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Note 4 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,726,080 | $ 1,622,173
Investment securities available for sale, gross unrealized gains | 515 | 690
Investment securities available for sale, gross unrealized losses | 122,025 | 149,515
Securities available-for-sale | 1,604,570 | 1,473,348
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 495,167 | 241,611
Investment securities available for sale, gross unrealized gains | 153 | 0
Investment securities available for sale, gross unrealized losses | 20 | 1,111
Securities available-for-sale | 495,300 | 240,500
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 48,282 | 63,347
Investment securities available for sale, gross unrealized gains | 117 | 384
Investment securities available for sale, gross unrealized losses | 230 | 121
Securities available-for-sale | 48,169 | 63,610
Collateralized Mortgage-Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 892,942 | 993,883
Investment securities available for sale, gross unrealized gains | 223 | 194
Investment securities available for sale, gross unrealized losses | 106,442 | 126,983
Securities available-for-sale | 786,723 | 867,094
US Government-sponsored Enterprises Debt Securities [Member] |  |
Investment securities available for sale, amortized cost |  | 30,000
Investment securities available for sale, gross unrealized gains |  | 0
Investment securities available for sale, gross unrealized losses |  | 0
Securities available-for-sale | 0 | 30,000
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 31,238 | 34,552
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 3,194 | 3,491
Securities available-for-sale | 28,044 | 31,061
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 258,451 | 258,780
Investment securities available for sale, gross unrealized gains | 22 | 112
Investment securities available for sale, gross unrealized losses | 12,139 | 17,809
Securities available-for-sale | $ 246,334 | $ 241,083

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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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