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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Investment securities available for sale, amortized cost	$ 1,746,703	$ 1,668,661
Investment securities available for sale, gross unrealized gains	249	512
Investment securities available for sale, gross unrealized losses	98,519	122,045
Securities AFS	1,648,433	1,547,128
US Treasury Securities [Member]
Investment securities available for sale, amortized cost	768,375	621,212
Investment securities available for sale, gross unrealized gains	14	250
Investment securities available for sale, gross unrealized losses	140	0
Securities AFS	768,249	621,462
US Government Corporations and Agencies Securities [Member]
Investment securities available for sale, amortized cost	7,991	9,226
Investment securities available for sale, gross unrealized gains	54	50
Investment securities available for sale, gross unrealized losses	111	127
Securities AFS	7,934	9,149
Collateralized Mortgage-Backed Securities [Member]
Investment securities available for sale, amortized cost	751,160	797,145
Investment securities available for sale, gross unrealized gains	102	67
Investment securities available for sale, gross unrealized losses	92,831	113,196
Securities AFS	658,431	684,016
Collateralized Mortgage Obligations [Member]
Investment securities available for sale, amortized cost	26,023	27,747
Investment securities available for sale, gross unrealized gains	0	0
Investment securities available for sale, gross unrealized losses	2,096	3,191
Securities AFS	23,927	24,556
Corporate Debt Securities [Member]
Investment securities available for sale, amortized cost	193,154	213,331
Investment securities available for sale, gross unrealized gains	79	145
Investment securities available for sale, gross unrealized losses	3,341	5,531
Securities AFS	$ 189,892	$ 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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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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