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Non-Performing Assets Including Troubled Debt Restructurings (TDR) - Additional information (Details) - USD ($)	Sep. 30, 2019	Dec. 31, 2018
Non-Performing Assets Including Troubled Debt Restructurings (TDR)
ALL reserve for TDR's	$ 96,000	$ 11,000

X

- Definition

Allowance for loan and lease losses pertaining to troubled debt restructurings.

+ References

No definition available.

+ Details

Name:	asrv_AllowanceForLoanAndLeaseLossesTroubledDebtRestructurings
Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Non performing assets including trouble debt restructurings.

+ References

No definition available.

+ Details

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