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Non-Performing Assets Including Trouble Debt Restructurings (Details 1) (USD $) In Thousands, unless otherwise specified	6 Months Ended	12 Months Ended	6 Months Ended
	Jun. 30, 2012 Loans In Accrual Status [Member] Commercial loans secured by real estate [Member]	Dec. 31, 2011 Loans in Non-Accrual Status [Member]	Jun. 30, 2012 Loans in Non-Accrual Status [Member] Commercial loans secured by real estate [Member]
Schedule of TDRs
# of Loans	$ 1	$ 5	$ 2
Current Balance	$ 88	$ 2,870	$ 1,504
Concession Granted	Extension of maturity date	Extension of maturity date	Extension of maturity date

X

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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

X

- Definition

The number of financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	asrv_TroubledDebtRestructuringNumberOfContracts
Namespace Prefix:	asrv_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

X

- Definition

Description of how troubled debt restructurings that occurred during the period are factored into the determination of the allowance for credit losses.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 33

-URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration