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Note 7 - Investment Securities (Details) - Temporarily Impaired Securities - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 713,835 | $ 376,601
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 2,569 | 3,998
Securities Available-for-Sale - 12 Months or longer - Fair Value | 49,502 | 494,754
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1,573 | 7,801
Securities Available-for-Sale - Fair Value | 763,337 | 871,355
Securities Available-for-Sale - Unrealized Losses | 4,142 | 11,799
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 703,710 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 2,194 |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 7 | 425,090
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1 | 6,386
Securities Available-for-Sale - Fair Value | 703,717 | 425,090
Securities Available-for-Sale - Unrealized Losses | 2,195 | 6,386
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 38 | 45
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 29 | 34
Securities Available-for-Sale - Fair Value | 38 | 45
Securities Available-for-Sale - Unrealized Losses | 29 | 34
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 9,950 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 50 |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 43,558 | 63,753
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1,442 | 1,247
Securities Available-for-Sale - Fair Value | 53,508 | 63,753
Securities Available-for-Sale - Unrealized Losses | 1,492 | 1,247
Mutual Funds [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair Value | 5,899 | 5,866
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 101 | 134
Securities Available-for-Sale - Fair Value | 5,899 | 5,866
Securities Available-for-Sale - Unrealized Losses | 101 | 134
Other Equity Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 175 |
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 325 |
Securities Available-for-Sale - Fair Value | 175 |
Securities Available-for-Sale - Unrealized Losses | $ 325 |
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
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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