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Note 6 - Investment Securities (Details) - Temporarily Impaired Securities - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | $ 42,534 | $ 1,410,387
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 546 | 14,253
Securities Available-for-Sale - 12 Months or longer - Fair value | 48,778 | 49,400
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 2,329 | 1,670
Securities Available-for-Sale - Fair Value | 91,312 | 1,459,787
Securities Available-for-Sale - Unrealized Losses | 2,875 | 15,923
US Treasury Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 29,965 | 224,289
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 7 | 395
Securities Available-for-Sale - Fair Value | 29,965 | 224,289
Securities Available-for-Sale - Unrealized Losses | 7 | 395
Collateralized Mortgage Backed Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 389 | 1,025,342
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 3 | 11,398
Securities Available-for-Sale - 12 Months or longer - Fair value | 46 | 6
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 1 | 1
Securities Available-for-Sale - Fair Value | 435 | 1,025,348
Securities Available-for-Sale - Unrealized Losses | 4 | 11,399
Collateralized Mortgage Obligations [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair value | 34 | 36
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 26 | 27
Securities Available-for-Sale - Fair Value | 34 | 36
Securities Available-for-Sale - Unrealized Losses | 26 | 27
Corporate Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 9,950 | 9,950
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 50 | 50
Securities Available-for-Sale - 12 Months or longer - Fair value | 42,783 | 43,525
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 2,217 | 1,475
Securities Available-for-Sale - Fair Value | 52,733 | 53,475
Securities Available-for-Sale - Unrealized Losses | 2,267 | 1,525
Mutual Funds [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - 12 Months or longer - Fair value | 5,915 | 5,833
Securities Available-for-Sale - 12 Months or longer - Unrealized Losses | 85 | 167
Securities Available-for-Sale - Fair Value | 5,915 | 5,833
Securities Available-for-Sale - Unrealized Losses | 85 | 167
Preferred Stock of Government Sponsored Entities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value | 2,230 | 2,488
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses | 486 | 228
Securities Available-for-Sale - Fair Value | 2,230 | 2,488
Securities Available-for-Sale - Unrealized Losses | $ 486 | 228
US Government-sponsored Enterprises Debt Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 148,160
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 1,840
Securities Available-for-Sale - Fair Value |  | 148,160
Securities Available-for-Sale - Unrealized Losses |  | 1,840
Other Equity Securities [Member] |  |
Securities Available-for-Sale |  |
Securities Available-for-Sale - Less than 12 Months - Fair Value |  | 158
Securities Available-for-Sale - Less than 12 Months - Unrealized Losses |  | 342
Securities Available-for-Sale - Fair Value |  | 158
Securities Available-for-Sale - Unrealized Losses |  | $ 342

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