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Basis of Presentation and Nature of Operations (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) bank	Jun. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Jan. 01, 2023 USD ($)	Dec. 31, 2022 USD ($)	Mar. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Number of community banking office locations, ACNB | bank			26
Allowance for credit losses on loans	$ 19,148	$ 18,943	$ 19,148	$ 18,943	$ 19,485	$ 17,861	$ 17,861	$ 18,963	$ 19,033
Allowance for unfunded commitments	2,132		2,132			92	92
Unfunded Loan Commitment
Business Acquisition [Line Items]
Allowance for credit losses on loans	2,100		2,100
Reversal of Credit Losses	(121)	0	(397)	0
Financing Receivable Excluding Unfunded Commitments
Business Acquisition [Line Items]
Reversal of Credit Losses	$ 273	$ 0	$ 176	$ 0
Revision of Prior Period, Adjustment
Business Acquisition [Line Items]
Adjustment						3,300
Allowance for credit losses on loans						1,618
Allowance for unfunded commitments						1,643
Impact of CECL adoption
Business Acquisition [Line Items]
Allowance for credit losses on loans						1,600	$ 1,618
Impact of CECL adoption | Financing Receivable Excluding Unfunded Commitments
Business Acquisition [Line Items]
Allowance for credit losses on loans						$ (1,600)
Adams, Cumberland, Franklin and York Counties, Pennsylvania
Business Acquisition [Line Items]
Number of community banking office locations, ACNB | bank			17
Carroll and Frederick Counties, Maryland
Business Acquisition [Line Items]
Number of community banking office locations, ACNB | bank			9

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