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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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