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Note 2 - Investment Securities - Available-for-sale Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Securities available-for-sale, amortized cost	$ 825,358	$ 1,114,961
Securities available-for-sale, unrealized gains	296	144
Securities available-for-sale, unrealized losses	(88,134)	(124,991)
Securities available-for-sale, fair value	737,520	990,114
US Government-sponsored Enterprises Debt Securities [Member]
Securities available-for-sale, amortized cost	77,669	88,895
Securities available-for-sale, unrealized gains	105	110
Securities available-for-sale, unrealized losses	(3,088)	(4,847)
Securities available-for-sale, fair value	74,686	84,158
Mortgage-Backed Security, Issued by US Government-Sponsored Enterprise [Member]
Securities available-for-sale, amortized cost	622,953	696,767
Securities available-for-sale, unrealized gains	181	0
Securities available-for-sale, unrealized losses	(74,850)	(105,790)
Securities available-for-sale, fair value	548,284	590,977
US States and Political Subdivisions Debt Securities [Member]
Securities available-for-sale, amortized cost	124,141	128,431
Securities available-for-sale, unrealized gains	10	1
Securities available-for-sale, unrealized losses	(10,154)	(14,198)
Securities available-for-sale, fair value	113,997	114,234
Other Debt Obligations [Member]
Securities available-for-sale, amortized cost	595	2,686
Securities available-for-sale, unrealized gains	0	0
Securities available-for-sale, unrealized losses	(42)	(156)
Securities available-for-sale, fair value	$ 553	2,530
US Treasury Securities and US Government Agencies Debt Securities [Member]
Securities available-for-sale, amortized cost		198,182
Securities available-for-sale, unrealized gains		33
Securities available-for-sale, unrealized losses		0
Securities available-for-sale, fair value		$ 198,215

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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