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ALLOWANCE FOR LOAN LOSSES (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Threshold for individually evaluating loans	$ 250
Threshold for discontinuing accrual of interest income	90 days
Pass [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Minimum individual loan balance requiring quarterly review	1,000
Special Mention [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Minimum individual loan balance requiring quarterly review	250
Doubtful [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Threshold for individually evaluating loans	100
Minimum individual loan balance requiring quarterly review	100
Commercial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Threshold for individually evaluating loans	$ 250
Minimum percent of portfolio to be reviewed	55.00%
Number of consecutive historical quarters for calculation of charge-off factor	12

X

- Definition

Financing Receivable, Allowance For Credit Losses, Threshold For Individually Evaluating Of Impairment.

+ References

No definition available.

+ Details

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

X

- Definition

Financing Receivable, Minimum Percent Required To Be Reviewed.

+ References

No definition available.

+ Details

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

X

- Definition

Financing Receivable, Threshold Balance Which Requires Quarterly Reviews.

+ References

No definition available.

+ Details

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

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

X

- Definition

Threshold period past due for financing receivable to write off as uncollectible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration