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Acquisition of New Windsor Bancorp, Inc. - Narrative (Details) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2017 USD ($) bank $ / shares shares | Sep. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Sep. 30, 2017 USD ($) bank | Sep. 30, 2016 USD ($) | Jun. 30, 2017 $ / shares | Dec. 31, 2016 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of retail banking office locations, NWSB | bank |  |  |  | 7 |  |  |
Goodwill |  | $ 19,580,000 | $ 6,308,000 | $ 19,580,000 | $ 6,308,000 |  | $ 6,308,000
Merger related expenses |  | 4,305,000 | $ 0 | $ 4,675,000 | $ 0 |  |
Core deposit intangibles |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Amortization period |  |  |  | 10 years |  |  |
New Windsor |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Number of retail banking office locations, NWSB | bank | 7 |  |  |  |  |  |
Fair Value of total assets acquired | $ 319,821,000 |  |  |  |  |  |
Fair value of total loans acquired | 263,450,000 |  |  |  |  |  |
Fair value of total deposits acquired | 293,300,000 |  |  |  |  |  |
Goodwill | 13,272,000 | $ 13,272,000 |  | $ 13,272,000 |  |  |
Cash portion of purchase price | $ 4,519,995 |  |  |  |  |  |
Percent of post transaction outstanding shares of the Corporation's common stock issued in merger | 13.00% |  |  |  |  |  |
Total consideration paid | $ 33,289,975 |  |  |  |  |  |
ACNB’s share price for purposes of calculation (in dollars per share) | $ / shares | $ 30.50 |  |  |  |  | $ 30.50 |
Loans receivable, gross amortized cost basis | $ 272,646,000 |  |  |  |  |  |
Interest rate fair value discount | 731,000 |  |  |  |  |  |
Credit fair value discount | 4,501,000 |  |  |  |  |  |
New Windsor | Long-term Borrowings |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Liabilities, fair value discount | $ 312,500 |  |  |  |  |  |
New Windsor | Core deposit intangibles |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Amortization period | 10 years |  |  | 10 years |  |  |
New Windsor | Investment Securities Available-for-sale |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Assets, fair value premium (discount) | $ 361,000 |  |  |  |  |  |
New Windsor | Time Deposits |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Assets, fair value premium (discount) | $ (847,500) |  |  |  |  |  |
New Windsor | Common Stock |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Shares of common stock issued in merger (in shares) | shares | 938,360 |  |  |  |  |  |

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