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Allowance for Credit Losses - Loans - Additional information (Details) - USD ($)	3 Months Ended		12 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (Credit)	$ 301,000	$ (400,000)
Provision (credit) for credit losses	1,179,000	(400,000)
Net loan charge-offs	$ 116,000	$ 76,000
Percentage of charge-offs	0.05%	0.03%
Net unfavorable shift	$ 701,000
Percentage for Total Loans	1.24%		1.08%
Evaluated for impairment	$ 150,000
Percentage of coverage on non-performing assets	264.00%		207.00%
Percentage of general reserve	67.00%
Percentage of quantitative reserve	33.00%
Non-performing assets	$ 4,561,000
Non-performing
Accounts, Notes, Loans and Financing Receivable [Line Items]
Non-performing assets as a percent of loans	0.47%
Non-performing assets	$ 4,600,000		$ 5,200,000
Consumer and Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum aggregate balances for commercial loan relationship under structure loan rating process.	250,000
Pass
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	2,000,000
Special Mention
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	250,000
Substandard
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	250,000
Doubtful
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum individual loan balance requiring quarterly review	100,000
Commercial | Commercial.
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (Credit)		$ 252,000
Minimum aggregate balances for commercial loan relationship under structure loan rating process.	$ 1,000,000
Commercial | Commercial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum percent of portfolio to be reviewed	30.00%
Minimum aggregate balances for commercial loan relationship under structure loan rating process.	$ 1,000,000
Consumer. | Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision (Credit)	428,000	$ 11,000
Non-performing assets	$ 312,000

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

Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff net. Excludes net investment in lease.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

Financing Receivable, Minimum Percent Required To Be Reviewed.

+ References

No definition available.

+ Details

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X

- Definition

Threshold amount for evaluation of impairment of financing receivable.

+ References

No definition available.

+ Details

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

X

- Definition

Financing Receivable, Threshold Balance Which Requires Quarterly Reviews.

+ 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

The amount of net unfavorable shift.

+ References

No definition available.

+ Details

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

X

- Definition

This elements represents percentage of total loans.

+ References

No definition available.

+ Details

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Namespace Prefix:	asrv_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of allowance of credit loss on coverage of non performing assets on loan portfolio.

+ References

No definition available.

+ Details

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X

- Definition

Percentage of general reserve represented by qualitative adjustment.

+ References

No definition available.

+ Details

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- Definition

Percentage of general reserve represented by quantitative adjustment.

+ References

No definition available.

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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.

+ Details

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X

- Definition

Amount, excluding accrued interest, of credit loss expense (reversal of expense) on financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 13
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447

+ Details

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X

- Definition

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=d3e5111-111524

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (3)

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher SEC
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph (a)
-Subparagraph (2)

+ Details

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Period Type:	instant

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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X

- Definition

Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953423-111524

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-Publisher FASB
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-SubTopic 220
-Section S99
-Paragraph 1
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-URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585

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- Details

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