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Note 6 - Investment Securities - Investment Securities (Details) - USD ($) | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Securities available-for-sale, amortized cost | $ 1,230,785,000 | $ 1,317,012,000 |  |
Securities available-for-sale, gross unrealized gains | 9,098,000 | 12,301,000 |  |
Securities available-for-sale, gross unrealized losses | 12,154,000 | 14,968,000 |  |
Securities available-for-sale | 1,227,729,000 | 1,314,345,000 | [1] | $ 1,300,000,000
US Treasury Securities [Member] |  |  |  |
Securities available-for-sale, amortized cost | 419,881,000 | 489,839,000 |  |
Securities available-for-sale, gross unrealized gains |  | 35,000 |  |
Securities available-for-sale, gross unrealized losses | 411,000 | 857,000 |  |
Securities available-for-sale | 419,470,000 | 489,017,000 |  |
US Government-sponsored Enterprises Debt Securities [Member] |  |  |  |
Securities available-for-sale, amortized cost | 400,000,000 | 400,000,000 |  |
Securities available-for-sale, gross unrealized gains |  |  |  |
Securities available-for-sale, gross unrealized losses | 8,014,000 | 9,669,000 |  |
Securities available-for-sale | 391,986,000 | 390,331,000 |  |
Collateralized Mortgage Backed Securities [Member] |  |  |  |
Securities available-for-sale, amortized cost | 323,017,000 | 339,241,000 |  |
Securities available-for-sale, gross unrealized gains | 268,000 | 309,000 |  |
Securities available-for-sale, gross unrealized losses | 3,124,000 | 3,290,000 |  |
Securities available-for-sale | 320,161,000 | 336,260,000 |  |
Corporate Debt Securities [Member] |  |  |  |
Securities available-for-sale, amortized cost | 74,968,000 | 74,965,000 |  |
Securities available-for-sale, gross unrealized gains | 378,000 | 247,000 |  |
Securities available-for-sale, gross unrealized losses | 335,000 | 862,000 |  |
Securities available-for-sale | 75,011,000 | 74,350,000 |  |
Collateralized Mortgage Obligations [Member] |  |  |  |
Securities available-for-sale, amortized cost |  | 48,000 |  |
Securities available-for-sale, gross unrealized gains |  |  |  |
Securities available-for-sale, gross unrealized losses |  | 20,000 |  |
Securities available-for-sale |  | 28,000 |  |
Mutual Funds [Member] |  |  |  |
Securities available-for-sale, amortized cost | 6,500,000 | 6,500,000 |  |
Securities available-for-sale, gross unrealized gains |  |  |  |
Securities available-for-sale, gross unrealized losses | 270,000 | 270,000 |  |
Securities available-for-sale | 6,230,000 | 6,230,000 |  |
Preferred Stock of Government Sponsored Entities [Member] |  |  |  |
Securities available-for-sale, amortized cost | 2,811,000 | 2,811,000 |  |
Securities available-for-sale, gross unrealized gains | 3,167,000 | 4,497,000 |  |
Securities available-for-sale, gross unrealized losses |  |  |  |
Securities available-for-sale | 5,978,000 | 7,308,000 | [2] |
Other Equity Securities [Member] |  |  |  |
Securities available-for-sale, amortized cost | 3,608,000 | 3,608,000 |  |
Securities available-for-sale, gross unrealized gains | 5,285,000 | 7,213,000 |  |
Securities available-for-sale, gross unrealized losses |  |  |  |
Securities available-for-sale | $ 8,892,000 | $ 10,821,000 | [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=75030427&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=82897076&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=82896770&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=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss 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 (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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