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ACNB CORPORATION (PARENT COMPANY ONLY) FINANCIAL INFORMATION (Statements of Income) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Condensed Financial Statements, Captions [Line Items]                      
Gain on sale of securities $ 0 $ 0 $ 0 $ 0 $ 26,000 $ 0 $ 0 $ 0 $ 0 $ 26,000 $ 261,000
Other income                 14,149,000 13,208,000 12,406,000
Income tax benefit                 (6,634,000) (3,768,000) (3,761,000)
Net Income $ 2,517,000 $ 1,912,000 $ 2,722,000 $ 2,637,000 $ 2,572,000 $ 2,768,000 $ 2,982,000 $ 2,547,000 9,788,000 10,869,000 11,017,000
Comprehensive Income                 9,903,000 9,571,000 9,014,000
Parent Company                      
Condensed Financial Statements, Captions [Line Items]                      
Dividends from banking subsidiary                 5,233,000 4,840,000 4,820,000
Gain on sale of securities                 0 26,000 0
Other income                 31,000 35,000 190,000
Total Revenues                 5,264,000 4,901,000 5,010,000
Expenses                 1,572,000 854,000 431,000
Net income before taxes and equity in undistributed earnings of subsidiaries                 3,692,000 4,047,000 4,579,000
Income tax benefit                 507,000 490,000 381,000
Net income before equity in undistributed earnings of subsidiaries                 4,199,000 4,537,000 4,960,000
Equity in undistributed earnings of subsidiaries                 5,589,000 6,332,000 6,057,000
Net Income                 9,788,000 10,869,000 11,017,000
Comprehensive Income                 $ 9,903,000 $ 9,571,000 $ 9,014,000