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Basis of Presentation and Nature of Operations (Details)	9 Months Ended
	Sep. 30, 2018 bank
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of community banking office locations, ACNB	22
Number of community banking office locations, NWSB	7

X

- Definition

Number of full-service retail bank offices acquired.

+ References

No definition available.

+ Details

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X

- Definition

Number of Full-service Bank Offices attributable to the Parent Company.

+ References

No definition available.

+ Details

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Namespace Prefix:	acnb_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

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