XML 77 R62.htm IDEA: XBRL DOCUMENT
v3.8.0.1

INVESTMENT SECURITIES (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2005
Investments [Line Items] |  |  |  |  |  |  |
Gross investment gains |  | $ 115,000 |  | $ 183,000 |  | $ 107,000 |
Gross investment losses |  |  |  | (6,000) |  |  | $ (36,000)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  | 76,000 |  | 117,000 |  | 46,000 |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  | 39,000 | [1] | 60,000 | [1] | 25,000 |
Investment Securities: |  |  |  |  |  |  |
Consolidated investment securities portfolio modified, years | 3 years 8 months 8 days |  |  |  |  |  |
Proceeds from sales of investment securities — available for sale |  | 8,143,000 |  | 8,966,000 |  | $ 3,570,000 |
Book value of securities available for sale and held to maturity |  | $ 117,181,000 |  | $ 104,953,000 |  |  |
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions |  | 133 |  |  |  |  |
Corporate bonds [Member] |  |  |  |  |  |  |
Investment Securities: |  |  |  |  |  |  |
Available For Sale Securities Debt Maturities Weighted Average Maturity Term |  | 5 years 5 months 8 days |  |  |  |  |
U.S. Agency [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Portfolio rated |  | 10.00% |  |  |  |  |
Investment Securities: |  |  |  |  |  |  |
Available For Sale Securities Debt Maturities Weighted Average Maturity Term |  | 10 years 4 months 17 days |  |  |  |  |
Held To Maturity Securities Weighted Average Maturity Term |  | 4 years 6 months 25 days |  |  |  |  |
U.S. Agency mortgage-backed securities [Member] |  |  |  |  |  |  |
Investment Securities: |  |  |  |  |  |  |
Available For Sale Securities Debt Maturities Weighted Average Maturity Term |  | 4 years 7 months 6 days |  |  |  |  |
Held To Maturity Securities Weighted Average Maturity Term |  | 6 years 6 months 4 days |  |  |  |  |
Standard & Poor's, AAA Rating [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Portfolio rated |  | 57.80% |  | 63.50% |  |  |
Standard & Poor's, A Rating [Member] |  |  |  |  |  |  |
Investments [Line Items] |  |  |  |  |  |  |
Portfolio rated |  | 9.70% |  |  |  |  |
[1] | Amounts in parentheses indicate credits.

X
- Definition Available For Sale Securities, Debt Maturities, Weighted Average Maturity Term + References No definition available. + Details
Name: | asrv_AvailableForSaleSecuritiesDebtMaturitiesWeightedAverageMaturityTerm
Namespace Prefix: | asrv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Carrying value of available for sale held to maturity and federal home loan bank. + References No definition available. + Details
Name: | asrv_CarryingValueOfAvailableForSaleHeldToMaturityAndFederalHomeLoanBankBorrowings
Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Consolidated investment securities portfolio modified, years. + References No definition available. + Details
Name: | asrv_ConsolidatedInvestmentSecuritiesPortfolioModifiedYears
Namespace Prefix: | asrv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The gain realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References No definition available. + Details
Name: | asrv_GainOnSaleOfSecurities
Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Held To Maturity Securities, Weighted Average Maturity Term. + References No definition available. + Details
Name: | asrv_HeldToMaturitySecuritiesWeightedAverageMaturityTerm
Namespace Prefix: | asrv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Investment securities. + References No definition available. + Details
Name: | asrv_InvestmentSecuritiesAdditionalTextualAbstract
Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | asrv_InvestmentsLineItems
Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The loss realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. + References No definition available. + Details
Name: | asrv_LossOnSaleOfSecurities
Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Percentage of investment securities portfolio rated. + References No definition available. + Details
Name: | asrv_PercentageOfInvestmentSecuritiesPortfolioRated
Namespace Prefix: | asrv_
Data Type: | num:percentItemType
Balance Type: | na
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 Amount after tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27357-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e640-108580 + Details
Name: | us-gaap_OtherComprehensiveIncomeLossReclassificationAdjustmentFromAOCIForSaleOfSecuritiesTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3179-108585 + Details
Name: | us-gaap_ProceedsFromSaleOfAvailableForSaleSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_CorporateBondSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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

X
- Details
Name: | us-gaap_CreditRatingStandardPoorsAxis=us-gaap_StandardPoorsAAARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditRatingStandardPoorsAxis=us-gaap_StandardPoorsARatingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |