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DEPOSITS - Additional information (Details)	Dec. 31, 2024 USD ($) item	Dec. 31, 2023 USD ($)
DEPOSITS.
Time deposits meet or exceed the FDIC insurance limit	$ 101,200,000	$ 86,100,000
Related party deposits	$ 4,219,000	3,813,000
Number of deposit exceeding threshold percentage of total deposits | item	1
Percentage of deposits	5.00%
Deposits exceeding threshold percentage of total deposits	$ 86,700,000	$ 52,900,000

X

- Definition

Amount of deposits exceeding the threshold percentage of total deposits.

+ References

No definition available.

+ Details

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

X

- Definition

Number of deposits exceeding the threshold percentage of total deposits.

+ References

No definition available.

+ Details

Name:	asrv_NumberOfDepositExceedingThresholdPercentageOfTotalDeposits
Namespace Prefix:	asrv_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Threshold percentage of total deposit liabilities.

+ References

No definition available.

+ Details

Name:	asrv_ThresholdPercentageOfTotalDeposits
Namespace Prefix:	asrv_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_DepositsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of deposits held by the entity for a related party (entity, shareholder, employee).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(k)(1))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480678/235-10-S99-1

+ Details

Name:	us-gaap_RelatedPartyDepositLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-SubTopic 405
-Topic 942
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478353/942-405-50-1

+ Details

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