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Note 8 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,336,293 | $ 1,126,867
Investment securities available for sale, gross unrealized gains | 1,393 | 11,075
Investment securities available for sale, gross unrealized losses | 103,115 | 10,633
Securities available-for-sale | 1,234,571 | 1,127,309
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 119,823 |
Investment securities available for sale, gross unrealized gains | 0 |
Investment securities available for sale, gross unrealized losses | 825 |
Securities available-for-sale | 118,998 |
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 75,781 | 86,475
Investment securities available for sale, gross unrealized gains | 1,285 | 1,169
Investment securities available for sale, gross unrealized losses | 125 | 135
Securities available-for-sale | 76,941 | 87,509
Collateralized Mortgage-Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 932,753 | 886,614
Investment securities available for sale, gross unrealized gains | 108 | 9,465
Investment securities available for sale, gross unrealized losses | 88,398 | 7,414
Securities available-for-sale | 844,463 | 888,665
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 23,949 | 9,547
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 1,369 | 430
Securities available-for-sale | 22,580 | 9,117
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 183,987 | 144,231
Investment securities available for sale, gross unrealized gains | 0 | 441
Investment securities available for sale, gross unrealized losses | 12,398 | 2,654
Securities available-for-sale | $ 171,589 | $ 142,018

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
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