XML 69 R53.htm IDEA: XBRL DOCUMENT
v3.8.0.1

SECURITIES (Schedule of Unrealized Loss on Investments) (Details) $ in Thousands | Dec. 31, 2017 USD ($) Security | Dec. 31, 2016 USD ($)
--- | --- | ---
Schedule of Investments [Line Items] |  |
Securities Available for sale, Less than 12 Months: Fair Value | $ 51,045 | $ 86,388
Securities Available for sale, Less than 12 Months: Unrealized Losses | 509 | 1,713
Securities Available for sale, 12 Months or More: Fair Value | 64,109 | 0
Securities Available for sale, 12 Months or More: Unrealized Losses | 1,461 | 0
Securities Available for sale, Total: Fair Value | 115,154 | 86,388
Securities Available for sale, Total Unrealized Loss | 1,970 | 1,713
Securities Held to maturity, Less than 12 Months: Fair Value | 9,931 | 25,902
Securities Held to maturity, Less than 12 Months: Unrealized Losses | 44 | 379
Securities Held to maturity, 12 Months or More, Fair Value | 21,986 | 0
Securities Held to maturity, 12 Months or More, Unrealized Losses | 293 | 0
Securities Held to maturity, Total: Fair Value | 31,917 | 25,902
Securities Held to maturity, Total Unrealized Losses | 337 | 379
U.S. Government and agencies |  |
Schedule of Investments [Line Items] |  |
Securities Available for sale, Less than 12 Months: Fair Value | 42,775 | 71,454
Securities Available for sale, Less than 12 Months: Unrealized Losses | 445 | 1,529
Securities Available for sale, 12 Months or More: Fair Value | 58,279 | 0
Securities Available for sale, 12 Months or More: Unrealized Losses | 1,373 | 0
Securities Available for sale, Total: Fair Value | 101,054 | 71,454
Securities Available for sale, Total Unrealized Loss | 1,818 | 1,529
Securities Held to maturity, Less than 12 Months: Fair Value | 4,985 | 12,946
Securities Held to maturity, Less than 12 Months: Unrealized Losses | 15 | 54
Securities Held to maturity, 12 Months or More, Fair Value | 10,916 | 0
Securities Held to maturity, 12 Months or More, Unrealized Losses | 84 | 0
Securities Held to maturity, Total: Fair Value | 15,901 | 12,946
Securities Held to maturity, Total Unrealized Losses | $ 99 | 54
Available for sale securities in unrealized loss positions | Security | 64 |
Available for sale securities in unrealized loss positions, percentage of amortized cost (individually did not exceed) | 5.00% |
Available for sale securities in unrealized loss positions for 12 months or more | Security | 32 |
Held to maturity securities in unrealized loss positions | Security | 9 |
Held to maturity securities in unrealized loss positions, percentage of amortized cost (individually did not exceed) | 2.00% |
Held to maturity securities in unrealized loss positions for 12 months or more | Security | 6 |
Residential Mortgage Backed Securities |  |
Schedule of Investments [Line Items] |  |
Securities Available for sale, Less than 12 Months: Fair Value | $ 7,228 | 8,966
Securities Available for sale, Less than 12 Months: Unrealized Losses | 56 | 81
Securities Available for sale, 12 Months or More: Fair Value | 2,845 | 0
Securities Available for sale, 12 Months or More: Unrealized Losses | 45 | 0
Securities Available for sale, Total: Fair Value | 10,073 | 8,966
Securities Available for sale, Total Unrealized Loss | 101 | 81
Securities Held to maturity, Less than 12 Months: Fair Value | 4,946 | 12,956
Securities Held to maturity, Less than 12 Months: Unrealized Losses | 29 | 325
Securities Held to maturity, 12 Months or More, Fair Value | 11,070 | 0
Securities Held to maturity, 12 Months or More, Unrealized Losses | 209 | 0
Securities Held to maturity, Total: Fair Value | 16,016 | 12,956
Securities Held to maturity, Total Unrealized Losses | $ 238 | 325
Available for sale securities in unrealized loss positions | Security | 15 |
Available for sale securities in unrealized loss positions, percentage of amortized cost (individually did not exceed) | 2.00% |
Available for sale securities in unrealized loss positions for 12 months or more | Security | 3 |
Held to maturity securities in unrealized loss positions | Security | 21 |
Held to maturity securities in unrealized loss positions, percentage of amortized cost (individually did not exceed) | 3.00% |
Held to maturity securities in unrealized loss positions for 12 months or more | Security | 13 |
State and municipal |  |
Schedule of Investments [Line Items] |  |
Securities Available for sale, Less than 12 Months: Fair Value | $ 1,042 | 4,933
Securities Available for sale, Less than 12 Months: Unrealized Losses | 8 | 94
Securities Available for sale, 12 Months or More: Fair Value | 1,950 | 0
Securities Available for sale, 12 Months or More: Unrealized Losses | 34 | 0
Securities Available for sale, Total: Fair Value | 2,992 | 4,933
Securities Available for sale, Total Unrealized Loss | $ 42 | 94
Available for sale securities in unrealized loss positions | Security | 14 |
Available for sale securities in unrealized loss positions, percentage of amortized cost (individually did not exceed) | 3.00% |
Available for sale securities in unrealized loss positions for 12 months or more | Security | 8 |
Corporate bonds |  |
Schedule of Investments [Line Items] |  |
Securities Available for sale, Total Unrealized Loss | $ 0 | 0
CRA mutual fund |  |
Schedule of Investments [Line Items] |  |
Securities Available for sale, Less than 12 Months: Fair Value | 0 | 1,035
Securities Available for sale, Less than 12 Months: Unrealized Losses | 0 | 9
Securities Available for sale, 12 Months or More: Fair Value | 1,035 | 0
Securities Available for sale, 12 Months or More: Unrealized Losses | 9 | 0
Securities Available for sale, Total: Fair Value | 1,035 | 1,035
Securities Available for sale, Total Unrealized Loss | $ 9 | 9
Available for sale securities in unrealized loss positions, percentage of amortized cost (individually did not exceed) | 1.00% |
Stock In Other Banks |  |
Schedule of Investments [Line Items] |  |
Securities Available for sale, Total Unrealized Loss | $ 0 | $ 0

X
- Definition Available-for-sale, Securities in Unrealized Loss Positions, Unrealized Losses as Percentage of Amortized Cost + References No definition available. + Details
Name: | acnb_AvailableforsaleSecuritiesinUnrealizedLossPositionsUnrealizedLossesasPercentageofAmortizedCost
Namespace Prefix: | acnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Held-to-maturity, Number of Securities in Continuous Loss Positions for 12 Months or More + References No definition available. + Details
Name: | acnb_HeldtomaturityNumberofSecuritiesinContinuousLossPositionsfor12MonthsorMore
Namespace Prefix: | acnb_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Held-to-maturity, Securities in Unrealized Loss Positions, Unrealized Losses as Percentage of Amortized Cost + References No definition available. + Details
Name: | acnb_HeldtomaturitySecuritiesinUnrealizedLossPositionsUnrealizedLossesasPercentageofAmortizedCost
Namespace Prefix: | acnb_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities in an unrealized loss position which are categorized neither as held-to-maturity nor trading securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of investment positions in available-for-sale investments in a continuous unrealized loss position for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Number of investment positions in available-for-sale investments that have been in a continuous unrealized loss position for greater than or equal to a year for which an other-than-temporary impairment (OTTI) has not been recognized in the income statement. + References No definition available. + Details
Name: | us-gaap_AvailableforsaleSecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositionsGreaterThanOrEqualToOneYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of securities categorized as held-to-maturity which are in an unrealized loss position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity that have been in a continuous loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThan12MonthsAccumulatedLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of securities categorized as held-to-maturity that have been in a continuous unrealized loss position for less than twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionLessThanTwelveMonthsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition This item represents the fair value of securities categorized as held-to-maturity securities that have been in a continuous unrealized loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesContinuousUnrealizedLossPositionTwelveMonthsOrLongerFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Disclosure regarding factors used to determine that the impairment of securities categorized as held-to-maturity where cost exceeds fair value is not an other than temporary impairment (OTTI). This item contains disclosure of the number of investment positions in the held-to-maturity investments determined to be temporarily impaired. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
Name: | us-gaap_HeldToMaturitySecuritiesInUnrealizedLossPositionsQualitativeDisclosureNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

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_ScheduleOfInvestmentsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_ResidentialMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=acnb_CraMutualFundMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis=acnb_StockInOtherBanksMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |