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Note 6 - Investment Securities - Temporarily Impaired Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
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US Treasury Securities [Member] |  |
Temporarily Impaired Securities, Less than 12 months, Fair Value | $ 149,983 | $ 224,289
Temporarily Impaired Securities, Less than 12 months, Unrealized Losses | 24 | 395
Temporarily Impaired Securities, 12 months or longer Fair Value |  |
Temporarily Impaired Securities, 12 months or longer Unrealized Losses |  |
Temporarily impaired securities, Total fair value | 149,983 | 224,289
Temporarily impaired securities, Total unrealized losses | 24 | 395
US Government-sponsored Enterprises Debt Securities [Member] |  |
Temporarily Impaired Securities, Less than 12 months, Fair Value | 149,931 | 148,160
Temporarily Impaired Securities, Less than 12 months, Unrealized Losses | 69 | 1,840
Temporarily Impaired Securities, 12 months or longer Fair Value |  |
Temporarily Impaired Securities, 12 months or longer Unrealized Losses |  |
Temporarily impaired securities, Total fair value | 149,931 | 148,160
Temporarily impaired securities, Total unrealized losses | 69 | 1,840
Collateralized Mortgage Backed Securities [Member] |  |
Temporarily Impaired Securities, Less than 12 months, Fair Value | 44 | 1,025,342
Temporarily Impaired Securities, Less than 12 months, Unrealized Losses | 1 | 11,398
Temporarily Impaired Securities, 12 months or longer Fair Value | 265 | 6
Temporarily Impaired Securities, 12 months or longer Unrealized Losses | 1 | 1
Temporarily impaired securities, Total fair value | 309 | 1,025,348
Temporarily impaired securities, Total unrealized losses | 2 | 11,399
Collateralized Mortgage Obligations [Member] |  |
Temporarily Impaired Securities, Less than 12 months, Fair Value |  |
Temporarily Impaired Securities, Less than 12 months, Unrealized Losses |  |
Temporarily Impaired Securities, 12 months or longer Fair Value | 30 | 36
Temporarily Impaired Securities, 12 months or longer Unrealized Losses | 22 | 27
Temporarily impaired securities, Total fair value | 30 | 36
Temporarily impaired securities, Total unrealized losses | 22 | 27
Corporate Debt Securities [Member] |  |
Temporarily Impaired Securities, Less than 12 months, Fair Value |  | 9,950
Temporarily Impaired Securities, Less than 12 months, Unrealized Losses |  | 50
Temporarily Impaired Securities, 12 months or longer Fair Value | 54,063 | 43,525
Temporarily Impaired Securities, 12 months or longer Unrealized Losses | 937 | 1,475
Temporarily impaired securities, Total fair value | 54,063 | 53,475
Temporarily impaired securities, Total unrealized losses | 937 | 1,525
Mutual Funds [Member] |  |
Temporarily Impaired Securities, Less than 12 months, Fair Value |  |
Temporarily Impaired Securities, Less than 12 months, Unrealized Losses |  |
Temporarily Impaired Securities, 12 months or longer Fair Value | 5,926 | 5,833
Temporarily Impaired Securities, 12 months or longer Unrealized Losses | 74 | 167
Temporarily impaired securities, Total fair value | 5,926 | 5,833
Temporarily impaired securities, Total unrealized losses | 74 | 167
Preferred Stock of Government Sponsored Entities [Member] |  |
Temporarily Impaired Securities, Less than 12 months, Fair Value | 2,528 | 2,488
Temporarily Impaired Securities, Less than 12 months, Unrealized Losses | 188 | 228
Temporarily Impaired Securities, 12 months or longer Fair Value |  |
Temporarily Impaired Securities, 12 months or longer Unrealized Losses |  |
Temporarily impaired securities, Total fair value | 2,528 | 2,488
Temporarily impaired securities, Total unrealized losses | 188 | 228
Other Equity Securities [Member] |  |
Temporarily Impaired Securities, Less than 12 months, Fair Value |  | 158
Temporarily Impaired Securities, Less than 12 months, Unrealized Losses |  | 342
Temporarily Impaired Securities, 12 months or longer Fair Value |  |
Temporarily Impaired Securities, 12 months or longer Unrealized Losses |  |
Temporarily impaired securities, Total fair value |  | 158
Temporarily impaired securities, Total unrealized losses |  | 342
Temporarily Impaired Securities, Less than 12 months, Fair Value | 302,486 | 1,410,387
Temporarily Impaired Securities, Less than 12 months, Unrealized Losses | 282 | 14,253
Temporarily Impaired Securities, 12 months or longer Fair Value | 60,284 | 49,400
Temporarily Impaired Securities, 12 months or longer Unrealized Losses | 1,034 | 1,670
Temporarily impaired securities, Total fair value | 362,770 | 1,459,787
Temporarily impaired securities, Total unrealized losses | $ 1,316 | $ 15,923

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