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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	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 231	$ 7,748
% of Outstanding Non-PPP Loans	0.02%	0.80%
Commercial loans secured by Non-Owner Occupied real estate [Member] | Commercial
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 199	$ 7,488
% of Outstanding Non-PPP Loans	0.03%	1.08%
Home Equity | Consumer.
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested		$ 57
% of Outstanding Non-PPP Loans		0.06%
Real estate - residential mortgage
Financing Receivable, Modifications [Line Items]
Loans For Which Payment Relief Has Been Requested	$ 32	$ 203
% of Outstanding Non-PPP Loans	0.02%	0.11%

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:	dtr-types: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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: