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Note 6 - Investment Securities (Details) - Investment Securities (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Securities Available-for-Sale |  |
Available-for-sale Securities - Fair Value | $ 1,578,897 | $ 1,586,668
Total investment securities - Amortized Cost | 1,617,014 | 1,637,965
Total investment securities - Gross Unrealized Gains | 15,372 | 18,511
Total investment securities - Gross Unrealized Losses | 53,489 | 69,808
Total investment securities - Fair Value | 1,578,897 | 1,586,668
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 475,139 | 460,095
Securities Available-for-sale, Gross Unrealized Gains | 120 | 99
Securities Available-for-sale, Gross Unrealized Losses |  | 1
Available-for-sale Securities - Fair Value | 475,259 | 460,193
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 969,042 | 1,010,294
Securities Available-for-sale, Gross Unrealized Gains | 1,860 | 7,049
Securities Available-for-sale, Gross Unrealized Losses | 49,749 | 64,529
Available-for-sale Securities - Fair Value | 921,153 | 952,814
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 82 | 5,929
Securities Available-for-sale, Gross Unrealized Gains |  | 231
Securities Available-for-sale, Gross Unrealized Losses | 39 | 54
Available-for-sale Securities - Fair Value | 43 | 6,106
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 165,716 | 154,955
Securities Available-for-sale, Gross Unrealized Gains | 423 | 298
Securities Available-for-sale, Gross Unrealized Losses | 3,458 | 4,949
Available-for-sale Securities - Fair Value | 162,681 | 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 | 243 | 275
Available-for-sale Securities - Fair Value | 5,757 | 5,725
Preferred Stock Of Government Sponsored Entities Member |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 535 | 569
Securities Available-for-sale, Gross Unrealized Gains | 12,909 | 10,834
Available-for-sale Securities - Fair Value | 13,444 | 11,403
Other Equity Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 500 |
Securities Available-for-sale, Gross Unrealized Gains | 60 |
Available-for-sale Securities - Fair Value | 560 |
Total [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost | 1,617,014 | 1,637,965
Securities Available-for-sale, Gross Unrealized Gains | 15,372 | 18,511
Securities Available-for-sale, Gross Unrealized Losses | 53,489 | 69,808
Available-for-sale Securities - Fair Value | 1,578,897 | 1,586,668
Asset-backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-sale, Amortized Cost |  | 123
Available-for-sale Securities - 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 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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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + 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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