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Non-performing Assets Including Troubled Debt Restructurings (Narrative) (Details) (USD $) | 3 Months Ended |
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Mar. 31, 2015 | Mar. 31, 2014
Nonperforming Assets Including Troubled Debt Restructurings [Abstract] |  |
Aggregate of multiple consecutive maturity date extensions delay in payment, days | 120 days |
Timely payments on contract terms for minimum consecutive months prior to consideration for removing loan from TDR status | 6 months |
Minimum consecutive months payment for removing the loan from non-accrual status | 6 months |
ALL reserve for TDR's | $ 502,000 asrv_AllowanceForLoanAndLeaseLossesTroubledDebtRestructurings | $ 365,000 asrv_AllowanceForLoanAndLeaseLossesTroubledDebtRestructurings

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- Definition Aggregate of multiple consecutive maturity date extensions delay in payment. + References No definition available. + Details
Name: | asrv_AggregateOfMultipleConsecutiveMaturityDateExtensionsDelayInPaymentDays
Namespace Prefix: | asrv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Allowance for loan and lease losses pertaining to troubled debt restructurings. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Minimum number of consecutive months payment for removing the loan from non-accrual status. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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- Definition Timely payments on contract terms for minimum consecutive months prior to consideration for removing loan from TDR status. + References No definition available. + Details
Name: | asrv_TimelyPaymentsOnContractTermsForMinimumConsecutiveMonthsPriorToConsiderationForRemovingLoanFromTdrStatus
Namespace Prefix: | asrv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration