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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details)
 12 Months Ended
Jul. 01, 2017
USD ($)
bank
Dec. 31, 2018
USD ($)
shares
Dec. 31, 2017
USD ($)
shares
Summary of Significant Accounting Policies [Line Items]      
Number of community banking office locations, ACNB   22  
Number of community banking office locations, NWSB   7  
Assets Held-in-trust   $ 342,000,000 $ 327,000,000
Total Loans Receivable   $ 1,302,465,000 1,244,170,000
Number of minimum months for corporation to order updated valuation   18 months  
Post-employment benefit cost for continuing life insurance   $ 95,000 96,000
Foreclosed assets held for resale   $ 155,000 $ 436,000
Weighted average number of shares outstanding, basic | shares   7,035,818 6,543,756
Restricted Stock      
Summary of Significant Accounting Policies [Line Items]      
Cumulative amount of shares issued under the plan (in shares) | shares   26,045  
Compensation expense   $ 186,000 $ 133,000
Shares vested | shares   19,485  
Shares expected to vest over next two years | shares   6,560  
Weighted average remaining contractual term   2 years  
Credit Concentration Risk      
Summary of Significant Accounting Policies [Line Items]      
Total Loans Receivable   $ 287,030,000  
Concentration Risk, Percentage   22.00%  
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   $ 14,400,000 16,337,000
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   $ 548,923,000 $ 492,759,000
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  
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   $ 92,000  
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]      
Number of community banking office locations, NWSB | bank 7    
Interest rate fair value discount $ 731,000    
Credit fair value discount $ 4,501,000    
Core Deposits      
Summary of Significant Accounting Policies [Line Items]      
Intangible asset amortization life   10 years  
Core Deposits | New Windsor      
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  
Pro Forma | Accounting Standards Update 2016-02      
Summary of Significant Accounting Policies [Line Items]      
Right-of-use asset   $ 4,000,000  
Lease liability   $ 4,000,000