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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Investment securities available for sale, amortized cost	$ 1,728,199	$ 1,668,661
Investment securities available for sale, gross unrealized gains	965	512
Investment securities available for sale, gross unrealized losses	85,714	122,045
Securities AFS	1,643,450	1,547,128
US Treasury Securities [Member]
Investment securities available for sale, amortized cost	776,501	621,212
Investment securities available for sale, gross unrealized gains	342	250
Investment securities available for sale, gross unrealized losses	10	0
Securities AFS	776,833	621,462
US Government Corporations and Agencies Securities [Member]
Investment securities available for sale, amortized cost	6,928	9,226
Investment securities available for sale, gross unrealized gains	51	50
Investment securities available for sale, gross unrealized losses	119	127
Securities AFS	6,860	9,149
US Government-sponsored Enterprises Debt Securities [Member]
Investment securities available for sale, amortized cost	25,000
Investment securities available for sale, gross unrealized gains	5
Investment securities available for sale, gross unrealized losses	0
Securities AFS	25,005
Collateralized Mortgage-Backed Securities [Member]
Investment securities available for sale, amortized cost	726,456	797,145
Investment securities available for sale, gross unrealized gains	511	67
Investment securities available for sale, gross unrealized losses	81,392	113,196
Securities AFS	645,575	684,016
Collateralized Mortgage Obligations [Member]
Investment securities available for sale, amortized cost	25,171	27,747
Investment securities available for sale, gross unrealized gains	0	0
Investment securities available for sale, gross unrealized losses	1,869	3,191
Securities AFS	23,302	24,556
Corporate Debt Securities [Member]
Investment securities available for sale, amortized cost	168,143	213,331
Investment securities available for sale, gross unrealized gains	56	145
Investment securities available for sale, gross unrealized losses	2,324	5,531
Securities AFS	$ 165,875	$ 207,945

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

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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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- 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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- 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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