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Acquisition of New Windsor Bancorp, Inc. - Purchase Price Consideration in Common Stock (Details) - USD ($) | Jul. 01, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
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Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |
NW Bancorp shares outstanding |  | 7,019,645 |  | 6,064,138 | 6,061,062
Fair Value of Liabilities Assumed |  |  |  |  |
Goodwill Recorded in Merger |  | $ 19,580,000 |  | $ 6,308,000 | $ 6,308,000
NW Bancorp |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |
Cash consideration (per NW Bancorp share) (in dollars per share) | $ 30.00 |  |  |  |
Cash portion of purchase price | $ 4,519,995 |  |  |  |
ACNB’s share price for purposes of calculation (in dollars per share) | $ 30.50 |  | $ 30.50 |  |
Equity portion of purchase price | $ 28,619,980 |  |  |  |
Cost of shares owned by buyer | 150,000 |  |  |  |
Total consideration paid | 33,289,975 |  |  |  |
Fair Value of Assets Acquired |  |  |  |  |
Cash and cash equivalents | 10,964,000 |  |  |  |
Investment securities | 21,624,000 |  |  |  |
Loans held for sale | 1,463,000 |  |  |  |
Loans | 263,450,000 |  |  |  |
Restricted stock | 486,000 |  |  |  |
Premises and equipment | 8,624,000 |  |  |  |
Core deposit intangible asset | 2,418,000 |  |  |  |
Other assets | 10,792,000 |  |  |  |
Total assets | 319,821,000 |  |  |  |
Fair Value of Liabilities Assumed |  |  |  |  |
Non-interest bearing deposits | 80,006,000 |  |  |  |
Interest bearing deposits | 213,327,000 |  |  |  |
Subordinated debt | 4,688,000 |  |  |  |
Other liabilities | 1,782,000 |  |  |  |
Total liabilities | 299,803,000 |  |  |  |
Net Assets Acquired | 20,018,000 |  |  |  |
Goodwill Recorded in Merger | $ 13,272,000 | $ 13,272,000 |  |  |
NW Bancorp | Common Stock |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |
Exchange ratio | 1.10 |  |  |  |
Total ACNB shares issued | 938,360 |  |  |  |
NW Bancorp | NW Bancorp |  |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |  |
NW Bancorp shares outstanding | 1,003,703 |  |  |  |
Shares paid cash consideration | 150,555 |  |  |  |
Shares paid stock consideration | 853,148 |  |  |  |

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