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NON-PERFORMING ASSETS INCLUDING TROUBLED DEBT RESTRUCTURINGS (TDR) - concentration of COVID-19 related modifications within the loan portfolio (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Modifications [Line Items] |  |
Loans For Which Payment Relief Has Been Requested | $ 231 | $ 7,748
% of Outstanding Non-PPP Loans | 0.02% | 0.80%
Commercial loans secured by Non-Owner Occupied real estate [Member] | Commercial |  |
Financing Receivable, Modifications [Line Items] |  |
Loans For Which Payment Relief Has Been Requested | $ 199 | $ 7,488
% of Outstanding Non-PPP Loans | 0.03% | 1.08%
Home Equity | Consumer. |  |
Financing Receivable, Modifications [Line Items] |  |
Loans For Which Payment Relief Has Been Requested |  | $ 57
% of Outstanding Non-PPP Loans |  | 0.06%
Real estate - residential mortgage |  |
Financing Receivable, Modifications [Line Items] |  |
Loans For Which Payment Relief Has Been Requested | $ 32 | $ 203
% of Outstanding Non-PPP Loans | 0.02% | 0.11%

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

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- Definition Represents percentage of outstanding non PPP loans for which payment relief has been requested. + 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 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |