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ACNB CORPORATION (PARENT COMPANY ONLY) FINANCIAL INFORMATION (Statements of Income) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Condensed Financial Statements, Captions [Line Items]
Gain on sale of securities	$ 85	$ 0
Other income	15,948	14,149
Income tax benefit	(4,972)	(6,634)
Net Income	21,748	9,788
Comprehensive Income	19,623	9,903
Parent Company
Condensed Financial Statements, Captions [Line Items]
Dividends from banking subsidiary	6,261	5,233
Gain on sale of securities	47	0
Other income	35	31
Total Revenues	6,343	5,264
Expenses	1,421	1,572
Net income before taxes and equity in undistributed earnings of subsidiaries	4,922	3,692
Income tax benefit	547	507
Net income before equity in undistributed earnings of subsidiaries	5,469	4,199
Equity in undistributed earnings of subsidiaries	16,279	5,589
Net Income	21,748	9,788
Comprehensive Income	$ 19,623	$ 9,903

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

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