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Non-Performing Assets Including Troubled Debt Restructurings (TDR) - concentration of COVID-19 related modifications within the loan portfolio (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 49,632	$ 49,063
% of Outstanding Non-PPP Loans	5.40%	5.30%
CRE | Commercial
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 47,501	$ 47,037
% of Outstanding Non-PPP Loans	7.10%	7.00%
Home Equity | Consumer
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 37	$ 83
% of Outstanding Non-PPP Loans	0.00%	0.10%
Real estate-residential mortgage
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 2,094	$ 1,943
% of Outstanding Non-PPP Loans	1.40%	1.30%

X

- Definition

Represents the amount of loans for which payment relief has been requested.

+ References

No definition available.

+ Details

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X

- Definition

Represents percentage of outstanding non PPP loans for which payment relief has been requested.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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