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Note 3 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,019,230 | $ 1,443,730
Investment securities available for sale, gross unrealized gains | 18,779 | 9,852
Investment securities available for sale, gross unrealized losses | 1,459 | 1,740
Investment securities available for sale, Estimated fair value | 1,036,550 | 1,451,842
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 80,948 | 74,926
Investment securities available for sale, gross unrealized gains | 6 | 10
Investment securities available for sale, gross unrealized losses | 6 | 0
Investment securities available for sale, Estimated fair value | 80,948 | 74,936
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 99,944 | 90,452
Investment securities available for sale, gross unrealized gains | 441 | 663
Investment securities available for sale, gross unrealized losses | 546 | 319
Investment securities available for sale, Estimated fair value | 99,839 | 90,796
Collateralized Mortgage Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 709,709 | 880,040
Investment securities available for sale, gross unrealized gains | 17,965 | 8,574
Investment securities available for sale, gross unrealized losses | 606 | 824
Investment securities available for sale, Estimated fair value | 727,068 | 887,790
US Government-sponsored Enterprises Debt Securities [Member] |  |
Investment securities available for sale, amortized cost |  | 225,000
Investment securities available for sale, gross unrealized gains |  | 0
Investment securities available for sale, gross unrealized losses |  | 557
Investment securities available for sale, Estimated fair value |  | 224,443
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 10,358 | 569
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 34 | 17
Investment securities available for sale, Estimated fair value | 10,324 | 552
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 118,271 | 172,743
Investment securities available for sale, gross unrealized gains | 367 | 605
Investment securities available for sale, gross unrealized losses | 267 | 23
Investment securities available for sale, Estimated fair value | $ 118,371 | $ 173,325

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