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v3.23.1

Loans - Additional information (Details) - USD ($) | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Loans |  |
Real estate-construction loans, percentage | 3.20% | 4.70%
Loan balances net of unearned income | $ 321,000 | $ 343,000
Accrued interest receivable | $ 3,500,000 | $ 3,500,000

X
- Definition The amount of deferred income financing receivable excluding accrued interest. + References No definition available. + Details
Name: | asrv_FinancingReceivableExcludingAccruedInterestDeferredIncome
Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Real estate-construction loans, percentage. + References No definition available. + Details
Name: | asrv_RealEstateConstructionLoansPercentage
Namespace Prefix: | asrv_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of interest earned on loans but not received. Also called accrued interest or accrued interest receivable. + References No definition available. + Details
Name: | asrv_ReceivableAccruedInterest
Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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