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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,122,994 | $ 1,443,730
Investment securities available for sale, gross unrealized gains | 24,313 | 9,852
Investment securities available for sale, gross unrealized losses | 1,205 | 1,740
Investment securities available for sale, Estimated fair value | 1,146,102 | 1,451,842
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 99,935 | 74,926
Investment securities available for sale, gross unrealized gains | 1 | 10
Investment securities available for sale, gross unrealized losses | 9 | 0
Investment securities available for sale, Estimated fair value | 99,927 | 74,936
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 107,558 | 90,452
Investment securities available for sale, gross unrealized gains | 499 | 663
Investment securities available for sale, gross unrealized losses | 664 | 319
Investment securities available for sale, Estimated fair value | 107,393 | 90,796
Collateralized Mortgage Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 779,492 | 880,040
Investment securities available for sale, gross unrealized gains | 23,428 | 8,574
Investment securities available for sale, gross unrealized losses | 508 | 824
Investment securities available for sale, Estimated fair value | 802,412 | 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 | 314 | 569
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 13 | 17
Investment securities available for sale, Estimated fair value | 301 | 552
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 135,695 | 172,743
Investment securities available for sale, gross unrealized gains | 385 | 605
Investment securities available for sale, gross unrealized losses | 11 | 23
Investment securities available for sale, Estimated fair value | $ 136,069 | $ 173,325

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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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