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Non-Performing Assets Including Trouble Debt Restructurings (Details 1) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended | 6 Months Ended
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Jun. 30, 2012 Loans In Accrual Status [Member] Commercial loans secured by real estate [Member] | Dec. 31, 2011 Loans in Non-Accrual Status [Member] | Jun. 30, 2012 Loans in Non-Accrual Status [Member] Commercial loans secured by real estate [Member]
Schedule of TDRs |  |  |
# of Loans | $ 1 | $ 5 | $ 2
Current Balance | $ 88 | $ 2,870 | $ 1,504
Concession Granted | Extension of maturity date | Extension of maturity date | Extension of maturity date

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- Definition The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The number of financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
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- Definition Description of how troubled debt restructurings that occurred during the period are factored into the determination of the allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524 + Details
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Namespace Prefix: | us-gaap_
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