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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

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- 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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- 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 + Details
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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 + Details
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