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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Feb. 28, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Jan. 11, 2020 | Jul. 01, 2017 | Jan. 05, 2005
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill | $ 44,184 |  | $ 42,108 | $ 42,108 |  |  |
ACNB Insurance Services, Inc. |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 6,308
New Windsor |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  | $ 13,272 |
Frederick County Bancorp, Inc. |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  | $ 22,528 |  |
Hockley & O'Donnell Insurance Agency, LLC |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Goodwill |  | $ 2,077 |  |  |  |  |
Core Deposit Intangibles |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Amortization period | 10 years |  |  |  |  |  |
Core Deposit Intangibles | New Windsor |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount of intangible asset | $ 2,418 |  |  |  |  | $ 2,418 |
Accumulated amortization of intangible asset | 1,692 |  |  |  |  |  |
Core Deposit Intangibles | Frederick County Bancorp, Inc. |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount of intangible asset | 3,560 |  |  |  | $ 3,560 |  |
Accumulated amortization of intangible asset | 1,359 |  |  |  |  |  |
Customer Lists | ACNB Insurance Services, Inc. |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount of intangible asset | 16,151 |  |  |  |  |  |
Accumulated amortization of intangible asset | $ 7,562 |  |  |  |  |  |
Customer Lists | Minimum |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Amortization period | 8 years |  |  |  |  |  |
Customer Lists | Maximum |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Amortization period | 15 years |  |  |  |  |  |
Covenant Not To Compete | Hockley & O'Donnell Insurance Agency, LLC |  |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |  |
Gross carrying amount of intangible asset |  | $ 5,835 |  |  |  |  |

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