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Preferred Stock (Details) (Series E Preferred Stock [Member]) |  |  |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2012 | Jun. 30, 2012 Term 1 [Member] | Dec. 31, 2011 Term 1 [Member] | Jun. 30, 2012 Term 2 [Member] | Dec. 31, 2011 Term 2 [Member] | Jun. 30, 2012 Term 3 [Member] | Dec. 31, 2011 Term 3 [Member] | Dec. 31, 2011 Term 4 [Member] | Jun. 30, 2012 Minimum [Member] Term 1 [Member] | Jun. 30, 2012 Minimum [Member] Term 2 [Member] | Jun. 30, 2012 Minimum [Member] Term 3 [Member] | Jun. 30, 2012 Minimum [Member] Term 4 [Member] | Jun. 30, 2012 Maximum [Member] Term 2 [Member] | Jun. 30, 2012 Maximum [Member] Term 3 [Member]
Dividends, Preferred Stock [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend Annualized Period |  | Dec. 31, 2011 | Aug. 11, 2011 | Dec. 31, 2013 | Jan. 01, 2012 | Feb. 07, 2016 | Jan. 01, 2014 | Feb. 08, 2016 |  |  |  |  |  |
Redemption | Redemption |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred stock, interest rate, percentage |  |  |  |  |  |  |  |  | 5.00% | 1.00% | 1.00% | 9.00% | 5.00% | 7.00%

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- Definition Dividend annualized period. + References No definition available. + Details
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- Definition Redemption. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_DividendsPreferredStockAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration

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- Definition The percentage rate used to calculate dividend payments on preferred stock. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration