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Note 5 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized cost	$ 679,218	$ 700,528
Gross unrealized gains	1,043	58
Gross unrealized losses	(29,601)	(52,073)
Estimated fair value	650,660	648,513
US Treasury Securities [Member]
Amortized cost	156,916	176,483
Gross unrealized gains	363	8
Gross unrealized losses	(4,410)	(8,776)
Estimated fair value	152,869	167,715
US Government Agencies Debt Securities [Member]
Amortized cost	92,688	88,625
Gross unrealized gains	117	2
Gross unrealized losses	(2,872)	(5,194)
Estimated fair value	89,933	83,433
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Amortized cost	118,927	103,964
Gross unrealized gains	191	6
Gross unrealized losses	(8,636)	(12,920)
Estimated fair value	110,482	91,050
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	247,081	266,118
Gross unrealized gains	258	35
Gross unrealized losses	(11,054)	(20,591)
Estimated fair value	236,285	245,562
Corporate Debt Securities [Member]
Amortized cost	63,606	65,338
Gross unrealized gains	114	7
Gross unrealized losses	(2,629)	(4,592)
Estimated fair value	$ 61,091	$ 60,753

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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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

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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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