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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES [Abstract]
Net income	$ 749us-gaap_NetIncomeLoss	$ 365us-gaap_NetIncomeLoss	$ 979us-gaap_NetIncomeLoss	$ 930us-gaap_NetIncomeLoss	$ 1,841us-gaap_NetIncomeLoss	$ 1,226us-gaap_NetIncomeLoss	$ 1,070us-gaap_NetIncomeLoss	$ 1,056us-gaap_NetIncomeLoss	$ 3,023us-gaap_NetIncomeLoss	$ 5,193us-gaap_NetIncomeLoss	$ 5,039us-gaap_NetIncomeLoss
Preferred stock dividends									210us-gaap_DividendsPreferredStock	209us-gaap_DividendsPreferredStock	828us-gaap_DividendsPreferredStock
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS									$ 2,813us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 4,984us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic	$ 4,211us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Weighted average common shares outstanding (basic)									18,793us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	18,942us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	19,685us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of stock options									115asrv_IncrementalCommonSharesAttributableToStockOptions	92asrv_IncrementalCommonSharesAttributableToStockOptions	62asrv_IncrementalCommonSharesAttributableToStockOptions
Weighted average common shares outstanding (diluted)									18,908us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	19,034us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	19,747us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Earnings per common share:
Basic	$ 0.04us-gaap_EarningsPerShareBasic	$ 0.02us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.06us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 0.05us-gaap_EarningsPerShareBasic	$ 0.15us-gaap_EarningsPerShareBasic	$ 0.26us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic
Diluted	$ 0.04us-gaap_EarningsPerShareDiluted	$ 0.02us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted	$ 0.06us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 0.05us-gaap_EarningsPerShareDiluted	$ 0.15us-gaap_EarningsPerShareDiluted	$ 0.26us-gaap_EarningsPerShareDiluted	$ 0.21us-gaap_EarningsPerShareDiluted

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