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Acquisition of Frederick County Bancorp, Inc. - Purchase Price Consideration in Common Stock (Details) - USD ($) | Jan. 11, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | --- | ---
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Common stock, shares outstanding |  | 8,715,020 | 8,709,393 | 8,669,906
Fair Value of Liabilities Assumed |  |  |  |
Goodwill Recorded in Acquisition |  | $ 42,108,000 | $ 42,108,000 | $ 41,700,000
Common Stock |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Total ACNB shares issued | 1,590,547 |  |  |
Frederick County Bancorp, Inc. |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Cash consideration (per FCBI share) (in dollars per share) | $ 36.43 |  |  |
Cash portion of purchase price (cash payout of stock options and cash in lieu of fractional shares) | $ 100,798 |  |  |
ACNB's share price for purposes of calculation (in dollars per share) | $ 36.34 |  |  |
Equity portion of purchase price | $ 57,620,595 |  |  |
Cost of shares owned by buyer | 187,200 |  |  |
Total consideration paid | 57,908,593 |  |  |
Fair Value of Assets Acquired |  |  |  |
Cash and cash equivalents | 35,262,000 |  |  |
Investment securities | 22,167,000 |  |  |
Loans held for sale | 4,050,000 |  |  |
Loans | 329,312,000 |  |  |
Restricted stock | 1,141,000 |  |  |
Premises and equipment | 10,959,000 |  |  |
Core deposit intangible asset | 3,560,000 |  |  |
Other assets | 14,446,000 |  |  |
Total assets | 420,897,000 |  |  |
Fair Value of Liabilities Assumed |  |  |  |
Non-interest bearing deposits | 103,492,000 |  |  |
Interest bearing deposits | 270,566,000 |  |  |
Subordinated debt | 6,000,000 |  |  |
Long term borrowings | 3,450,000 |  |  |
Other liabilities | 2,008,000 |  |  |
Total liabilities | 385,516,000 |  |  |
Net Assets Acquired | 35,381,000 |  |  |
Goodwill Recorded in Acquisition | $ 22,528,000 |  |  |
Frederick County Bancorp, Inc. | Common Stock |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Exchange ratio | 0.9900 |  |  |
Total ACNB shares issued | 1,585,597 |  |  |
Frederick County Bancorp, Inc. | Frederick County Bancorp, Inc. |  |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |  |
Common stock, shares outstanding | 1,601,764 |  |  |
Shares paid in cash for fractional shares | 150.88 |  |  |
Shares paid stock consideration | 1,601,613 |  |  |

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