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NEW WINDSOR ACQUISITION (Purchase Price Consideration in Common Stock) (Details) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jul. 01, 2017 | Dec. 31, 2017 | Dec. 31, 2018 | Jun. 30, 2017
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
New Windsor shares of common stock outstanding |  | 7,023,658 | 7,046,020 |
Fair Value of Liabilities Assumed |  |  |  |
Goodwill Recorded in Acquisition |  | $ 19,580,000 | $ 19,580,000 |
New Windsor |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Cash consideration (per New Windsor share) | $ 30.00 |  |  |
Cash portion of purchase price | $ 4,519,995 |  |  |
ACNB’s share price of common stock for purposes of calculation | $ 30.50 |  |  | $ 30.50
Equity portion of purchase price | $ 28,619,980 | $ 28,620,000 |  |
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 Acquisition | $ 13,272,000 |  | $ 13,300,000 |
New Windsor | Common Stock |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Exchange ratio | 1.10 |  |  |
Total ACNB shares of common stock issued | 938,360 | 938,360 |  |
NW Bancorp | New Windsor |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
New Windsor shares of common stock outstanding | 1,003,703 |  |  |
Shares paid cash consideration | 150,555 |  |  |
Shares of common stock paid stock consideration | 853,148 |  |  |

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