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SHORT-TERM BORROWINGS (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Short-term Debt [Line Items]
Average maturity	1 day	1 day	1 day
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Balance
Maximum indebtedness at any month end
Average balance during year		959us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	117us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Average rate paid for the year	0.00%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	0.34%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	0.34%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Interest rate on year end balance	0.00%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	0.00%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember	0.00%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = us-gaap_FederalFundsPurchasedMember
Short-Term Borrowings [Member]
Short-term Debt [Line Items]
Balance	38,880us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember	41,555us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember	15,660us-gaap_ShortTermBorrowings / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember
Maximum indebtedness at any month end	47,762us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember	41,555us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember	19,755us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember
Average balance during year	18,783us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember	16,482us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember	5,225us-gaap_ShorttermDebtAverageOutstandingAmount / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember
Average rate paid for the year	0.29%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember	0.26%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember	0.20%us-gaap_DebtInstrumentInterestRateDuringPeriod / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember
Interest rate on year end balance	0.27%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember	0.25%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember	0.25%us-gaap_ShortTermDebtWeightedAverageInterestRate / us-gaap_ShortTermDebtTypeAxis = asrv_ShortTermDebtExcludingFederalFundsPurchasedMember

X

- Definition

Debt Instrument, Weighted Average Term.

+ References

No definition available.

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X

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

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- Definition

Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

+ References

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-Name Regulation S-X (SX)

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For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, average borrowings during the period.

+ References

No definition available.

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- Definition

For the form of debt having an initial term of less than one year or less than the normal operating cycle, if longer, maximum month-end borrowings during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 210

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-Section S99

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- Definition

Weighted average interest rate of short-term debt outstanding.

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