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Note 6 - Investment Securities (Details) - Investment Securities (USD $) In Thousands, unless otherwise specified | Sep. 30, 2014 | Dec. 31, 2013
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Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | $ 1,355,056 | $ 1,637,965
Securities Available-for-sale, Gross Unrealized Gains | 7,710 | 18,511
Securities Available-for-sale, Gross Unrealized Losses | 22,674 | 69,808
Securities Available-for-sale, Fair Value | 1,340,092 | 1,586,668
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 539,919 | 460,095
Securities Available-for-sale, Gross Unrealized Gains | 198 | 99
Securities Available-for-sale, Gross Unrealized Losses | 29 | 1
Securities Available-for-sale, Fair Value | 540,088 | 460,193
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 703,312 | 1,010,294
Securities Available-for-sale, Gross Unrealized Gains | 1,085 | 7,049
Securities Available-for-sale, Gross Unrealized Losses | 21,073 | 64,529
Securities Available-for-sale, Fair Value | 683,324 | 952,814
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 80 | 5,929
Securities Available-for-sale, Gross Unrealized Gains |  | 231
Securities Available-for-sale, Gross Unrealized Losses | 34 | 54
Securities Available-for-sale, Fair Value | 46 | 6,106
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 94,941 | 154,955
Securities Available-for-sale, Gross Unrealized Gains | 751 | 298
Securities Available-for-sale, Gross Unrealized Losses | 1,355 | 4,949
Securities Available-for-sale, Fair Value | 94,337 | 150,304
Mutual Funds [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 6,000 | 6,000
Securities Available-for-sale, Gross Unrealized Losses | 183 | 275
Securities Available-for-sale, Fair Value | 5,817 | 5,725
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 7,196 | 569
Securities Available-for-sale, Gross Unrealized Gains | 2,056 | 10,834
Securities Available-for-sale, Fair Value | 9,252 | 11,403
Other Equity Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 3,608 |
Securities Available-for-sale, Gross Unrealized Gains | 3,620 |
Securities Available-for-sale, Fair Value | 7,228 |
Asset-backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost |  | 123
Securities Available-for-sale, Fair Value |  | $ 123

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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=28360136&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=6871852&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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- 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=27724398&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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