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Note 3 - Investment Securities Available for Sale - Amortized Cost and Estimated Fair Value of Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Investment securities available for sale, amortized cost	$ 508,097	$ 473,433
Investment securities available for sale, gross unrealized gains	4,155	530
Investment securities available for sale, gross unrealized losses	(27,566)	(36,228)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	484,686	437,735
Residential Mortgage Backed Securities Issued by US Government Sponsored Enterprises [Member]
Investment securities available for sale, amortized cost	258,397	243,709
Investment securities available for sale, gross unrealized gains	2,216	138
Investment securities available for sale, gross unrealized losses	(9,748)	(15,456)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	250,865	228,391
Commercial Mortgage Backed Securities Issued by US Government Agencies [Member]
Investment securities available for sale, amortized cost	147,614	133,749
Investment securities available for sale, gross unrealized gains	1,253	77
Investment securities available for sale, gross unrealized losses	(9,929)	(11,956)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	138,938	121,870
US States and Political Subdivisions Debt Securities [Member]
Investment securities available for sale, amortized cost	102,086	95,975
Investment securities available for sale, gross unrealized gains	686	315
Investment securities available for sale, gross unrealized losses	(7,889)	(8,816)
Debt Securities, Available-for-Sale, Excluding Accrued Interest	$ 94,883	$ 87,474

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

+ Details

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

X

- Definition

Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 320
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481800/320-10-50-2

+ Details

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Period Type:	instant

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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X

- Definition

Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 30
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479130/326-30-45-1

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
Data Type:	na
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