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Preferred Stock (Preferred Dividend Stock Period Annualized) (Details) (Series E Preferred Stock [Member])
 3 Months Ended
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.