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ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items] |
Threshold for individually evaluating loans | $ 250
Threshold for discontinuing accrual of interest income | 90 days
Pass [Member] |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Minimum individual loan balance requiring quarterly review | 1,000
Special Mention [Member] |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Minimum individual loan balance requiring quarterly review | 250
Doubtful [Member] |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Threshold for individually evaluating loans | 100
Minimum individual loan balance requiring quarterly review | 100
Commercial [Member] |
Financing Receivable, Allowance for Credit Losses [Line Items] |
Threshold for individually evaluating loans | $ 250
Minimum percent of portfolio to be reviewed | 55.00%
Number of consecutive historical quarters for calculation of charge-off factor | 12

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- Definition Financing Receivable, Allowance For Credit Losses, Threshold For Individually Evaluating Of Impairment. + References No definition available. + Details
Name: | asrv_FinancingReceivableAllowanceForCreditLossesThresholdForIndividuallyEvaluatingOfImpairment
Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing Receivable, Minimum Percent Required To Be Reviewed. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Financing Receivable, Threshold Balance Which Requires Quarterly Reviews. + References No definition available. + Details
Name: | asrv_FinancingReceivableThresholdBalanceWhichRequiresQuarterlyReviews
Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of consecutive historical quarters for calculation of charge-off factor. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Threshold period past due for financing receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | asrv_ThresholdPeriodPastDueForWriteOffOfFinancingReceivable
Namespace Prefix: | asrv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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