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ADVANCES FROM FEDERAL HOME LOAN BANK AND GUARANTEED JUNIOR SUBORDINATED DEFERRABLE INTEREST DEBENTURES (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2005	Dec. 31, 2004	Dec. 31, 2013
ADVANCES FROM FEDERAL HOME LOAN BANK AND GUARANTEED JUNIOR SUBORDINATED DEFERRABLE INTEREST DEBENTURES [Abstract]
Overnight borrowing capability at the FHLB	$ 347,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresAmountOfAvailableUnusedFunds
Unsecured federal funds lines with correspondent banks	39,000,000us-gaap_FederalHomeLoanBankAdvancesGeneralDebtObligationsDisclosuresMaximumAmountAvailable
Debt Instrument [Line Items]
Guaranteed junior subordinated deferrable interest debentures	13,085,000us-gaap_JuniorSubordinatedNotes			13,085,000us-gaap_JuniorSubordinatedNotes
Guaranteed Junior Subordinated Deferrable Interest Debentures [Member]
Debt Instrument [Line Items]
Debt instrument, principal amount	34,500,000us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = asrv_GuaranteedJuniorSubordinatedDeferrableInterestDebenturesMember
Interest rate	8.45%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = asrv_GuaranteedJuniorSubordinatedDeferrableInterestDebenturesMember
Maturity date	Jun. 30, 2028
Earliest redemption date	Jun. 30, 2003
Unamortized deferred issuance costs	209,000us-gaap_DeferredFinanceCostsNet / us-gaap_DebtInstrumentAxis = asrv_GuaranteedJuniorSubordinatedDeferrableInterestDebenturesMember
Early redemption of debt		22,500,000us-gaap_EarlyRepaymentOfSubordinatedDebt / us-gaap_DebtInstrumentAxis = asrv_GuaranteedJuniorSubordinatedDeferrableInterestDebenturesMember	22,500,000us-gaap_EarlyRepaymentOfSubordinatedDebt / us-gaap_DebtInstrumentAxis = asrv_GuaranteedJuniorSubordinatedDeferrableInterestDebenturesMember
Guaranteed junior subordinated deferrable interest debentures	$ 13,100,000us-gaap_JuniorSubordinatedNotes / us-gaap_DebtInstrumentAxis = asrv_GuaranteedJuniorSubordinatedDeferrableInterestDebenturesMember			$ 13,100,000us-gaap_JuniorSubordinatedNotes / us-gaap_DebtInstrumentAxis = asrv_GuaranteedJuniorSubordinatedDeferrableInterestDebenturesMember

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Earliest date before maturity when the issuer can call the outstanding debt instrument for repayment or conversion to equity, in CCYY-MM-DD format.

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Contractual interest rate for funds borrowed, under the debt agreement.

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