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Allowance for Loan Losses - Additional information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 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			$ 2,000,000
Percentage Of Allowance For Total Loans	0.95%		0.95%		1.00%
Non-performing assets as a percent of loans	0.22%		0.22%		0.16%
Allowance for Loan and Lease Losses, Adjustments, Other	$ 225,000	$ 0	$ (175,000)	$ 100,000
Allowance for Loan and Lease Losses Write-offs, Net			$ 151,000	$ 875,000
Allowance For Loan And Lease Losses Write Off Percentage			0.02%	0.13%
Percentage Of Allowance For Non Performing Assets	426.00%		426.00%		629.00%
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum aggregate balances for commercial loan relationship under structure loan rating process	$ 1,000,000		$ 1,000,000
Allowance for Loan and Lease Losses, Adjustments, Other	464,000	$ 175,000	(60,000)	$ 5,000
Pass [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	2,000,000		2,000,000
Special Mention [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	250,000		250,000
Substandard [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	250,000		250,000
Doubtful [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	$ 100,000		$ 100,000
Minimum | Commercial Portfolio Segment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum percent of portfolio to be reviewed			50.00%
Maximum | Commercial Portfolio Segment [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_
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Balance Type:	na
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X

- Definition

Represents the value of non performing assets.

+ References

No definition available.

+ Details

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X

- Definition

Financing Receivable, Minimum Percent Required To Be Reviewed.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

X

- Definition

Financing Receivable, Threshold Balance Which Requires Quarterly Reviews.

+ References

No definition available.

+ Details

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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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X

- Definition

Amount of minimum aggregate balances for commercial loan relationship under structure loan rating process.

+ References

No definition available.

+ Details

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X

- Definition

N/A

+ References

No definition available.

+ Details

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X

- Definition

N/A

+ References

No definition available.

+ Details

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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.

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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=118936363&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

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X

- Definition

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

+ References

No definition available.

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X

- Definition

Reflects the percentage derived from dividing impaired loans on which interest has ceased to be accrued by total loans.

+ References

No definition available.

+ Details

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- Details

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