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Derivative Hedging Instruments (Details) - USD ($) $ in Thousands | 9 Months Ended
--- | ---
Sep. 30, 2019 | Sep. 30, 2018
Derivative, Notional Amount | $ 0 | $ 0
Derivative Instruments Weighted Average Interest Rate Received Paid | 0.00% | 0.00%
Increase (Decrease) in Interest Expense | $ 0 | $ 0
Derivative Financial Instruments, Liabilities [Member] | Swap [Member] |  |
Derivative, Swap Type | FAIR VALUE | FAIR VALUE
Derivative Liability, Notional Amount | $ (23,866) | $ (19,983)
Derivative Instruments Weighted Average Interest Rate Received Paid | (4.69%) | (4.20%)
Derivative Instruments, Repricing Frequency | MONTHLY | MONTHLY
Increase (Decrease) in Interest Expense | $ (11) | $ 42
Derivative Financial Instruments, Assets [Member] | Swap [Member] |  |
Derivative, Swap Type | FAIR VALUE | FAIR VALUE
Derivative Asset, Notional Amount | $ 23,866 | $ 19,983
Derivative Instruments Weighted Average Interest Rate Received Paid | 4.69% | 4.20%
Derivative Instruments, Repricing Frequency | MONTHLY | MONTHLY
Increase (Decrease) in Interest Expense | $ 11 | $ (42)

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- Definition Description for repricing frequency of derivative instruments. + References No definition available. + Details
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- Definition The percentage of interest received(Paid) during the period under Interest Rate swap transaction. + References No definition available. + Details
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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
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Namespace Prefix: | asrv_
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Balance Type: | credit
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- Definition Nominal or face amount used to calculate payments on the derivative asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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- Definition Nominal or face amount used to calculate payments on the derivative liability. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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- Definition Nominal or face amount used to calculate payment on derivative. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 + Details
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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
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- Details
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- Details
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- Details
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