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Derivative Hedging Instruments (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 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	$ (16,813,329)	$ (5,000,000)
Derivative Instruments, Repricing Frequency	MONTHLY	MONTHLY
Derivative Instruments, increase (decrease) in interest expense	$ 23,543	$ 15,367
Derivative Instruments Weighted Average Interest Rate Received Paid	(3.88%)	(3.10%)
Derivative Financial Instruments, Assets [Member] | Swap [Member]
Derivative, Swap Type	FAIR VALUE	FAIR VALUE
Derivative, Notional Amount	$ 16,813,329	$ 5,000,000
Derivative Instruments, Repricing Frequency	MONTHLY	MONTHLY
Derivative Instruments, increase (decrease) in interest expense	$ (23,543)	$ (15,367)
Derivative Instruments Weighted Average Interest Rate Received Paid	3.88%	3.10%

X

- Definition

Description for repricing frequency of derivative instruments.

+ References

No definition available.

+ Details

Name:	asrv_DerivativeInstrumentsRepricingFrequency
Namespace Prefix:	asrv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- 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

X

- 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

X

- 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

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=us-gaap_DerivativeFinancialInstrumentsLiabilitiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_FairValueByAssetClassAxis=us-gaap_DerivativeFinancialInstrumentsAssetsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: