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v3.19.1

Allowance for Loan Losses (Details Textual) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Individual loan balance is classified as nonaccrual status or troubled debt restructure | $ 100,000 |  |
Debt Instrument Non Performing Assets | $ 1,200,000 |  |
Percentage for Total Loans | 0.14% |  |
Allowance for Loan and Lease Losses, Adjustments, Other | $ (400,000) | $ 50,000 |
Allowance for Loan and Lease Losses Write-offs, Net | $ 164,000 | $ 332,000 |
Allowance For Loan And Lease Losses Write Off Percentage | 0.08% | 0.15% |
Percentage Of Allowance For Non Performing Loans | 694.00% |  | 629.00%
Percentage Of Allowance For Total Loans | 0.94% |  | 1.00%
Commercial Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Threshold for individually evaluating loans | $ 1,000,000 |  |
Allowance for Loan and Lease Losses, Adjustments, Other | (448,000) | $ (160,000) |
Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Minimum individual loan balance requiring quarterly review | 2,000,000 |  |
Special Mention [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Threshold for individually evaluating loans | 250,000 |  |
Doubtful [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Minimum individual loan balance requiring quarterly review | $ 100,000 |  |
Minimum [Member] | Commercial Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Minimum percent of portfolio to be reviewed | 50.00% |  |
Maximum [Member] | Commercial Loan [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Minimum percent of portfolio to be reviewed | 55.00% |  |

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- Definition The percentage of after recoveries, of loans and leases that have been written-off. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Represents the value of non performing assets. + References No definition available. + Details
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Balance Type: | debit
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- Definition Financing Receivable, Minimum Percent Required To Be Reviewed. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Financing Receivable, Threshold Balance Which Requires Quarterly Reviews. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Financing Receivable, Allowance For Credit Losses, Threshold For Individually Evaluating Of Impairment. + References No definition available. + Details
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Period Type: | instant

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- Definition Individual loan balance is classified as nonaccrual status or troubled debt restructure. + References No definition available. + Details
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- Definition This elements represents percentage of total loans. + References No definition available. + Details
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Period Type: | duration

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- Definition The percentage of allowances on non performing loan losses. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition The percentage of allowances on total loan losses. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | num:percentItemType
Balance Type: | na
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
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- Definition Amount of other addition (reduction) in allowance reserve for credit loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5212-111524 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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- Definition Amount, after recoveries, of loans and leases that have been written-off. + References No definition available. + Details
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