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Revenue Recognition - Additional information (Details) | 6 Months Ended
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Jun. 30, 2025 USD ($)
Percentage of entity revenue | 83.50%
Other assets |
Wealth management fees receivable | $ 850,000

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- Definition Represents the percentage of entity revenue. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition For an unclassified balance sheet, the amount of fees and other revenue, excluding investment income receivable, earned but not yet received, which were recognized in conformity with revenue recognition criteria based on estimates or specific contractual terms. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)(a)(4)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_AccruedFeesAndOtherRevenueReceivable
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | us-gaap_BalanceSheetLocationAxis=us-gaap_OtherAssetsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |