XML 119 R105.htm IDEA: XBRL DOCUMENT
v3.20.4

ACQUISITION (Fair Value Adjustments) (Details) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Jan. 11, 2020 | Dec. 31, 2020
Business Acquisition [Line Items] |  |
Gross amortized cost basis at January 11, 2020 | $ 339,577 |
Interest rate fair value adjustment on pools of homogeneous loans | 2,600 | $ (2,600)
Credit fair value adjustment on pools of homogeneous loans | 5,300 | $ (5,900)
Frederick County Bancorp, Inc. |  |
Business Acquisition [Line Items] |  |
Gross amortized cost basis at January 11, 2020 | 339,577 |
Interest rate fair value adjustment on pools of homogeneous loans | (2,632) |
Credit fair value adjustment on pools of homogeneous loans | (5,931) |
Fair value of acquired loans at January 11, 2020 | 329,312 |
Frederick County Bancorp, Inc. | Purchased credit impaired loans |  |
Business Acquisition [Line Items] |  |
Credit fair value adjustment on pools of homogeneous loans | $ (1,702) |

X
- Definition Business Combination, Acquired Receivables, Credit Fair Value Adjustments + References No definition available. + Details
Name: | acnb_BusinessCombinationAcquiredReceivablesCreditFairValueAdjustments
Namespace Prefix: | acnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Business Combination, Acquired Receivables, Interest Rate Fair Value Adjustments + References No definition available. + Details
Name: | acnb_BusinessCombinationAcquiredReceivablesInterestRateFairValueAdjustments
Namespace Prefix: | acnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_BusinessAcquisitionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationAcquiredReceivablesFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition For receivables acquired in a business combination, excluding certain loans and debt securities acquired in a transfer (as defined), this element represents the gross contractual amounts receivable, by major class of receivable, such as loans, direct finance leases (as defined), and any other class of receivables. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121647850&loc=d3e4845-128472 + Details
Name: | us-gaap_BusinessCombinationAcquiredReceivablesGrossContractualAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_BusinessAcquisitionAxis=acnb_FrederickCountyBancorpInc.Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditLossStatusAxis=us-gaap_FinancialAssetAcquiredWithCreditDeteriorationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |