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LEASE COMMITMENTS (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases [Abstract]      
Rental expense $ 642 $ 492 $ 456
Description of lessee leasing arrangement, operating leases ACNB leases space at several of its owned offices to other unrelated organizations.    
Total rental income $ 60 $ 8 $ 27