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Basis of Presentation and Nature of Operations (Details) | 9 Months Ended
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Sep. 30, 2022 bank
Business Acquisition [Line Items] |
Number of community banking office locations, ACNB | 29
Adams, Cumberland, Franklin and York Counties, Pennsylvania |
Business Acquisition [Line Items] |
Number of community banking office locations, ACNB | 18
Carroll and Frederick Counties, Maryland |
Business Acquisition [Line Items] |
Number of community banking office locations, ACNB | 11

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementGeographicalAxis=acnb_CarrollAndFrederickCountiesMarylandMember
Namespace Prefix: |
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Balance Type: |
Period Type: |