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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
BUSINESS AND NATURE OF OPERATIONS:
Number of locations	17us-gaap_NumberOfStores
Number of counties	5asrv_NumberOfCountiesInWhichEntityOperates
Trust and financial services and administers assets	$ 1,800,000,000us-gaap_AssetsHeldInTrust
FEDERAL HOME LOAN BANK STOCK:
Par value	$ 100asrv_FederalHomeLoanBankStockParValue
LOANS:
Threshold for discontinuing accrual of interest income	90 days
ALLOWANCE FOR LOAN LOSSES AND CHARGE-OFF PROCEDURES:
Threshold for individually evaluating loans	250,000asrv_FinancingReceivableAllowanceForCreditLossesThresholdForIndividuallyEvaluatingOfImpairment
EARNINGS PER COMMON SHARE:
Shares not included in computation of earnings per common share	3,625us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	103,570us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	49,842us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Exercisable at end of year	$ 2.36us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	$ 2.25us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	$ 2.29us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice
STOCK-BASED COMPENSATION:
Pretax compensation expense	42,000us-gaap_AllocatedShareBasedCompensationExpense	82,000us-gaap_AllocatedShareBasedCompensationExpense	38,000us-gaap_AllocatedShareBasedCompensationExpense
CONSOLIDATED STATEMENT OF CASH FLOWS:
Income tax payments	1,063,000us-gaap_IncomeTaxesPaid	137,000us-gaap_IncomeTaxesPaid	142,000us-gaap_IncomeTaxesPaid
Non-cash transfers to other real estate owned	660,000us-gaap_TransferOfOtherRealEstate	766,000us-gaap_TransferOfOtherRealEstate	1,266,000us-gaap_TransferOfOtherRealEstate
Total interest payments	6,475,000us-gaap_InterestPaid	6,781,000us-gaap_InterestPaid	8,154,000us-gaap_InterestPaid
Minimum [Member]
EARNINGS PER COMMON SHARE:
Exercisable at end of year	$ 4.60us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 3.05us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember	$ 2.80us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember
Maximum [Member]
EARNINGS PER COMMON SHARE:
Exercisable at end of year	$ 5.22us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 5.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember	$ 5.75us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember
Commercial [Member]
ALLOWANCE FOR LOAN LOSSES AND CHARGE-OFF PROCEDURES:
Threshold for individually evaluating loans	250,000asrv_FinancingReceivableAllowanceForCreditLossesThresholdForIndividuallyEvaluatingOfImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = us-gaap_CommercialPortfolioSegmentMember
Small Business Loans [Member]
ALLOWANCE FOR LOAN LOSSES AND CHARGE-OFF PROCEDURES:
Threshold for collectively evaluating loans	$ 250,000asrv_FinancingReceivableAllowanceForCreditLossesThresholdForCollecitvelyEvaluatingOfImpairment / us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis = asrv_SmallBusinessLoansMember
Buildings [Member]
PREMISES AND EQUIPMENT:
Useful life	30 years
Equipment [Member]
PREMISES AND EQUIPMENT:
Useful life	10 years

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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