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PREFERRED STOCK (Schedule of Preferred Dividend Stock Period Annualized) (Details) (Series E Preferred Stock [Member])
 1 Months Ended 12 Months Ended
Aug. 11, 2011
Dec. 31, 2014
Preferred Stock [Line Items]    
Annualized Dividend Rate 5.00%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
Minimum [Member]    
Preferred Stock [Line Items]    
Annualized Dividend Rate 1.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember		  
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		 [1]
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, 2013
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		 [1]
Dividend Annualized Period   Feb. 07, 2016
[1] 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.