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DERIVATIVE HEDGING INSTRUMENTS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 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	$ (31,668)	$ (19,825)
Derivative Instruments Weighted Average Interest Rate Received Paid	(4.44%)	(4.31%)
Derivative Instruments, Repricing Frequency	Monthly	Monthly
Increase (Decrease) in Interest Expense	$ 18,000	$ 41,000
Derivative Financial Instruments, Assets [Member] | Swap [Member]
Derivative, Swap Type	Fair Value	Fair Value
Derivative Asset, Notional Amount	$ 31,668	$ 19,825
Derivative Instruments Weighted Average Interest Rate Received Paid	4.44%	4.31%
Derivative Instruments, Repricing Frequency	Monthly	Monthly
Increase (Decrease) in Interest Expense	$ (18,000)	$ (41,000)

X

- Definition

Description for repricing frequency of derivative instruments.

+ References

No definition available.

+ Details

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Balance Type:	na
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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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Namespace Prefix:	asrv_
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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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- 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

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X

- 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

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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

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X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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- Details

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- Details

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- Details

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