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Acquisition of New Windsor Bancorp, Inc. - Purchase Price Consideration in Common Stock (Details) - USD ($)
Jul. 01, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Shares outstanding   7,038,768 7,023,658 6,076,899
Fair Value of Liabilities Assumed        
Goodwill Recorded in Acquisition   $ 19,580,000 $ 19,580,000 $ 6,308,000
NW Bancorp        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Cash consideration (per New Windsor share) (in dollars per share) $ 30.00      
Cash portion of purchase price $ 4,519,995      
ACNB’s share price for purposes of calculation (in dollars per share) $ 30.50     $ 30.50
Equity portion of purchase price $ 28,619,980      
Cost of shares owned by buyer 150,000      
Total consideration paid 33,289,975      
Fair Value of Assets Acquired        
Cash and cash equivalents 10,964,000      
Investment securities 21,624,000      
Loans held for sale 1,463,000      
Loans 263,450,000      
Restricted stock 486,000      
Premises and equipment 8,624,000      
Core deposit intangible asset 2,418,000      
Other assets 10,792,000      
Total assets 319,821,000      
Fair Value of Liabilities Assumed        
Non-interest bearing deposits 80,006,000      
Interest bearing deposits 213,327,000      
Subordinated debt 4,688,000      
Other liabilities 1,782,000      
Total liabilities 299,803,000      
Net Assets Acquired 20,018,000      
Goodwill Recorded in Acquisition $ 13,272,000 $ 13,272,000    
NW Bancorp | Common Stock        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Exchange ratio 1.10      
Total ACNB shares issued 938,360      
NW Bancorp | NW Bancorp        
Business Acquisition, Equity Interests Issued or Issuable [Line Items]        
Shares outstanding 1,003,703      
Shares paid cash consideration 150,555      
Shares paid stock consideration 853,148