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RESTRICTIONS ON CASH AND DUE FROM BANKS (Narrative) (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Restricted Cash and Investments [Abstract] |  |
Compensating Balance, Amount | $ 1,203 | $ 933
Average Compensating Balance Amount | $ 1,337 | $ 1,512

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Namespace Prefix: | acnb_
Data Type: | xbrli:monetaryItemType
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Period Type: | instant

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- Definition The amount of a specific compensating balance arrangement that is maintained under an agreement for a bank loan or future credit availability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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