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ACNB CORPORATION (PARENT COMPANY ONLY) FINANCIAL INFORMATION (Statements of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Condensed Financial Statements, Captions [Line Items]
Gain on sale of securities	$ 0	$ 85
Other income	18,169	15,948
Income tax benefit	(5,645)	(4,972)
Net Income	23,721	21,748
Comprehensive Income	27,085	19,623
Corporation
Condensed Financial Statements, Captions [Line Items]
Dividends from banking subsidiary	6,920	6,261
Gain on sale of securities	0	47
Other income	282	35
Total Revenues	7,202	6,343
Expenses	1,739	1,421
Net income before taxes and equity in undistributed earnings of subsidiaries	5,463	4,922
Income tax benefit	501	547
Net income before equity in undistributed earnings of subsidiaries	5,964	5,469
Equity in undistributed earnings of subsidiaries	17,757	16,279
Net Income	23,721	21,748
Comprehensive Income	$ 27,085	$ 19,623

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Income Loss From Continuing Operations Before Minority Interest And Income Loss From Equity Method Investments

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