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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Investment securities available for sale, amortized cost | $ 898,463 | $ 1,019,230
Investment securities available for sale, gross unrealized gains | 16,534 | 18,779
Investment securities available for sale, gross unrealized losses | 6,153 | 1,459
Investment securities available for sale, Estimated fair value | 908,844 | 1,036,550
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 40,709 | 80,948
Investment securities available for sale, gross unrealized gains | 11 | 6
Investment securities available for sale, gross unrealized losses | 0 | 6
Investment securities available for sale, Estimated fair value | 40,720 | 80,948
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 95,637 | 99,944
Investment securities available for sale, gross unrealized gains | 705 | 441
Investment securities available for sale, gross unrealized losses | 291 | 546
Investment securities available for sale, Estimated fair value | 96,051 | 99,839
Collateralized Mortgage Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 658,371 | 709,709
Investment securities available for sale, gross unrealized gains | 15,292 | 17,965
Investment securities available for sale, gross unrealized losses | 5,239 | 606
Investment securities available for sale, Estimated fair value | 668,424 | 727,068
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 10,201 | 10,358
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 74 | 34
Investment securities available for sale, Estimated fair value | 10,127 | 10,324
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 93,545 | 118,271
Investment securities available for sale, gross unrealized gains | 526 | 367
Investment securities available for sale, gross unrealized losses | 549 | 267
Investment securities available for sale, Estimated fair value | $ 93,522 | $ 118,371

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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 http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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