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Acquisition of Frederick County Bancorp, Inc. - Narrative (Details) |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 11, 2020 USD ($) bank $ / shares shares | Sep. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Goodwill Recorded in Acquisition |  | $ 42,108,000 | $ 42,108,000 | $ 19,580,000 | $ 19,580,000
Loans receivable, gross amortized cost basis | $ 339,577,000 |  |  |  |
Interest rate fair value discount | 2,600,000 |  |  |  |
Credit fair value discount | 5,300,000 |  |  |  |
Liabilities, Fair Value Adjustment | $ 854,000 |  |  |  |
Merger related expenses |  | $ 0 | $ 6,000,000.0 |  |
Common Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Total ACNB shares issued | shares | 1,590,547 |  |  |  |
Frederick County Bancorp, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of community banking offices acquired | bank | 5 |  |  |  |
Fair value of total assets acquired | $ 443,400,000 |  |  |  |
Fair value of total loans acquired | 329,312,000 |  |  |  |
Fair value of total deposits acquired | 374,100,000 |  |  |  |
Goodwill Recorded in Acquisition | $ 22,528,000 |  |  |  |
ACNB's share price for purposes of calculation (in dollars per share) | $ / shares | $ 36.43 |  |  |  |
Loans receivable, gross amortized cost basis | $ 339,577,000 |  |  |  |
Interest rate fair value discount | (2,632,000) |  |  |  |
Credit fair value discount | $ (5,931,000) |  |  |  |
Frederick County Bancorp, Inc. | Common Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Exchange ratio | shares | 0.9900 |  |  |  |
Total ACNB shares issued | shares | 1,585,597 |  |  |  |
Investment securities available-for-sale | Frederick County Bancorp, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Assets, fair value premium | $ 163,000 |  |  |  |
Time deposits | Frederick County Bancorp, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Assets, fair value premium | $ 255,000 |  |  |  |
Core deposit intangibles |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Amortization period |  |  | 10 years |  |
Core deposit intangibles | Frederick County Bancorp, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Amortization period | 10 years |  |  |  |

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