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Non-Performing Assets Including Troubled Debt Restructurings (TDR) - concentration of COVID-19 related modifications within the loan portfolio (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2020 USD ($)
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 200,005
% of Outstanding Non-PPP Loans	23.20%
CRE | Commercial
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 190,276
% of Outstanding Non-PPP Loans	30.40%
Home Equity | Consumer
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 5,890
% of Outstanding Non-PPP Loans	6.00%
Real estate-residential mortgage
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 3,839
% of Outstanding Non-PPP Loans	2.80%

X

- Definition

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

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

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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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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X

- Details

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Balance Type:
Period Type:

X

- Details

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Balance Type:
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