ 2,200,000,000                  
Business Acquisition, Pro Forma Deposits 1,800,000,000                  
Business Acquisition, Pro Forma Loans $ 1,600,000,000                  
Business Acquisition, Pro Forma Number of Community Banking Offices | bank 34                  
Common Stock | New Windsor                    
Summary of Significant Accounting Policies [Line Items]                    
Total ACNB shares of common stock issued | shares             938,360      
Common Stock | Subsequent Event | FCBI                    
Summary of Significant Accounting Policies [Line Items]                    
Exchange ratio | shares 0.9900                  
Total ACNB shares of common stock issued | shares 1,590,547                  
Real Estate                    
Summary of Significant Accounting Policies [Line Items]                    
Threshold period past due for Corporation to order updated valuation on financing receivable         90 days          
Number of previous months with no updated valuation completed for Corporation to update validation         12 months          
Number of maximum days of loan being classified as impaired for Corporation to order third party valuation         30 days