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NON-PERFORMING ASSETS INCLUDING TROUBLED DEBT RESTRUCTURINGS - types of payment relief that have been granted (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($) loan
Financing Receivable, Modifications [Line Items] |  |
Loans For Which Payment Relief Has Been Requested | $ 7,748 | $ 49,063
Interest only payments |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans | loan | 6 | 11
Loans For Which Payment Relief Has Been Requested | $ 3,768 | $ 26,900
Complete payment deferrals |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans | loan | 5 | 59
Loans For Which Payment Relief Has Been Requested | $ 3,980 | $ 22,163
Maturity date extensions |  |
Financing Receivable, Modifications [Line Items] |  |
Number of loans | loan | 11 | 70
Loans For Which Payment Relief Has Been Requested | $ 7,748 | $ 49,063

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- Definition Number of financing receivables that have been modified in response to COVID-19. + References No definition available. + Details
Name: | asrv_FinancingReceivableModificationsFromCovid19NumberOfContracts
Namespace Prefix: | asrv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the amount of loans for which payment relief has been requested. + References No definition available. + Details
Name: | asrv_LoansForWhichPaymentReliefHasBeenRequested
Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

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- Details
Name: | us-gaap_LoanRestructuringModificationAxis=asrv_InterestPaymentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_PaymentDeferralMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LoanRestructuringModificationAxis=us-gaap_ExtendedMaturityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |