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Allowance for Loan Losses (Details Textual) (USD $)	6 Months Ended
	Jun. 30, 2012 M
Allowance for Loan Losses (Textual) [Abstract]
Individual loan balance is classified as nonaccrual status or troubled debt restructure	$ 100,000
Loans past due as to maturity, days	90 days
Number of consecutive historical quarters for calculation of charge-off factor	12
Credits rated Pass-6 with aggregate balances	1,000,000
Minimum [Member]
Allowance for Loan Losses (Textual) [Abstract]
Credit reviews mandatory for loan aggregate balances with in 12-month period	250,000
Anticipated scope of range-of-coverage	55.00%
Commercial [Member]
Allowance for Loan Losses (Textual) [Abstract]
Individual loan balance is classified as nonaccrual status or troubled debt restructure	100,000
Number of consecutive historical quarters for calculation of charge-off factor	12
Credit reviews mandatory for loan aggregate balances with in 12-month period	$ 250,000
Real estate-mortgage [Member]
Allowance for Loan Losses (Textual) [Abstract]
Loans past due as to maturity, days	90 days
Consumer [Member]
Allowance for Loan Losses (Textual) [Abstract]
Loans past due as to maturity, days	90 days

X

- Definition

Allowance for loan losses presentation of credit rated with aggregate balances.

+ References

No definition available.

+ Details

Name:	asrv_AllowanceForLoanLossesPresentationOfCreditRatedWithAggregateBalances
Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:	asrv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Anticipated scope of range of coverage.

+ References

No definition available.

+ Details

Name:	asrv_AnticipatedScopeOfRangeOfCoverage
Namespace Prefix:	asrv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Credit reviews mandatory for loans aggregate balances.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Individual loan balance is classified as nonaccrual status or troubled debt restructure.

+ References

No definition available.

+ Details

Name:	asrv_IndividualLoanBalanceIsClassifiedAsNonaccrualStatusOrTroubledDebtRestructure
Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Loans past due as to maturity.

+ References

No definition available.

+ Details

Name:	asrv_LoansPastDueAsToMaturity
Namespace Prefix:	asrv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of consecutive historical quarters for calculation of charge-off factor.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration