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DEPOSITS - Additional information (Details) | Dec. 31, 2024 USD ($) item | Dec. 31, 2023 USD ($)
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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

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- 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

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- Definition Number of deposits exceeding the threshold percentage of total deposits. + References No definition available. + Details
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Data Type: | xbrli:integerItemType
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Period Type: | instant

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- Definition Threshold percentage of total deposit liabilities. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- 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
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- 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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