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Note 7 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Investment securities available for sale, amortized cost | $ 1,468,452 | $ 1,267,731
Investment securities available for sale, gross unrealized gains | 7,557 | 1,778
Investment securities available for sale, gross unrealized losses | 4,425 | 27,000
Investment securities available for sale, Estimated fair value | 1,471,584 | 1,242,509
US Treasury Securities [Member] |  |
Investment securities available for sale, amortized cost | 49,750 | 124,801
Investment securities available for sale, gross unrealized gains | 41 | 0
Investment securities available for sale, gross unrealized losses | 0 | 50
Investment securities available for sale, Estimated fair value | 49,791 | 124,751
US Government Corporations and Agencies Securities [Member] |  |
Investment securities available for sale, amortized cost | 76,695 | 6,066
Investment securities available for sale, gross unrealized gains | 715 | 0
Investment securities available for sale, gross unrealized losses | 158 | 195
Investment securities available for sale, Estimated fair value | 77,252 | 5,871
US Government-sponsored Enterprises Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 400,000 | 400,000
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 1,660 | 11,638
Investment securities available for sale, Estimated fair value | 398,340 | 388,362
Collateralized Mortgage Backed Securities [Member] |  |
Investment securities available for sale, amortized cost | 842,315 | 670,874
Investment securities available for sale, gross unrealized gains | 6,336 | 960
Investment securities available for sale, gross unrealized losses | 2,546 | 15,089
Investment securities available for sale, Estimated fair value | 846,105 | 656,745
Collateralized Mortgage Obligations [Member] |  |
Investment securities available for sale, amortized cost | 795 | 1,005
Investment securities available for sale, gross unrealized gains | 0 | 0
Investment securities available for sale, gross unrealized losses | 18 | 28
Investment securities available for sale, Estimated fair value | 777 | 977
Corporate Debt Securities [Member] |  |
Investment securities available for sale, amortized cost | 98,897 | 64,985
Investment securities available for sale, gross unrealized gains | 465 | 818
Investment securities available for sale, gross unrealized losses | 43 | 0
Investment securities available for sale, Estimated fair value | $ 99,319 | $ 65,803

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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=118939692&loc=d3e27161-111563 + Details
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