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Note 5 - Debt Securities - Securities Available-for-sale (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Amortized cost	$ 679,696	$ 700,528
Gross unrealized gains	589	58
Gross unrealized losses	(35,583)	(52,073)
Estimated fair value	644,702	648,513
US Treasury Securities [Member]
Amortized cost	163,946	176,483
Gross unrealized gains	253	8
Gross unrealized losses	(5,532)	(8,776)
Estimated fair value	158,667	167,715
US Government Agencies Debt Securities [Member]
Amortized cost	88,726	88,625
Gross unrealized gains	87	2
Gross unrealized losses	(3,303)	(5,194)
Estimated fair value	85,510	83,433
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Amortized cost	113,399	103,964
Gross unrealized gains	51	6
Gross unrealized losses	(9,790)	(12,920)
Estimated fair value	103,660	91,050
US States and Political Subdivisions Debt Securities [Member]
Amortized cost	249,344	266,118
Gross unrealized gains	138	35
Gross unrealized losses	(13,844)	(20,591)
Estimated fair value	235,638	245,562
Corporate Debt Securities [Member]
Amortized cost	64,281	65,338
Gross unrealized gains	60	7
Gross unrealized losses	(3,114)	(4,592)
Estimated fair value	$ 61,227	$ 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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