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Note 6 - Investments Schedule of Unrealized Losses (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) security | Dec. 31, 2014 USD ($) security | Dec. 31, 2013 USD ($)
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 305 | 62 |
Fair value available-for-sale securities | $ 1,462,577,000 | $ 144,626,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 32,079,000 | $ 2,379,000 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 23 | 2 |
Fair value available-for-sale securities | $ 54,203,000 | $ 4,482,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 2,221,000 | $ 154,000 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 328 | 64 |
Fair value available-for-sale securities | $ 1,516,780,000 | $ 149,108,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | 34,300,000 | 2,533,000 |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Additions, Additional Credit Losses | $ 0 | $ 0 | $ 0
US government and agency securities |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 1 | 0 |
Fair value available-for-sale securities | $ 5,752,000 | $ 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 21,000 | $ 0 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security |  | 1 |
Fair value available-for-sale securities | $ 0 | $ 3,455,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 0 | $ 6,000 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 1 | 1 |
Fair value available-for-sale securities | $ 5,752,000 | $ 3,455,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 21,000 | $ 6,000 |
State and municipal obligations |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 2 |  |
Fair value available-for-sale securities | $ 11,674,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 120,000 |  |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 0 |  |
Fair value available-for-sale securities | $ 0 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 0 |  |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 2 |  |
Fair value available-for-sale securities | $ 11,674,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 120,000 |  |
Corporate bonds and notes |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 117 | 24 |
Fair value available-for-sale securities | $ 510,807,000 | $ 40,917,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 16,773,000 | $ 410,000 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 6 | 1 |
Fair value available-for-sale securities | $ 8,700,000 | $ 1,027,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 518,000 | $ 148,000 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 123 | 25 |
Fair value available-for-sale securities | $ 519,507,000 | $ 41,944,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 17,291,000 | $ 558,000 |
Residential Mortgage Backed Securities [Member] |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 12 |  |
Fair value available-for-sale securities | $ 168,415,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 2,464,000 |  |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 0 |  |
Fair value available-for-sale securities | $ 0 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 0 |  |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 12 |  |
Fair value available-for-sale securities | $ 168,415,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 2,464,000 |  |
CMBS |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 58 |  |
Fair value available-for-sale securities | $ 387,268,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 8,939,000 |  |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 0 |  |
Fair value available-for-sale securities | $ 0 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 0 |  |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 58 |  |
Fair value available-for-sale securities | $ 387,268,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 8,939,000 |  |
Other ABS |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 96 | 34 |
Fair value available-for-sale securities | $ 284,998,000 | $ 97,356,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 2,559,000 | $ 1,727,000 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 14 | 0 |
Fair value available-for-sale securities | $ 43,225,000 | $ 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 1,415,000 | $ 0 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 110 | 34 |
Fair value available-for-sale securities | $ 328,223,000 | $ 97,356,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 3,974,000 | $ 1,727,000 |
Foreign government securities |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 18 | 4 |
Fair value available-for-sale securities | $ 18,733,000 | $ 6,353,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 1,095,000 | $ 242,000 |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 3 | 0 |
Fair value available-for-sale securities | $ 2,278,000 | $ 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 288,000 | $ 0 |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 21 | 4 |
Fair value available-for-sale securities | $ 21,011,000 | $ 6,353,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 1,383,000 | $ 242,000 |
Equity securities |  |  |
Continuous Loss Position Less Than Twelve Months |  |  |
Number of Securities | security | 1 |  |
Fair value available-for-sale securities | $ 74,930,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Aggregate Loss | $ 108,000 |  |
Continuous Unrealized Loss Position, Twelve Months Or Greater |  |  |
Number of securities | security | 0 |  |
Fair value available-for-sale securities | $ 0 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Aggregate Loss | $ 0 |  |
Continuous Loss Position, Total |  |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | security | 1 |  |
Fair value available-for-sale securities | $ 74,930,000 |  |
Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss | $ 108,000 |  |

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