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Note 6 - Investment Securities (Details) - Investment Securities - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | $ 1,476,424 | $ 1,595,723
Securities available-for-sale, gross unrealized gains | 11,575 | 6,552
Securities available-for-sale, gross unrealized losses | 2,875 | 15,923
Securities available-for-sale | 1,485,124 | 1,586,352
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 224,750 | 284,678
Securities available-for-sale, gross unrealized gains | 61 | 5
Securities available-for-sale, gross unrealized losses | 7 | 395
Securities available-for-sale | 224,804 | 284,288
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 100,000 | 150,000
Securities available-for-sale, gross unrealized gains | 10 |
Securities available-for-sale, gross unrealized losses |  | 1,840
Securities available-for-sale | 100,010 | 148,160
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 1,063,944 | 1,073,108
Securities available-for-sale, gross unrealized gains | 6,553 | 560
Securities available-for-sale, gross unrealized losses | 4 | 11,399
Securities available-for-sale | 1,070,493 | 1,062,269
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 60 | 63
Securities available-for-sale, gross unrealized losses | 26 | 27
Securities available-for-sale | 34 | 36
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 74,957 | 74,955
Securities available-for-sale, gross unrealized gains | 413 | 425
Securities available-for-sale, gross unrealized losses | 2,267 | 1,525
Securities available-for-sale | 73,103 | 73,855
Mutual Funds [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 6,000 | 6,000
Securities available-for-sale, gross unrealized losses | 85 | 167
Securities available-for-sale | 5,915 | 5,833
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 2,811 | 2,811
Securities available-for-sale, gross unrealized gains | 478 | 633
Securities available-for-sale, gross unrealized losses | 486 | 228
Securities available-for-sale | 2,803 | 3,216
Other Equity Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 3,902 | 4,108
Securities available-for-sale, gross unrealized gains | 4,060 | 4,929
Securities available-for-sale, gross unrealized losses |  | 342
Securities available-for-sale | $ 7,962 | $ 8,695

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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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