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DERIVATIVE HEDGING INSTRUMENTS (Details)	3 Months Ended
	Mar. 31, 2017 USD ($)
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments	$ 0
Derivative One [Member]
Derivative, Inception Date	Dec. 01, 2017
Derivative, Maturity Date	Dec. 01, 2027
Derivative, Swap Type	FAIR VALUE
Derivative, Notional Amount	$ 5,000,000
Derivative Instruments Interest Rate, Received	4.50%
Derivative Instruments Interest Rate, Paid	3.10%
Derivative Instruments, Repricing Frequency	MONTHLY
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments	$ 15,367
Derivative Two [Member]
Derivative, Inception Date	Dec. 01, 2027
Derivative, Maturity Date	Dec. 01, 2027
Derivative, Swap Type	FAIR VALUE
Derivative, Notional Amount	$ 5,000,000
Derivative Instruments Interest Rate, Received	3.10%
Derivative Instruments Interest Rate, Paid	4.50%
Derivative Instruments, Repricing Frequency	MONTHLY
Increase (Decrease) in Fair Value of Interest Rate Fair Value Hedging Instruments	$ (15,367)

X

- Definition

The percentage of interest paid during the period under interest rate swap transaction.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of interest received during the period under interest rate swap transaction.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
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X

- Definition

Description for repricing frequency of derivative intruments.

+ References

No definition available.

+ Details

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X

- Definition

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

X

- Definition

Date the entity entered into the derivative contract, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
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X

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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

X

- Definition

Indicates whether the entity pays a variable or fixed price on a price risk swap.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of unrealized gain (loss) related to the fair value of interest rate derivatives designated as fair value hedging instruments, as offset by the gain (loss) on the hedged item to the extent that the fair value hedge is determined to be effective.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4A
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5618551-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4C
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959

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