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Preferred Stock (Preferred Dividend Stock Period Annualized) (Details) (Series E Preferred Stock [Member]) | 3 Months Ended
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Mar. 31, 2015
Preferred Stock [Line Items] |  |
Annualized Dividend Rate | 9.00%us-gaap_PreferredStockDividendRatePercentage |
Term 1 [Member] |  |
Preferred Stock [Line Items] |  |
Annualized Dividend Rate | 5.00%us-gaap_PreferredStockDividendRatePercentage / asrv_DividendRateOfPreferredStockAxis = asrv_TermOneMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
Term 4 [Member] |  |
Preferred Stock [Line Items] |  |
Annualized Dividend Rate | 9.00%us-gaap_PreferredStockDividendRatePercentage / asrv_DividendRateOfPreferredStockAxis = asrv_TermFourMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember | [1]
Minimum [Member] | Term 1 [Member] |  |
Preferred Stock [Line Items] |  |
Dividend Annualized Period | Aug. 11, 2011 |
Minimum [Member] | Term 2 [Member] |  |
Preferred Stock [Line Items] |  |
Annualized Dividend Rate | 1.00%us-gaap_PreferredStockDividendRatePercentage / asrv_DividendRateOfPreferredStockAxis = asrv_TermTwoMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
Dividend Annualized Period | Jan. 01, 2012 |
Minimum [Member] | Term 3 [Member] |  |
Preferred Stock [Line Items] |  |
Annualized Dividend Rate | 1.00%us-gaap_PreferredStockDividendRatePercentage / asrv_DividendRateOfPreferredStockAxis = asrv_TermThreeMember / us-gaap_RangeAxis = us-gaap_MinimumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember | [2]
Dividend Annualized Period | Jan. 01, 2014 |
Minimum [Member] | Term 4 [Member] |  |
Preferred Stock [Line Items] |  |
Dividend Annualized Period | Feb. 08, 2016 |
Maximum [Member] | Term 1 [Member] |  |
Preferred Stock [Line Items] |  |
Dividend Annualized Period | Dec. 31, 2011 |
Maximum [Member] | Term 2 [Member] |  |
Preferred Stock [Line Items] |  |
Annualized Dividend Rate | 5.00%us-gaap_PreferredStockDividendRatePercentage / asrv_DividendRateOfPreferredStockAxis = asrv_TermTwoMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember |
Dividend Annualized Period | Dec. 31, 2014 |
Maximum [Member] | Term 3 [Member] |  |
Preferred Stock [Line Items] |  |
Annualized Dividend Rate | 7.00%us-gaap_PreferredStockDividendRatePercentage / asrv_DividendRateOfPreferredStockAxis = asrv_TermThreeMember / us-gaap_RangeAxis = us-gaap_MaximumMember / us-gaap_StatementClassOfStockAxis = us-gaap_SeriesEPreferredStockMember | [2]
Dividend Annualized Period | Feb. 07, 2016 |
[1] | Beginning on February 8, 2016, the dividend rate will be fixed at nine percent (9%) per annum.
[2] | Between January 1, 2014 and February 7, 2016, the Company's dividend rate was fixed at 1% based upon the level of percentage change in QSBL between September 30, 2013 and the Baseline.

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- Definition Dividend annualized period. + References No definition available. + Details
Name: | asrv_DividendAnnualizedPeriod
Namespace Prefix: | asrv_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | asrv_PreferredStockLineItems
Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |