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v3.10.0.1

Derivative Hedging Instruments (Details) - USD ($) | 6 Months Ended
--- | ---
Jun. 30, 2018 | Jun. 30, 2017
Derivative, Notional Amount | $ 0 | $ 0
Derivative Instruments, increase (decrease) in interest expense | $ 0 | $ 0
Derivative Instruments Weighted Average Interest Rate Received Paid | 0.00% | 0.00%
Derivative Financial Instruments, Liabilities [Member] | Swap [Member] |  |
Derivative, Swap Type | FAIR VALUE | FAIR VALUE
Derivative, Notional Amount | $ (16,680,569) | $ (10,998,027)
Derivative Instruments, Repricing Frequency | MONTHLY | MONTHLY
Derivative Instruments, increase (decrease) in interest expense | $ 33,446 | $ 42,160
Derivative Instruments Weighted Average Interest Rate Received Paid | (4.04%) | (3.22%)
Derivative Financial Instruments, Assets [Member] | Swap [Member] |  |
Derivative, Swap Type | FAIR VALUE | FAIR VALUE
Derivative, Notional Amount | $ 16,680,569 | $ 10,998,027
Derivative Instruments, Repricing Frequency | MONTHLY | MONTHLY
Derivative Instruments, increase (decrease) in interest expense | $ (33,446) | $ (42,160)
Derivative Instruments Weighted Average Interest Rate Received Paid | 4.04% | 3.22%

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- Definition Description for repricing frequency of derivative instruments. + References No definition available. + Details
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Namespace Prefix: | asrv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The percentage of interest received(Paid) during the period under Interest Rate swap transaction. + References No definition available. + Details
Name: | asrv_DerivativeInstrumentsWeightedAverageInterestRateReceivedPaid
Namespace Prefix: | asrv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition This amount represents the increase (decrease) in interest expense (not fair value) of interest rate swaps. + References No definition available. + Details
Name: | asrv_IncreaseDecreaseInInterestExpense
Namespace Prefix: | asrv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
Name: | invest_DerivativeNotionalAmount
Namespace Prefix: | invest_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | instant

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- Definition Indicates whether the entity pays a variable or fixed price on a price risk swap. + References No definition available. + Details
Name: | us-gaap_DerivativeSwapType
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
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Period Type: |

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- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_SwapMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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