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Allowance for Loan Losses (Details Textual) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 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		$ 100,000
Debt Instrument Non Performing Assets			$ 1,700,000
Percentage for Total Loans			0.19%
Allowance for Loan and Lease Losses, Adjustments, Other	$ 0	$ 50,000	$ (400,000)	$ 100,000
Allowance for Loan and Lease Losses Write-offs, Net			$ 169,000	$ 793,000
Allowance For Loan And Lease Losses Write Off Percentage			0.04%	0.18%
Percentage Of Allowance For Non Performing Assets	482.00%		482.00%		629.00%
Percentage Of Allowance For Total Loans	0.91%		0.91%		1.00%
Commercial Loan [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring annual credit review	$ 1,000,000		$ 1,000,000
Allowance for Loan and Lease Losses, Adjustments, Other	(76,000)	$ (10,000)	(524,000)	$ (170,000)
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	2,000,000		2,000,000
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	100,000		100,000
Special Mention or Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	$ 250,000		$ 250,000
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%

X

- 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

X

- Definition

Represents the value of non performing assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Financing Receivable, Minimum Percent Required To Be Reviewed.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
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Balance Type:	na
Period Type:	duration

X

- Definition

Financing Receivable Threshold Balance Mandating Annual Credit Reviews

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Financing Receivable, Threshold Balance Which Requires Quarterly Reviews.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

Individual loan balance is classified as nonaccrual status or troubled debt restructure.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This elements represents percentage of total loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of allowances for non performing assets.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
Data Type:	num:percentItemType
Balance Type:	na
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X

- Definition

The percentage of allowances on total loan losses.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
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Balance Type:	na
Period Type:	instant

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- 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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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount, after recoveries, of loans and leases that have been written-off.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Details

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- Details

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