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Subsequent Events Related to the COVID-19 Pandemic (Details) - PPP loan $ in Millions | May 04, 2020 USD ($) item | Mar. 27, 2020 USD ($) item
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Subsequent Event [Line Items] |  |
Number of times of average monthly payroll costs | item |  | 2.5
Loan amount |  | $ 10.0
Interest rate |  | 1.00%
Loan term |  | 2 years
Period for principal and interest payments deferred |  | 6 months
Percentage of guarantee by SBA |  | 100.00%
Percentage of loan proceeds used for payroll expenses |  | 75.00%
Percentage of loan proceeds used for other qualifying expenses |  | 25.00%
Subsequent event |  |
Subsequent Event [Line Items] |  |
Number of applications received | item | 400 |
Excess of loan application received | $ 61.0 |
Fee income generated from loans | $ 1.9 |

X
- Definition The amount of fee income from loans. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Represents the amount of excess loan application received. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents the interest rate on loans receivable. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the term on loans receivable. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of applications received. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of guarantee by SBA. + References No definition available. + Details
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Namespace Prefix: | asrv_
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Balance Type: | na
Period Type: | duration

X
- Definition Represents the percentage of loan proceeds used for other qualifying expenses. + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the percentage of loan proceeds used for payroll expenses. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the period for principal and interest payments deferred. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the number of times of average monthly payroll costs. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, after fee received for commitment to originate or purchase, of financing receivable. Excludes financing receivable covered under loss sharing agreement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919230-210447 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118936363&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 80 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922355-210448 + Details
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Balance Type: | debit
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X
- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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- Details
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- Details
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