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DEPOSITS (Schedule of Interest Expense on Deposits) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
DEPOSITS [Abstract]
Interest bearing demand	$ 191us-gaap_InterestExpenseDomesticDepositLiabilitiesDemand	$ 138us-gaap_InterestExpenseDomesticDepositLiabilitiesDemand	$ 116us-gaap_InterestExpenseDomesticDepositLiabilitiesDemand
Savings	144us-gaap_InterestExpenseDomesticDepositLiabilitiesSavings	139us-gaap_InterestExpenseDomesticDepositLiabilitiesSavings	181us-gaap_InterestExpenseDomesticDepositLiabilitiesSavings
Money market	761us-gaap_InterestExpenseDomesticDepositLiabilitiesMoneyMarket	736us-gaap_InterestExpenseDomesticDepositLiabilitiesMoneyMarket	895us-gaap_InterestExpenseDomesticDepositLiabilitiesMoneyMarket
Certificates of deposit in denominations of $100,000 or more	268asrv_InterestExpenseDomesticDepositLiabilitiesTimeDepositsOneHundredThousandDollarsOrMore	289asrv_InterestExpenseDomesticDepositLiabilitiesTimeDepositsOneHundredThousandDollarsOrMore	435asrv_InterestExpenseDomesticDepositLiabilitiesTimeDepositsOneHundredThousandDollarsOrMore
Other time	3,525us-gaap_InterestExpenseDomesticDepositLiabilitiesOtherTimeDeposit	3,862us-gaap_InterestExpenseDomesticDepositLiabilitiesOtherTimeDeposit	4,875us-gaap_InterestExpenseDomesticDepositLiabilitiesOtherTimeDeposit
Total interest expense	$ 4,889us-gaap_InterestExpenseDeposits	$ 5,164us-gaap_InterestExpenseDeposits	$ 6,502us-gaap_InterestExpenseDeposits

X

- Definition

Interest Expense, Domestic Deposit Liabilities, Time Deposits $100,000 Or More.

+ References

No definition available.

+ Details

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- Details

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X

- Definition

Aggregate amount of interest expense on all deposits.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.6)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 6

-Article 9

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of interest expense on domestic demand deposit liabilities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.6)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 6

-Article 9

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Balance Type:	debit
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- Definition

Amount of interest expense on domestic money market demand account deposit liabilities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.6)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 6

-Article 9

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X

- Definition

Amount of interest expense on domestic time deposit liabilities other than certificates of liabilities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.6)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 6

-Article 9

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X

- Definition

Amount of interest expense on domestic savings deposit liabilities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.6)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 6

-Article 9

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