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Note 10 - Commitments and Contingent Liabilities (Details Textual) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Loan Commitments, Not Unconditionally Cancellable	$ 25,555	$ 26,292
Unfunded Loan Commitments	184,043	171,672
Guarantor Obligations, Current Carrying Value	1,000	1,000
Other Liabilities [Member]
Reserve for Unfunded Commitments	201	201
Financial Standby Letter of Credit [Member]
Letters of Credit Outstanding, Amount	$ 917	$ 1,926

X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 460
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482425/460-10-50-4

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 55
-Paragraph 15
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477548/944-605-55-15

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 605
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477548/944-605-55-12

+ Details

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Balance Type:	credit
Period Type:	instant

X

- Definition

The portion of loan commitments that are not unconditionally cancellable.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of reserve for unfunded commitments.

+ References

No definition available.

+ Details

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

X

- Definition

Reflects the unfunded portion of contractual agreements to lend funds to borrowers.

+ References

No definition available.

+ Details

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

X

- Details

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Period Type:

X

- Details

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Namespace Prefix:
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