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Revenue Recognition - Additional information (Details)	9 Months Ended
	Sep. 30, 2019
Revenue Associated With Financial Instruments [Member]
Percentage Of Entity Revenue	80.50%

X

- Definition

Represents the percentage of entity revenue.

+ References

No definition available.

+ Details

Name:	asrv_PercentageOfEntityRevenue
Namespace Prefix:	asrv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_IncomeStatementLocationAxis=asrv_RevenueAssociatedWithFinancialInstrumentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: