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Earnings Per Common Share (Summary of Earnings Per Common Share) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Numerator:    
Net income $ 1,369us-gaap_NetIncomeLoss $ 930us-gaap_NetIncomeLoss
Preferred stock dividends 53us-gaap_DividendsPreferredStock 53us-gaap_DividendsPreferredStock
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS $ 1,316us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic $ 877us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator:    
Weighted average common shares outstanding (basic) 18,851us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 18,786us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of stock options 58asrv_IncrementalCommonSharesAttributableToStockOptions 118asrv_IncrementalCommonSharesAttributableToStockOptions
Weighted average common shares outstanding (diluted) 18,909us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 18,904us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per common share:    
Basic $ 0.07us-gaap_EarningsPerShareBasic $ 0.05us-gaap_EarningsPerShareBasic
Diluted $ 0.07us-gaap_EarningsPerShareDiluted $ 0.05us-gaap_EarningsPerShareDiluted