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Pension Benefits (Narrative) (Details)	3 Months Ended
	Mar. 31, 2013
Pension Benefits [Line Items]
Noncontributory defined benefit pension plan, least work hours per year	1,000
Participants vested interest accrued benefit, service period, years	5 years
Benefits plan based on service and average annual earnings for highest consecutive calendar years	5 years
Benefits plan based on service and average annual earnings for highest consecutive calendar years from final employment period years	10 years
Maximum [Member] | AmeriServ Financial Inc [Member]
Pension Benefits [Line Items]
Plan assets, listed common stocks, percentage	10.00%

X

- Definition

Benefits plan based on service and average annual earnings for highest consecutive calendar years.

+ References

No definition available.

+ Details

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X

- Definition

Benefits plan based on service and average annual earnings for highest consecutive calendar years from final employment period years.

+ References

No definition available.

+ Details

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X

- Definition

Noncontributory defined benefit pension plan, least work hours per year.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
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Balance Type:	na
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X

- Definition

Participants vested interest accrued benefit, service period.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
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- Details

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X

- Definition

Target allocation of investments of this type to total plan assets presented on a weighted average basis.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(i)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)(i)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920

+ Details

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