XML 53 R42.htm IDEA: XBRL DOCUMENT
v3.25.3

Note 4 - Loans, Allowance for Credit Losses and Other Real Estate Owned - Risk Category of Loans by Class (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Loans | $ 741,579,000 |  | $ 741,579,000 |  | $ 820,300,000
Nonaccrual | 2,347,000 |  | 2,347,000 |  | 201,000
Loans, Writeoff | 2,471,000 | $ 1,658,000 | 5,149,000 | $ 5,202,000 |
Financial Asset, Not Past Due [Member] |  |  |  |  |
Loans | 735,750,000 |  | 735,750,000 |  | 813,339,000
Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Loans | 2,463,000 |  | 2,463,000 |  | 5,314,000
Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Loans | 722,000 |  | 722,000 |  | 912,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Loans | 297,000 |  | 297,000 |  | 534,000
Pass [Member] |  |  |  |  |
Loans | 728,110,000 |  | 728,110,000 |  | 789,715,000
Substandard [Member] |  |  |  |  |
Loans | 11,597,000 |  | 11,597,000 |  | 29,867,000
Doubtful [Member] |  |  |  |  |
Loans | 1,492,000 |  | 1,492,000 |  | 192,000
Unlikely to be Collected Financing Receivable [Member] |  |  |  |  |
Loans | 380,000 |  | 380,000 |  | 526,000
Commercial Portfolio Segment [Member] |  |  |  |  |
Originated prior | 21,580,000 |  | 21,580,000 |  | 19,018,000
Originated four years before | 4,952,000 |  | 4,952,000 |  | 8,542,000
Originated three years before | 9,250,000 |  | 9,250,000 |  | 21,374,000
Originated two years before | 7,368,000 |  | 7,368,000 |  | 12,388,000
Originated one years before | 17,112,000 |  | 17,112,000 |  | 14,776,000
Originated current year | 29,365,000 |  | 29,365,000 |  | 19,399,000
Total Term Loans | 89,627,000 |  | 89,627,000 |  | 95,497,000
Financing Receivable Revolving | 24,213,000 |  | 24,213,000 |  | 31,779,000
Loans | 113,840,000 |  | 113,840,000 |  | 127,276,000
Nonaccrual | 1,429,000 |  | 1,429,000 |  | 10,000
Originated prior, writeoff | 0 |  | 0 |  | 59,000
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff | 1,559,000 |  | 1,559,000 |  | 0
Originated three years before, writeoff | 0 |  | 0 |  | 0
Originated two years before, writeoff | 0 |  | 5,000 |  | 0
Originated one years before, writeoff | 0 |  | 0 |  | 0
Originated current year, writeoff | 0 |  | 0 |  | 0
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff | 1,559,000 |  | 1,564,000 |  | 59,000
Financing Receivable Revolving, Writeoff | 0 |  | 33,000 |  | 224,000
Loans, Writeoff | 1,559,000 | 109,000 | 1,597,000 | 137,000 | 283,000
Commercial Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Loans | 112,164,000 |  | 112,164,000 |  | 126,538,000
Commercial Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Loans | 96,000 |  | 96,000 |  | 700,000
Commercial Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Loans | 151,000 |  | 151,000 |  | 28,000
Commercial Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Loans | 0 |  | 0 |  | 0
Commercial Portfolio Segment [Member] | Pass [Member] |  |  |  |  |
Originated prior | 21,365,000 |  | 21,365,000 |  | 18,752,000
Originated four years before | 4,952,000 |  | 4,952,000 |  | 8,542,000
Originated three years before | 9,250,000 |  | 9,250,000 |  | 18,539,000
Originated two years before | 7,368,000 |  | 7,368,000 |  | 12,388,000
Originated one years before | 17,112,000 |  | 17,112,000 |  | 14,776,000
Originated current year | 28,122,000 |  | 28,122,000 |  | 19,399,000
Total Term Loans | 88,169,000 |  | 88,169,000 |  | 92,396,000
Financing Receivable Revolving | 23,099,000 |  | 23,099,000 |  | 30,562,000
Loans | 111,268,000 |  | 111,268,000 |  | 122,958,000
Commercial Portfolio Segment [Member] | Substandard [Member] |  |  |  |  |
Originated prior | 215,000 |  | 215,000 |  | 266,000
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 2,835,000
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 515,000 |  | 515,000 |  | 0
Total Term Loans | 730,000 |  | 730,000 |  | 3,101,000
Financing Receivable Revolving | 414,000 |  | 414,000 |  | 1,217,000
Loans | 1,144,000 |  | 1,144,000 |  | 4,318,000
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |  |  |  |
Originated prior | 0 |  | 0 |  | 0
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 728,000 |  | 728,000 |  | 0
Total Term Loans | 728,000 |  | 728,000 |  | 0
Financing Receivable Revolving | 700,000 |  | 700,000 |  | 0
Loans | 1,428,000 |  | 1,428,000 |  | 0
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |  |
Originated prior | 0 |  | 0 |  | 0
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 0 |  | 0 |  | 0
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 0 |  | 0 |  | 0
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Originated prior | 228,383,000 |  | 228,383,000 |  | 214,569,000
Originated four years before | 56,562,000 |  | 56,562,000 |  | 66,353,000
Originated three years before | 47,828,000 |  | 47,828,000 |  | 63,697,000
Originated two years before | 41,358,000 |  | 41,358,000 |  | 49,117,000
Originated one years before | 69,894,000 |  | 69,894,000 |  | 43,091,000
Originated current year | 45,359,000 |  | 45,359,000 |  | 71,073,000
Total Term Loans | 489,384,000 |  | 489,384,000 |  | 507,900,000
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 489,384,000 |  | 489,384,000 |  | 507,900,000
Nonaccrual | 918,000 |  | 918,000 |  | 191,000
Originated prior, writeoff | 0 |  | 191,000 |  | 0
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff | 0 |  | 0 |  | 0
Originated three years before, writeoff | 0 |  | 0 |  | 0
Originated two years before, writeoff | 0 |  | 0 |  | 0
Originated one years before, writeoff | 0 |  | 0 |  | 0
Originated current year, writeoff | 0 |  | 0 |  | 0
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff | 0 |  | 191,000 |  | 0
Financing Receivable Revolving, Writeoff | 0 |  | 0 |  | 0
Loans, Writeoff | (0) | (0) | 191,000 | (0) | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Loans | 487,884,000 |  | 487,884,000 |  | 506,588,000
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Loans | 582,000 |  | 582,000 |  | 1,121,000
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Loans | 0 |  | 0 |  | 0
Commercial Real Estate Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Loans | 0 |  | 0 |  | 0
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |  |  |
Originated prior | 220,763,000 |  | 220,763,000 |  | 197,160,000
Originated four years before | 56,562,000 |  | 56,562,000 |  | 65,384,000
Originated three years before | 46,909,000 |  | 46,909,000 |  | 63,697,000
Originated two years before | 41,358,000 |  | 41,358,000 |  | 49,117,000
Originated one years before | 69,894,000 |  | 69,894,000 |  | 43,091,000
Originated current year | 45,189,000 |  | 45,189,000 |  | 71,073,000
Total Term Loans | 480,675,000 |  | 480,675,000 |  | 489,522,000
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 480,675,000 |  | 480,675,000 |  | 489,522,000
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |  |  |  |
Originated prior | 7,620,000 |  | 7,620,000 |  | 17,409,000
Originated four years before | 0 |  | 0 |  | 969,000
Originated three years before | 919,000 |  | 919,000 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 170,000 |  | 170,000 |  | 0
Total Term Loans | 8,709,000 |  | 8,709,000 |  | 18,378,000
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 8,709,000 |  | 8,709,000 |  | 18,378,000
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |  |  |  |
Originated prior | 0 |  | 0 |  | 0
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 0 |  | 0 |  | 0
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 0 |  | 0 |  | 0
Commercial Real Estate Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |  |
Originated prior | 0 |  | 0 |  | 0
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 0 |  | 0 |  | 0
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 0 |  | 0 |  | 0
Residential Portfolio Segment [Member] |  |  |  |  |
Originated prior | 7,517,000 |  | 7,517,000 |  | 8,274,000
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 7,517,000 |  | 7,517,000 |  | 8,274,000
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 7,517,000 |  | 7,517,000 |  | 8,274,000
Nonaccrual | 0 |  | 0 |  | 0
Originated prior, writeoff | 0 |  | 0 |  | 0
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff | 0 |  | 0 |  | 0
Originated three years before, writeoff | 0 |  | 0 |  | 0
Originated two years before, writeoff | 0 |  | 0 |  | 0
Originated one years before, writeoff | 0 |  | 0 |  | 0
Originated current year, writeoff | 0 |  | 0 |  | 0
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff | 0 |  | 0 |  | 0
Financing Receivable Revolving, Writeoff | 0 |  | 0 |  | 0
Loans, Writeoff | (0) | (0) | (0) | (0) | 0
Residential Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Loans | 7,517,000 |  | 7,517,000 |  | 8,274,000
Residential Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Loans | 0 |  | 0 |  | 0
Residential Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Loans | 0 |  | 0 |  | 0
Residential Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Loans | 0 |  | 0 |  | 0
Residential Portfolio Segment [Member] | Pass [Member] |  |  |  |  |
Originated prior | 7,312,000 |  | 7,312,000 |  | 7,984,000
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 7,312,000 |  | 7,312,000 |  | 7,984,000
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 7,312,000 |  | 7,312,000 |  | 7,984,000
Residential Portfolio Segment [Member] | Substandard [Member] |  |  |  |  |
Originated prior | 205,000 |  | 205,000 |  | 290,000
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 205,000 |  | 205,000 |  | 290,000
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 205,000 |  | 205,000 |  | 290,000
Residential Portfolio Segment [Member] | Doubtful [Member] |  |  |  |  |
Originated prior | 0 |  | 0 |  | 0
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 0 |  | 0 |  | 0
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 0 |  | 0 |  | 0
Residential Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |  |
Originated prior | 0 |  | 0 |  | 0
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 0 |  | 0 |  | 0
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 0 |  | 0 |  | 0
Construction Portfolio Segment [Member] |  |  |  |  |
Originated prior | 0 |  | 0 |  | 0
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 0 |  | 0 |  | 0
Financing Receivable Revolving | 0 |  | 0 |  | 5,064,000
Loans | 0 |  | 0 |  | 5,064,000
Nonaccrual | 0 |  | 0 |  | 0
Originated prior, writeoff | 0 |  | 0 |  | 0
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff | 0 |  | 0 |  | 0
Originated three years before, writeoff | 0 |  | 0 |  | 0
Originated two years before, writeoff | 0 |  | 0 |  | 0
Originated one years before, writeoff | 0 |  | 0 |  | 0
Originated current year, writeoff | 0 |  | 0 |  | 0
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff | 0 |  | 0 |  | 0
Financing Receivable Revolving, Writeoff | 0 |  | 0 |  | 0
Loans, Writeoff | (0) | (0) | (0) | (0) | 0
Construction Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Loans | 0 |  | 0 |  | 5,064,000
Construction Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Loans | 0 |  | 0 |  | 0
Construction Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Loans | 0 |  | 0 |  | 0
Construction Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Loans | 0 |  | 0 |  | 0
Construction Portfolio Segment [Member] | Pass [Member] |  |  |  |  |
Originated prior | 0 |  | 0 |  | 0
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 0 |  | 0 |  | 0
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 0 |  | 0 |  | 0
Construction Portfolio Segment [Member] | Substandard [Member] |  |  |  |  |
Originated prior | 0 |  | 0 |  | 0
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 0 |  | 0 |  | 0
Financing Receivable Revolving | 0 |  | 0 |  | 5,064,000
Loans | 0 |  | 0 |  | 5,064,000
Construction Portfolio Segment [Member] | Doubtful [Member] |  |  |  |  |
Originated prior | 0 |  | 0 |  | 0
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 0 |  | 0 |  | 0
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 0 |  | 0 |  | 0
Construction Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |  |
Originated prior | 0 |  | 0 |  | 0
Originated four years before | 0 |  | 0 |  | 0
Originated three years before | 0 |  | 0 |  | 0
Originated two years before | 0 |  | 0 |  | 0
Originated one years before | 0 |  | 0 |  | 0
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 0 |  | 0 |  | 0
Financing Receivable Revolving | 0 |  | 0 |  | 0
Loans | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] |  |  |  |  |
Originated prior | 8,530,000 |  | 8,530,000 |  | 6,274,000
Originated four years before | 22,096,000 |  | 22,096,000 |  | 12,739,000
Originated three years before | 35,592,000 |  | 35,592,000 |  | 33,870,000
Originated two years before | 20,104,000 |  | 20,104,000 |  | 50,542,000
Originated one years before | 19,061,000 |  | 19,061,000 |  | 27,430,000
Originated current year | 11,298,000 |  | 11,298,000 |  | 24,905,000
Total Term Loans | 116,681,000 |  | 116,681,000 |  | 155,760,000
Financing Receivable Revolving | 14,157,000 |  | 14,157,000 |  | 16,026,000
Loans | 130,838,000 |  | 130,838,000 |  | 171,786,000
Nonaccrual | 0 |  | 0 |  | 0
Originated prior, writeoff | 86,000 |  | 216,000 |  | 246,000
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff | 68,000 |  | 595,000 |  | 388,000
Originated three years before, writeoff | 334,000 |  | 1,228,000 |  | 2,376,000
Originated two years before, writeoff | 199,000 |  | 565,000 |  | 1,843,000
Originated one years before, writeoff | 161,000 |  | 612,000 |  | 913,000
Originated current year, writeoff | 5,000 |  | 5,000 |  | 162,000
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff | 853,000 |  | 3,221,000 |  | 5,928,000
Financing Receivable Revolving, Writeoff | 59,000 |  | 140,000 |  | 463,000
Loans, Writeoff | 912,000 | $ 1,549,000 | 3,361,000 | $ 5,065,000 | 6,391,000
Consumer Portfolio Segment [Member] | Term Loan Originated Prior [Member] |  |  |  |  |
Nonaccrual | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] | Term Loans Originated Four Years Prior [Member] |  |  |  |  |
Nonaccrual | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] | Term Loans Originated Three Years Prior [Member] |  |  |  |  |
Nonaccrual | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] | Term Loans Originated Two Years Prior [Member] |  |  |  |  |
Nonaccrual | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] | Term Loans Originated One Year Prior [Member] |  |  |  |  |
Nonaccrual | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] | Term Loans Originated Current Year [Member] |  |  |  |  |
Nonaccrual | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] | Total Term Loans [Member] |  |  |  |  |
Nonaccrual | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] | Revolving Loans Amortized Cost Basis [Member] |  |  |  |  |
Nonaccrual | 0 |  | 0 |  | 0
Consumer Portfolio Segment [Member] | Financial Asset, Not Past Due [Member] |  |  |  |  |
Originated prior | 8,266,000 |  | 8,266,000 |  | 6,068,000
Originated four years before | 21,397,000 |  | 21,397,000 |  | 12,464,000
Originated three years before | 34,756,000 |  | 34,756,000 |  | 32,608,000
Originated two years before | 19,757,000 |  | 19,757,000 |  | 48,694,000
Originated one years before | 18,764,000 |  | 18,764,000 |  | 26,805,000
Originated current year | 11,198,000 |  | 11,198,000 |  | 24,522,000
Total Term Loans | 114,138,000 |  | 114,138,000 |  | 151,161,000
Financing Receivable Revolving | 14,047,000 |  | 14,047,000 |  | 15,714,000
Loans | 128,185,000 |  | 128,185,000 |  | 166,875,000
Consumer Portfolio Segment [Member] | Financial Asset, 30 to 59 Days Past Due [Member] |  |  |  |  |
Originated prior | 202,000 |  | 202,000 |  | 173,000
Originated four years before | 534,000 |  | 534,000 |  | 201,000
Originated three years before | 553,000 |  | 553,000 |  | 949,000
Originated two years before | 247,000 |  | 247,000 |  | 1,392,000
Originated one years before | 105,000 |  | 105,000 |  | 385,000
Originated current year | 100,000 |  | 100,000 |  | 263,000
Total Term Loans | 1,741,000 |  | 1,741,000 |  | 3,363,000
Financing Receivable Revolving | 44,000 |  | 44,000 |  | 130,000
Loans | 1,785,000 |  | 1,785,000 |  | 3,493,000
Consumer Portfolio Segment [Member] | Financial Asset, 60 to 89 Days Past Due [Member] |  |  |  |  |
Originated prior | 29,000 |  | 29,000 |  | 33,000
Originated four years before | 90,000 |  | 90,000 |  | 36,000
Originated three years before | 181,000 |  | 181,000 |  | 184,000
Originated two years before | 100,000 |  | 100,000 |  | 256,000
Originated one years before | 156,000 |  | 156,000 |  | 91,000
Originated current year | 0 |  | 0 |  | 120,000
Total Term Loans | 556,000 |  | 556,000 |  | 720,000
Financing Receivable Revolving | 15,000 |  | 15,000 |  | 164,000
Loans | 571,000 |  | 571,000 |  | 884,000
Consumer Portfolio Segment [Member] | Financial Asset, Equal to or Greater than 90 Days Past Due [Member] |  |  |  |  |
Originated prior | 33,000 |  | 33,000 |  | 0
Originated four years before | 75,000 |  | 75,000 |  | 38,000
Originated three years before | 102,000 |  | 102,000 |  | 129,000
Originated two years before | 0 |  | 0 |  | 200,000
Originated one years before | 36,000 |  | 36,000 |  | 149,000
Originated current year | 0 |  | 0 |  | 0
Total Term Loans | 246,000 |  | 246,000 |  | 516,000
Financing Receivable Revolving | 51,000 |  | 51,000 |  | 18,000
Loans | 297,000 |  | 297,000 |  | 534,000
Consumer Portfolio Segment [Member] | Pass [Member] |  |  |  |  |
Loans | 128,855,000 |  | 128,855,000 |  | 169,251,000
Consumer Portfolio Segment [Member] | Substandard [Member] |  |  |  |  |
Loans | 1,539,000 |  | 1,539,000 |  | 1,817,000
Consumer Portfolio Segment [Member] | Doubtful [Member] |  |  |  |  |
Loans | 64,000 |  | 64,000 |  | 192,000
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |  |
Loans | $ 380,000 |  | $ 380,000 |  | $ 526,000

X
- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. 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 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestAllowanceForCreditLossWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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
- Definition Amortized cost excluding accrued interest, of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated more than five years before current fiscal year. 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 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestOriginatedMoreThanFiveYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable that can be withdrawn, repaid, and redrawn. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. 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 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated three years before current fiscal year. 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 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. 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 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated two years before current fiscal year. 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 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 3: 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 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. 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 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
Name: | us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of write off for financing receivable before allowance for credit loss and revolving loans. + References No definition available. + Details
Name: | wabc_FinancingReceivableBeforeAllowanceForCreditLossAndRevolvingLoansWriteoff
Namespace Prefix: | wabc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amortized cost of financing receivable that is a term loan. + References No definition available. + Details
Name: | wabc_FinancingReceivableTermLoan
Namespace Prefix: | wabc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InternalCreditAssessmentAxis=us-gaap_UnlikelyToBeCollectedFinancingReceivableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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=us-gaap_ResidentialPortfolioSegmentMember
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_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wabc_TermLoanOriginatedPriorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wabc_TermLoansOriginatedFourYearsPriorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wabc_TermLoansOriginatedThreeYearsPriorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wabc_TermLoansOriginatedTwoYearsPriorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wabc_TermLoansOriginatedOneYearPriorMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wabc_TermLoansOriginatedCurrentYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wabc_TotalTermLoansMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=wabc_RevolvingLoansAmortizedCostBasisMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |