Note 4 - Loans, Allowance for Credit Losses and Other Real Estate Owned - Risk Category of Loans by Class (Details) - USD ($)	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Loans	$ 748,264,000		$ 748,264,000		$ 820,300,000
Nonaccrual	4,553,000		4,553,000		201,000
Loans, Writeoff	952,000	$ 1,541,000	2,678,000	$ 3,544,000
Financial Asset, Not Past Due [Member]
Loans	739,014,000		739,014,000		813,339,000
Financial Asset, 30 to 59 Days Past Due [Member]
Loans	3,759,000		3,759,000		5,314,000
Financial Asset, 60 to 89 Days Past Due [Member]
Loans	527,000		527,000		912,000
Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Loans	411,000		411,000		534,000
Pass [Member]
Loans	730,198,000		730,198,000		789,715,000
Substandard [Member]
Loans	14,051,000		14,051,000		29,867,000
Doubtful [Member]
Loans	3,694,000		3,694,000		192,000
Unlikely to be Collected Financing Receivable [Member]
Loans	321,000		321,000		526,000
Commercial Portfolio Segment [Member]
Originated prior	23,708,000		23,708,000		19,018,000
Originated four years before	8,644,000		8,644,000		8,542,000
Originated three years before	10,364,000		10,364,000		21,374,000
Originated two years before	7,945,000		7,945,000		12,388,000
Originated one years before	17,765,000		17,765,000		14,776,000
Originated current year	22,371,000		22,371,000		19,399,000
Total Term Loans	90,797,000		90,797,000		95,497,000
Financing Receivable Revolving	20,363,000		20,363,000		31,779,000
Loans	111,160,000		111,160,000		127,276,000
Nonaccrual	3,635,000		3,635,000		10,000
Originated prior, writeoff	0		0		59,000
Originated four years before, writeoff	0		0		0
Originated three years before, writeoff	0		0		0
Originated two years before, writeoff	5,000		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	5,000		5,000		59,000
Financing Receivable Revolving, Writeoff	23,000		33,000		224,000
Loans, Writeoff	28,000	28,000	38,000	28,000	283,000
Commercial Portfolio Segment [Member] \| Financial Asset, Not Past Due [Member]
Loans	107,035,000		107,035,000		126,538,000
Commercial Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans	440,000		440,000		700,000
Commercial Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Loans	50,000		50,000		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	23,468,000		23,468,000		18,752,000
Originated four years before	5,809,000		5,809,000		8,542,000
Originated three years before	10,364,000		10,364,000		18,539,000
Originated two years before	7,945,000		7,945,000		12,388,000
Originated one years before	17,765,000		17,765,000		14,776,000
Originated current year	21,724,000		21,724,000		19,399,000
Total Term Loans	87,075,000		87,075,000		92,396,000
Financing Receivable Revolving	19,263,000		19,263,000		30,562,000
Loans	106,338,000		106,338,000		122,958,000
Commercial Portfolio Segment [Member] \| Substandard [Member]
Originated prior	240,000		240,000		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	647,000		647,000		0
Total Term Loans	887,000		887,000		3,101,000
Financing Receivable Revolving	300,000		300,000		1,217,000
Loans	1,187,000		1,187,000		4,318,000
Commercial Portfolio Segment [Member] \| Doubtful [Member]
Originated prior	0		0		0
Originated four years before	2,835,000		2,835,000		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	2,835,000		2,835,000		0
Financing Receivable Revolving	800,000		800,000		0
Loans	3,635,000		3,635,000		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	250,676,000		250,676,000		214,569,000
Originated four years before	57,699,000		57,699,000		66,353,000
Originated three years before	48,244,000		48,244,000		63,697,000
Originated two years before	41,627,000		41,627,000		49,117,000
Originated one years before	70,283,000		70,283,000		43,091,000
Originated current year	17,934,000		17,934,000		71,073,000
Total Term Loans	486,463,000		486,463,000		507,900,000
Financing Receivable Revolving	0		0		0
Loans	486,463,000		486,463,000		507,900,000
Nonaccrual	918,000		918,000		191,000
Originated prior, writeoff	0		191,000		0
Originated four years before, 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	484,829,000		484,829,000		506,588,000
Commercial Real Estate Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Loans	716,000		716,000		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	240,659,000		240,659,000		197,160,000
Originated four years before	57,699,000		57,699,000		65,384,000
Originated three years before	47,326,000		47,326,000		63,697,000
Originated two years before	41,627,000		41,627,000		49,117,000
Originated one years before	70,283,000		70,283,000		43,091,000
Originated current year	17,934,000		17,934,000		71,073,000
Total Term Loans	475,528,000		475,528,000		489,522,000
Financing Receivable Revolving	0		0		0
Loans	475,528,000		475,528,000		489,522,000
Commercial Real Estate Portfolio Segment [Member] \| Substandard [Member]
Originated prior	10,017,000		10,017,000		17,409,000
Originated four years before	0		0		969,000
Originated three years before	918,000		918,000		0
Originated two years before	0		0		0
Originated one years before	0		0		0
Originated current year	0		0		0
Total Term Loans	10,935,000		10,935,000		18,378,000
Financing Receivable Revolving	0		0		0
Loans	10,935,000		10,935,000		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	7,709,000		7,709,000		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	7,709,000		7,709,000		8,274,000
Financing Receivable Revolving	0		0		0
Loans	7,709,000		7,709,000		8,274,000
Nonaccrual	0		0		0
Originated prior, writeoff	0		0		0
Originated four years before, 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	7,709,000		7,709,000		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	7,501,000		7,501,000		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	7,501,000		7,501,000		7,984,000
Financing Receivable Revolving	0		0		0
Loans	7,501,000		7,501,000		7,984,000
Residential Portfolio Segment [Member] \| Substandard [Member]
Originated prior	208,000		208,000		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	208,000		208,000		290,000
Financing Receivable Revolving	0		0		0
Loans	208,000		208,000		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
Originated four years before, 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	11,478,000		11,478,000		6,274,000
Originated four years before	25,730,000		25,730,000		12,739,000
Originated three years before	40,050,000		40,050,000		33,870,000
Originated two years before	22,509,000		22,509,000		50,542,000
Originated one years before	20,905,000		20,905,000		27,430,000
Originated current year	7,735,000		7,735,000		24,905,000
Total Term Loans	128,407,000		128,407,000		155,760,000
Financing Receivable Revolving	14,525,000		14,525,000		16,026,000
Loans	142,932,000		142,932,000		171,786,000
Nonaccrual	0		0		0
Originated prior, writeoff	75,000		130,000		246,000
Originated four years before, writeoff	127,000		527,000		388,000
Originated three years before, writeoff	349,000		894,000		2,376,000
Originated two years before, writeoff	99,000		366,000		1,843,000
Originated one years before, writeoff	248,000		451,000		913,000
Originated current year, writeoff	0		0		162,000
Financing Receivable, before Allowance for Credit Loss and Revolving Loans, Writeoff	898,000		2,368,000		5,928,000
Financing Receivable Revolving, Writeoff	26,000		81,000		463,000
Loans, Writeoff	924,000	$ 1,513,000	2,449,000	$ 3,516,000	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	11,121,000		11,121,000		6,068,000
Originated four years before	24,912,000		24,912,000		12,464,000
Originated three years before	38,896,000		38,896,000		32,608,000
Originated two years before	22,083,000		22,083,000		48,694,000
Originated one years before	20,514,000		20,514,000		26,805,000
Originated current year	7,667,000		7,667,000		24,522,000
Total Term Loans	125,193,000		125,193,000		151,161,000
Financing Receivable Revolving	14,248,000		14,248,000		15,714,000
Loans	139,441,000		139,441,000		166,875,000
Consumer Portfolio Segment [Member] \| Financial Asset, 30 to 59 Days Past Due [Member]
Originated prior	270,000		270,000		173,000
Originated four years before	701,000		701,000		201,000
Originated three years before	903,000		903,000		949,000
Originated two years before	327,000		327,000		1,392,000
Originated one years before	224,000		224,000		385,000
Originated current year	63,000		63,000		263,000
Total Term Loans	2,488,000		2,488,000		3,363,000
Financing Receivable Revolving	115,000		115,000		130,000
Loans	2,603,000		2,603,000		3,493,000
Consumer Portfolio Segment [Member] \| Financial Asset, 60 to 89 Days Past Due [Member]
Originated prior	56,000		56,000		33,000
Originated four years before	101,000		101,000		36,000
Originated three years before	119,000		119,000		184,000
Originated two years before	65,000		65,000		256,000
Originated one years before	84,000		84,000		91,000
Originated current year	0		0		120,000
Total Term Loans	425,000		425,000		720,000
Financing Receivable Revolving	52,000		52,000		164,000
Loans	477,000		477,000		884,000
Consumer Portfolio Segment [Member] \| Financial Asset, Equal to or Greater than 90 Days Past Due [Member]
Originated prior	31,000		31,000		0
Originated four years before	16,000		16,000		38,000
Originated three years before	132,000		132,000		129,000
Originated two years before	34,000		34,000		200,000
Originated one years before	83,000		83,000		149,000
Originated current year	5,000		5,000		0
Total Term Loans	301,000		301,000		516,000
Financing Receivable Revolving	110,000		110,000		18,000
Loans	411,000		411,000		534,000
Consumer Portfolio Segment [Member] \| Pass [Member]
Loans	140,831,000		140,831,000		169,251,000
Consumer Portfolio Segment [Member] \| Substandard [Member]
Loans	1,721,000		1,721,000		1,817,000
Consumer Portfolio Segment [Member] \| Doubtful [Member]
Loans	59,000		59,000		192,000
Consumer Portfolio Segment [Member] \| Unlikely to be Collected Financing Receivable [Member]
Loans	$ 321,000		$ 321,000		$ 526,000

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

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

- 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

- 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

- 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

- 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

- Definition

Amortized cost excluding accrued interest, of financing receivable that can be withdrawn, repaid, and redrawn.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestRevolving
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable that can be withdrawn, repaid, and redrawn.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestRevolvingWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amortized cost excluding accrued interest, of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated four years before current fiscal year. Excludes net investment in lease.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearFiveOriginatedFourYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amortized cost excluding accrued interest, of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated three years before current fiscal year. Excludes net investment in lease.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearFourOriginatedThreeYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amortized cost excluding accrued interest, of financing receivable originated in current fiscal year. Excludes net investment in lease.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated in current fiscal year. Excludes net investment in lease.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearOneOriginatedCurrentFiscalYearWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amortized cost excluding accrued interest, of financing receivable originated two years prior to current fiscal year. Excludes net investment in lease.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated two years before current fiscal year. Excludes net investment in lease.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearThreeOriginatedTwoYearsBeforeCurrentFiscalYearWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amortized cost excluding accrued interest of financing receivable originated in fiscal year prior to current fiscal year. Excludes net investment in lease.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, excluding accrued interest, of writeoff of financing receivable originated in fiscal year before current fiscal year. Excludes net investment in lease.

+ References

+ Details

Name:	us-gaap_FinancingReceivableExcludingAccruedInterestYearTwoOriginatedFiscalYearBeforeCurrentFiscalYearWriteoff
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- 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

- 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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

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