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Pension Benefits (Details Textual)	Jun. 30, 2019 Hour
Pension Benefits [Line Items]
Minimum number of annual hours	1,000
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock	10.00%

X

- Definition

Defined Benefit Plan, Maximum Percent Of Assets Comprised Of Entity Common Stock.

+ References

No definition available.

+ Details

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

X

- Definition

Defined Benefit Plan, Minimum Number Of Annual Employee Hours.

+ References

No definition available.

+ Details

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

X

- Definition

Pension benefits.

+ References

No definition available.

+ Details

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