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Note 6 - Investment Securities (Details) - Temporarily Impaired Securities (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Dec. 31, 2013
Securities Available-for-Sale |  |
Investment Securities - Less than 12 Months - Fair Value | $ 914,384 | $ 877,208
Investment Securities - Less than 12 Months - Unrealized Losses | 49,750 | 64,562
Investment Securities - 12 Months or longer - Fair Value | 102,495 | 106,378
Investment Securities- 12 Months or longer - Unrealized Losses | 3,739 | 5,246
Investment Securities - Fair Value | 1,016,879 | 983,586
Investment Securities - Unrealized Losses | 53,489 | 69,808
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 888,606 | 792,012
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 49,748 | 64,526
Securities Available-for-Sale - 12 Months or longer - Fair Value | 151 | 272
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1 | 2
Securities Available-for-Sale - Fair Value | 888,757 | 792,284
Securities Available-for-Sale - Unrealized Losses | 49,749 | 64,528
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 68
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 4
Securities Available-for-Sale - 12 Months or longer - Fair Value | 43 | 301
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 39 | 50
Securities Available-for-Sale - Fair Value | 43 | 369
Securities Available-for-Sale - Unrealized Losses | 39 | 54
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 25,778 | 9,970
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 2 | 30
Securities Available-for-Sale - 12 Months or longer - Fair Value | 96,544 | 100,081
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 3,456 | 4,919
Securities Available-for-Sale - Fair Value | 122,322 | 110,051
Securities Available-for-Sale - Unrealized Losses | 3,458 | 4,949
Mutual Funds [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 5,757 | 5,724
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 243 | 275
Securities Available-for-Sale - Fair Value | 5,757 | 5,724
Securities Available-for-Sale - Unrealized Losses | 243 | 275
Total [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 914,384 | 877,208
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 49,750 | 64,562
Securities Available-for-Sale - 12 Months or longer - Fair Value | 102,495 | 106,378
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 3,739 | 5,246
Securities Available-for-Sale - Fair Value | 1,016,879 | 983,586
Securities Available-for-Sale - Unrealized Losses | 53,489 | 69,808
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 75,064
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 1
Securities Available-for-Sale - Fair Value |  | 75,064
Securities Available-for-Sale - Unrealized Losses |  | 1
Mortgage Backed Securities Non Agency [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 94
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 1
Securities Available-for-Sale - Fair Value |  | 94
Securities Available-for-Sale - Unrealized Losses |  | $ 1

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- Definition Amount of unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563 + Details
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