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Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands		9 Months Ended
	Feb. 28, 2022	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021	Jan. 11, 2020	Jul. 01, 2017	Jan. 05, 2005
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 44,185	$ 42,108	$ 42,108
Payments to Acquire Insurance Book of Business	$ 7,800	$ 7,800	$ 0
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		1,817
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		1,619
Customer Lists | ACNB Insurance Services, Inc.
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount of intangible asset		16,152
Accumulated amortization of intangible asset		$ 7,963
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	$ 5,723
Intangible Assets, Net (Including Goodwill)		$ 587

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