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Note 4 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Securities available-for-sale, amortized cost | $ 1,317,012 | $ 1,595,723 |
Securities available-for-sale, gross unrealized gains | 12,301 | 6,552 |
Securities available-for-sale, gross unrealized losses | 14,968 | 15,923 |
Securities available-for-sale | 1,314,345 | 1,586,352 | [1]
US Treasury Securities [Member] |  |  |
Securities available-for-sale, amortized cost | 489,839 | 284,678 |
Securities available-for-sale, gross unrealized gains | 35 | 5 |
Securities available-for-sale, gross unrealized losses | 857 | 395 |
Securities available-for-sale | 489,017 | 284,288 |
US Government-sponsored Enterprises Debt Securities [Member] |  |  |
Securities available-for-sale, amortized cost | 400,000 | 150,000 |
Securities available-for-sale, gross unrealized gains |  |  |
Securities available-for-sale, gross unrealized losses | 9,669 | 1,840 |
Securities available-for-sale | 390,331 | 148,160 |
Collateralized Mortgage Backed Securities [Member] |  |  |
Securities available-for-sale, amortized cost | 339,241 | 1,073,108 |
Securities available-for-sale, gross unrealized gains | 309 | 560 |
Securities available-for-sale, gross unrealized losses | 3,290 | 11,399 |
Securities available-for-sale | 336,260 | 1,062,269 |
Collateralized Mortgage Obligations [Member] |  |  |
Securities available-for-sale, amortized cost | 48 | 63 |
Securities available-for-sale, gross unrealized gains |  |  |
Securities available-for-sale, gross unrealized losses | 20 | 27 |
Securities available-for-sale | 28 | 36 |
Corporate Debt Securities [Member] |  |  |
Securities available-for-sale, amortized cost | 74,965 | 74,955 |
Securities available-for-sale, gross unrealized gains | 247 | 425 |
Securities available-for-sale, gross unrealized losses | 862 | 1,525 |
Securities available-for-sale | 74,350 | 73,855 |
Mutual Funds [Member] |  |  |
Securities available-for-sale, amortized cost | 6,500 | 6,000 |
Securities available-for-sale, gross unrealized gains |  |  |
Securities available-for-sale, gross unrealized losses | 270 | 167 |
Securities available-for-sale | 6,230 | 5,833 |
Preferred Stock of Government Sponsored Entities [Member] |  |  |
Securities available-for-sale, amortized cost | 2,811 | 2,811 |
Securities available-for-sale, gross unrealized gains | 4,497 | 633 |
Securities available-for-sale, gross unrealized losses |  | 228 |
Securities available-for-sale | 7,308 | 3,216 | [2]
Other Equity Securities [Member] |  |  |
Securities available-for-sale, amortized cost | 3,608 | 4,108 |
Securities available-for-sale, gross unrealized gains | 7,213 | 4,929 |
Securities available-for-sale, gross unrealized losses |  | 342 |
Securities available-for-sale | $ 10,821 | $ 8,695 | [2]
[1] | Preferred stock of government sponsored entities and other equity securities as of December 31, 2015 were reclassified as level 1 rather than level 2 as originally classified due to the availability of quoted prices in active markets.
[2] | Preferred stock of government sponsored entities and other equity securities as of December 31, 2015 were reclassified as level 1 rather than level 2 as originally classified due to the availability of quoted prices in active markets.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27161-111563 + Details
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