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Note 6 - Investment Securities - Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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US Treasury Securities [Member] |  |
Securities Available-for-Sale, Amortized Cost | $ 389,921 | $ 284,678
Securities Available-for-Sale, Gross Unrealized Gains | 112 | 5
Securities Available-for-Sale, Gross Unrealized Losses | 24 | 395
Available-for-sale Securities | 390,009 | 284,288
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities Available-for-Sale, Amortized Cost | 250,000 | 150,000
Securities Available-for-Sale, Gross Unrealized Gains | 79 |
Securities Available-for-Sale, Gross Unrealized Losses | 69 | 1,840
Available-for-sale Securities | 250,010 | 148,160
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale, Amortized Cost | 556,454 | 1,073,108
Securities Available-for-Sale, Gross Unrealized Gains | 7,186 | 560
Securities Available-for-Sale, Gross Unrealized Losses | 2 | 11,399
Available-for-sale Securities | 563,638 | 1,062,269
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale, Amortized Cost | 52 | 63
Securities Available-for-Sale, Gross Unrealized Gains |  |
Securities Available-for-Sale, Gross Unrealized Losses | 22 | 27
Available-for-sale Securities | 30 | 36
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale, Amortized Cost | 74,962 | 74,955
Securities Available-for-Sale, Gross Unrealized Gains | 444 | 425
Securities Available-for-Sale, Gross Unrealized Losses | 937 | 1,525
Available-for-sale Securities | 74,469 | 73,855
Mutual Funds [Member] |  |
Securities Available-for-Sale, Amortized Cost | 6,000 | 6,000
Securities Available-for-Sale, Gross Unrealized Gains |  |
Securities Available-for-Sale, Gross Unrealized Losses | 74 | 167
Available-for-sale Securities | 5,926 | 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 | 565 | 633
Securities Available-for-Sale, Gross Unrealized Losses | 188 | 228
Available-for-sale Securities | 3,188 | 3,216
Other Equity Securities [Member] |  |
Securities Available-for-Sale, Amortized Cost | 3,608 | 4,108
Securities Available-for-Sale, Gross Unrealized Gains | 7,591 | 4,929
Securities Available-for-Sale, Gross Unrealized Losses |  | 342
Available-for-sale Securities | 11,199 | 8,695
Securities Available-for-Sale, Amortized Cost | 1,283,808 | 1,595,723
Securities Available-for-Sale, Gross Unrealized Gains | 15,977 | 6,552
Securities Available-for-Sale, Gross Unrealized Losses | 1,316 | 15,923
Available-for-sale Securities | $ 1,298,469 | $ 1,586,352

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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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