XML 52 R41.htm IDEA: XBRL DOCUMENT
v3.25.2

Note 4 - Loans, Allowance for Credit Losses and Other Real Estate Owned - Loans by Delinquency and Nonaccrual Status (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Loans | $ 748,264 | $ 820,300
Nonaccrual | 4,553 | 201
Commercial Portfolio Segment [Member] |  |
Loans | 111,160 | 127,276
Nonaccrual | 3,635 | 10
Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 486,463 | 507,900
Nonaccrual | 918 | 191
Construction Portfolio Segment [Member] |  |
Loans | 0 | 5,064
Nonaccrual | 0 | 0
Residential Portfolio Segment [Member] |  |
Loans | 7,709 | 8,274
Nonaccrual | 0 | 0
Consumer Portfolio Segment [Member] |  |
Loans | 142,932 | 171,786
Nonaccrual | 0 | 0
Financial Asset, Not Past Due [Member] |  |
Loans | 739,014 | 813,339
Financial Asset, Not Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 107,035 | 126,538
Financial Asset, Not Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 484,829 | 506,588
Financial Asset, Not Past Due [Member] | Construction Portfolio Segment [Member] |  |
Loans | 0 | 5,064
Financial Asset, Not Past Due [Member] | Residential Portfolio Segment [Member] |  |
Loans | 7,709 | 8,274
Financial Asset, Not Past Due [Member] | Consumer Portfolio Segment [Member] |  |
Loans | 139,441 | 166,875
Financial Asset, 30 to 59 Days Past Due [Member] |  |
Loans | 3,759 | 5,314
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 440 | 700
Financial Asset, 30 to 59 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 716 | 1,121
Financial Asset, 30 to 59 Days Past Due [Member] | Construction Portfolio Segment [Member] |  |
Loans | 0 | 0
Financial Asset, 30 to 59 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |
Loans | 0 | 0
Financial Asset, 30 to 59 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |
Loans | 2,603 | 3,493
Financial Asset, 60 to 89 Days Past Due [Member] |  |
Loans | 527 | 912
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 50 | 28
Financial Asset, 60 to 89 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 0 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Construction Portfolio Segment [Member] |  |
Loans | 0 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |
Loans | 0 | 0
Financial Asset, 60 to 89 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |
Loans | 477 | 884
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |
Loans | 411 | 534
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] |  |
Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Commercial Real Estate Portfolio Segment [Member] |  |
Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Construction Portfolio Segment [Member] |  |
Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Residential Portfolio Segment [Member] |  |
Loans | 0 | 0
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] | Consumer Portfolio Segment [Member] |  |
Loans | $ 411 | $ 534

X
- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestBeforeAllowanceForCreditLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost excluding accrued interest, of financing receivable on nonaccrual status. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 16 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-16 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestNonaccrual
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialRealEstatePortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=wabc_ConstructionPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancialAssetNotPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables30To59DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivables60To89DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablesPeriodPastDueAxis=us-gaap_FinancingReceivablesEqualToGreaterThan90DaysPastDueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |