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ACQUISITION (Narrative) (Details) |  | 12 Months Ended
--- | --- | ---
Jan. 11, 2020 USD ($) director $ / shares shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |
Business Acquisition, Pro Forma Assets |  | $ 1,720,253,000 | $ 1,647,724,000
Business Acquisition, Pro Forma Deposits |  | 1,412,260,000 | 1,348,092,000
Business Acquisition, Pro Forma Loans |  | 1,258,766,000 | 1,288,501,000
Merger related expenses |  | $ 769,000 | $ 0
Subsequent Event | FCBI |  |  |
Business Acquisition [Line Items] |  |  |
ACNB’s share price for purposes of calculation (in dollars per share) | $ / shares | $ 36.43 |  |
Business Combination, Number of Directors Joining Board of Directors | director | 1 |  |
Business Acquisition, Pro Forma Assets | $ 2,200,000,000 |  |
Business Acquisition, Pro Forma Deposits | 1,800,000,000 |  |
Business Acquisition, Pro Forma Loans | $ 1,600,000,000 |  |
Subsequent Event | Common Stock | FCBI |  |  |
Business Acquisition [Line Items] |  |  |
Exchange ratio | shares | 0.9900 |  |
Shares of common stock issued in acquisition (in shares) | shares | 1,590,547 |  |

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