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PREFERRED STOCK (Narrative) (Details) (Series E Preferred Stock [Member], USD $)
In Thousands, except Share data, unless otherwise specified
 1 Months Ended
Aug. 11, 2011
Dec. 31, 2014
Class of Stock [Line Items]    
Shares of stock issued 21,000us-gaap_StockIssuedDuringPeriodSharesNewIssues  
Value of stock issued $ 21,000us-gaap_StockIssuedDuringPeriodValueNewIssues  
Dividend rate 5.00%us-gaap_PreferredStockDividendRatePercentage  
Aggregate liquidation preference   $ 21,000us-gaap_PreferredStockLiquidationPreferenceValue
Minimum Tier 1 capital required to pay dividends   90.00%asrv_MinimumPercentageTierOneCapitalToBeMaintained
Redemption price, percent of liquidation amount   100.00%asrv_PreferredStockRedemptionPricePercentage
Minimum [Member]
    
Class of Stock [Line Items]    
Dividend rate 1.00%us-gaap_PreferredStockDividendRatePercentage
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesEPreferredStockMember