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Deposits - Composition of Deposits (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Deposits [Abstract] |  |
Noninterest-bearing demand | $ 565,530 | $ 595,049
Interest-bearing checking, savings, and money markets | 1,172,560 | 1,310,796
Certificates of deposit of $250,000 or less | 178,308 | 241,562
Certificates of deposit greater than $250,000 | 34,961 | 51,568
Total Deposits | $ 1,951,359 | $ 2,198,975

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- Definition Certificates Of Deposit, $250,000 Or Less + References No definition available. + Details
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Namespace Prefix: | acnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Certificates Of Deposit, $250,000 Or More + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The aggregate of all deposit liabilities held by the entity, including foreign and domestic, interest and noninterest bearing; may include demand deposits, saving deposits, Negotiable Order of Withdrawal (NOW) and time deposits among others. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
Name: | us-gaap_Deposits
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Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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- Definition Amount of interest bearing deposits with no stated maturity, which may include passbook and statement savings accounts and money-market deposit accounts (MMDAs). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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- Definition Amount of money in noninterest-bearing domestic accounts that entitle the depositor to withdraw funds at any time without prior notice, also known as demand deposits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.12) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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