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Basis of Presentation and Nature of Operations (Details) $ in Thousands			6 Months Ended
	Jan. 11, 2020 bank	Jul. 01, 2017 bank	Jun. 30, 2020 USD ($) bank	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Jan. 01, 2019 USD ($)
Business Acquisition [Line Items]
Number of community banking office locations, ACNB | bank			21
Right of use assets			$ 3,474	$ 3,502	$ 3,711
Lease liabilities			$ 3,453	$ 3,502	$ 3,711
Accounting Standards Update 2016-02
Business Acquisition [Line Items]
Right of use assets						$ 4,000
Lease liabilities						$ 4,000
New Windsor
Business Acquisition [Line Items]
Number of community banking offices acquired | bank		7
Frederick County Bancorp, Inc.
Business Acquisition [Line Items]
Number of community banking offices acquired | bank	5

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Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
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-Name Accounting Standards Codification
-Topic 842
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-Section 45
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