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Note 6 - Investment Securities (Details) - Temporarily Impaired Securities - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 1,087,454 | $ 376,601
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 9,655 | 3,998
Securities Available-for-Sale - 12 Months or longer - Fair Value | 49,812 | 494,754
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1,265 | 7,801
Securities Available-for-Sale - Fair Value | 1,137,266 | 871,355
Securities Available-for-Sale - Unrealized Losses | 10,920 | 11,799
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 1,087,436 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 9,653 |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 6 |
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1 |
Securities Available-for-Sale - Fair Value | 1,087,442 |
Securities Available-for-Sale - Unrealized Losses | 9,654 |
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 40 | 45
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 30 | 34
Securities Available-for-Sale - Fair Value | 40 | 45
Securities Available-for-Sale - Unrealized Losses | 30 | 34
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 43,922 | 63,753
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1,078 | 1,247
Securities Available-for-Sale - Fair Value | 43,922 | 63,753
Securities Available-for-Sale - Unrealized Losses | 1,078 | 1,247
Mutual Funds [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 5,844 | 5,866
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 156 | 134
Securities Available-for-Sale - Fair Value | 5,844 | 5,866
Securities Available-for-Sale - Unrealized Losses | 156 | 134
Other Equity Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 18 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 2 |
Securities Available-for-Sale - Fair Value | 18 |
Securities Available-for-Sale - Unrealized Losses | $ 2 |
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 374,153
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 265
Securities Available-for-Sale - Fair Value |  | 374,153
Securities Available-for-Sale - Unrealized Losses |  | 265
Mortgage Backed Securities Non Agency [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value |  | 425,090
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses |  | 6,386
Securities Available-for-Sale - Fair Value |  | 425,090
Securities Available-for-Sale - Unrealized Losses |  | 6,386
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 2,448
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 3,733
Securities Available-for-Sale - Fair Value |  | 2,448
Securities Available-for-Sale - Unrealized Losses |  | $ 3,733

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