XML 63 R52.htm IDEA: XBRL DOCUMENT
v3.21.1

Loans - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) Contract loan application | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Period for order of valuations (at least) | 18 months |  |
Troubled debt restructured loans, balance | $ 3,764,000 | $ 3,933,000 |
Number of loans which has periodic late payments | Contract | 1 |  |
Financing Receivable, Modifications, Subsequent Default, Number of Contracts with Active Forbearance Agreements | 0 |  |
Consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings are in process | $ 506,000 |  | $ 391,000
Recognized loan fee income | $ 17,798,000 | 19,035,000 |
Residential mortgage and commercial loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Threshold period past due to discontinue accrual interest on financing receivable | 90 days |  |
Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Threshold period past due for write-off of financing receivable (no later than) | 120 days |  |
Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Period of financing receivable, updated valuation on real estate secured loans (number of days past due) | 90 days |  |
Number of previous months with no updated valuation completed for corporation to update valuation | 12 months |  |
Impaired financing receivable, valuation on real estate collateralized loans (number of days after the loan is classified as impaired) | 30 days |  |
CARES Act |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Troubled debt restructured loans, balance | $ 23,720,360 |  |
Number of loans with temporary modifications | loan | 30 |  |
Number of applications | application | 2,049 |  |
Total amount under PPP (up to) | $ 213,977,091 |  |
Projected fee income | 8,700,000 |  |
Recognized loan fee income | 953,000 |  | $ 2,800,000
CARES Act | Consumer |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Troubled debt restructured loans, balance | $ 157,609 |  |
Number of loans with temporary modifications | loan | 2 |  |
Maximum | Commercial real estate |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable term | 20 years |  |
Loan-to-value ratio (no greater than) | 80.00% |  |
Maximum | Residential mortgage |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable term | 30 years |  |
Loan-to-value ratio (no greater than) | 80.00% |  |
Loan-to-value ratio that requires private mortgage insurance (in excess of) | 80.00% |  |
Maximum | Home equity lines of credit |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Financing receivable term | 20 years |  |
Loan-to-value ratio (no greater than) | 90.00% |  |
Nonaccrual |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Troubled debt restructured loans, balance | $ 111,000 | 175,000 |
Accrual |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Troubled debt restructured loans, balance | $ 3,653,000 | $ 3,758,000 |

X
- Definition Financing Receivable, Loan to Value Ratio of Appraised Value of Property + References No definition available. + Details
Name: | acnb_FinancingReceivableLoantoValueRatioofAppraisedValueofProperty
Namespace Prefix: | acnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Loan to Value Ratio of Appraised Value of Property, Required to have Private Mortgage Insurance if in excess of this percentage. + References No definition available. + Details
Name: | acnb_FinancingReceivableLoantoValueRatioofAppraisedValueofPropertyRequiredtohavePrivateMortgageInsurance
Namespace Prefix: | acnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Modifications, Subsequent Default, Number of Contracts with Active Forbearance Agreements + References No definition available. + Details
Name: | acnb_FinancingReceivableModificationsSubsequentDefaultNumberofContractswithActiveForbearanceAgreements
Namespace Prefix: | acnb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable Modifications Subsequent Default Periodic Late Payments + References No definition available. + Details
Name: | acnb_FinancingReceivableModificationsSubsequentDefaultPeriodicLatePayments
Namespace Prefix: | acnb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Number of Applications Awarded + References No definition available. + Details
Name: | acnb_FinancingReceivableNumberofApplicationsAwarded
Namespace Prefix: | acnb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Financing Receivable, Projected Fee Income + References No definition available. + Details
Name: | acnb_FinancingReceivableProjectedFeeIncome
Namespace Prefix: | acnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Financing Receivable, Term + References No definition available. + Details
Name: | acnb_FinancingReceivableTerm
Namespace Prefix: | acnb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Financing Receivable, Total Amount Awarded + References No definition available. + Details
Name: | acnb_FinancingReceivableTotalAmountAwarded
Namespace Prefix: | acnb_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of Maximum Days of Loan Being Classified as Impaired for Corporation to Order Third Party Valuation + References No definition available. + Details
Name: | acnb_NumberofMaximumDaysofLoanBeingClassifiedasImpairedforCorporationtoOrderThirdPartyValuation
Namespace Prefix: | acnb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Minimum Months for Corporation to Order Updated Valuation + References No definition available. + Details
Name: | acnb_NumberofMinimumMonthsforCorporationtoOrderUpdatedValuation
Namespace Prefix: | acnb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of Previous Months with No Updated Valuation Completed for Corporation to Update Valuation + References No definition available. + Details
Name: | acnb_NumberofPreviousMonthswithNoUpdatedValuationCompletedforCorporationtoUpdateValuation
Namespace Prefix: | acnb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Threshold Period Past Due for Corporation to Order Updated Valuation on Financing Receivable + References No definition available. + Details
Name: | acnb_ThresholdPeriodPastDueforCorporationtoOrderUpdatedValuationonFinancingReceivable
Namespace Prefix: | acnb_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Threshold Period Past Due to Discontinue Accrual Interest on Financing Receivable + References No definition available. + Details
Name: | acnb_ThresholdPeriodPastDuetoDiscontinueAccrualInterestonFinancingReceivable
Namespace Prefix: | acnb_
Data Type: | xbrli:durationItemType
Balance Type: | na
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_AccountsNotesAndLoansReceivableLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of financing receivable modified as troubled debt restructuring. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 40 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121585226&loc=d3e18845-111554 + Details
Name: | us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Threshold period for when financing receivable is considered past due to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919253-210447 + Details
Name: | us-gaap_FinancingReceivableThresholdPeriodPastDueWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

X
- Definition The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
Name: | us-gaap_InterestAndFeeIncomeLoansAndLeases
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Recorded investment of consumer mortgage loan receivables secured by residential real estate properties for which formal foreclosure proceedings are in process. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 35 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL49126937-111524 + Details
Name: | us-gaap_MortgageLoansInProcessOfForeclosureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=acnb_ResidentialMortgageandCommercialLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_LoansInsuredOrGuaranteedByGovernmentAuthoritiesAxis=acnb_CARESActMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialMortgageMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=acnb_HomeEquityLinesOfCreditPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=acnb_NonaccrualMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=acnb_AccrualMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |