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Note 4 - Investment Securities (Details) - Investment Securities - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | $ 1,595,723 | $ 1,324,408
Securities available-for-sale, gross unrealized gains | 6,552 | 6,326
Securities available-for-sale, gross unrealized losses | 15,923 | 11,799
Securities available-for-sale | 1,586,352 | 1,318,935
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 284,678 | 664,206
Securities available-for-sale, gross unrealized gains | 5 | 63
Securities available-for-sale, gross unrealized losses | 395 | 265
Securities available-for-sale | 284,288 | 664,004
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 150,000 |
Securities available-for-sale, gross unrealized losses | 1,840 |
Securities available-for-sale | 148,160 |
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 1,073,108 | 549,296
Securities available-for-sale, gross unrealized gains | 560 | 1,393
Securities available-for-sale, gross unrealized losses | 11,399 | 6,386
Securities available-for-sale | 1,062,269 | 544,303
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 63 | 79
Securities available-for-sale, gross unrealized losses | 27 | 34
Securities available-for-sale | 36 | 45
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 74,955 | 94,943
Securities available-for-sale, gross unrealized gains | 425 | 776
Securities available-for-sale, gross unrealized losses | 1,525 | 1,247
Securities available-for-sale | 73,855 | 94,472
Mutual Funds [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 6,000 | 6,000
Securities available-for-sale, gross unrealized losses | 167 | 134
Securities available-for-sale | 5,833 | 5,866
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 2,811 | 6,276
Securities available-for-sale, gross unrealized gains | 633 | 681
Securities available-for-sale, gross unrealized losses | 228 | 3,733
Securities available-for-sale | 3,216 | 3,224
Other Equity Securities [Member] |  |
Securities Available-for-Sale |  |
Securities available-for-sale, amortized cost | 4,108 | 3,608
Securities available-for-sale, gross unrealized gains | 4,929 | 3,413
Securities available-for-sale, gross unrealized losses | 342 |
Securities available-for-sale | $ 8,695 | $ 7,021

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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=51813488&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=27724398&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=49167202&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=27724398&loc=d3e27161-111563 + Details
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