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Note 16 - Fair Value Measurements (Details) - Financial Assets and Liabilities Measured On a Non-recurring Basis - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Assets |  |  |  |  |  |
Fair value measurement | $ 58,889 |  | $ 76,234 |  |  |
Total losses/gains | 2,507 |  | 4,596 |  | $ 3,344 |
Impaired Loans [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 39,685 |  | 49,554 |  |  |
Total losses/gains | 1,550 |  | 3,958 |  | 6,069 |
Other Real Estate Owned [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 14,282 | [1] | 20,568 | [2] |  |
Total losses/gains | 404 | [1] | 202 | [1],[2] | (3,134) | [2]
Investments in Venture Capital [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 4,922 |  | 5,495 |  |  |
Total losses/gains | 553 |  | 436 |  | 409 |
Equity Investments [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement |  |  | 617 |  |  |
Commercial Portfolio Segment [Member] | Impaired Loans [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 6,317 |  | 3,774 |  |  |
Total losses/gains | 806 |  | 17 |  | 5,731 |
Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 20,359 |  | 25,029 |  |  |
Total losses/gains | 598 |  | 3,914 |  | 125 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Impaired Loans [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 13,009 |  | 13,126 |  |  |
Total losses/gains | $ 146 |  | 27 |  | $ 213 |
Construction Residential [Member] | Impaired Loans [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement |  |  | $ 7,625 |  |  |
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement |  | [1] |  | [2] |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | $ 10,047 |  | $ 16,458 |  |  |
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 10,047 | [1] | 16,458 | [2] |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 48,842 |  | 59,776 |  |  |
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 39,685 |  | 49,554 |  |  |
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 4,235 | [1] | 4,110 | [2] |  |
Fair Value, Inputs, Level 3 [Member] | Investments in Venture Capital [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 4,922 |  | 5,495 |  |  |
Fair Value, Inputs, Level 3 [Member] | Equity Investments [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement |  |  | 617 |  |  |
Fair Value, Inputs, Level 3 [Member] | Commercial Portfolio Segment [Member] | Impaired Loans [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 6,317 |  | 3,774 |  |  |
Fair Value, Inputs, Level 3 [Member] | Commercial Real Estate Portfolio Segment [Member] | Impaired Loans [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | 20,359 |  | 25,029 |  |  |
Fair Value, Inputs, Level 3 [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Impaired Loans [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement | $ 13,009 |  | 13,126 |  |  |
Fair Value, Inputs, Level 3 [Member] | Construction Residential [Member] | Impaired Loans [Member] |  |  |  |  |  |
Assets |  |  |  |  |  |
Fair value measurement |  |  | $ 7,625 |  |  |
[1] | Other real estate owned balance of $24.7. million in the Consolidated Balance Sheets is net of estimated disposal costs.
[2] | Other real estate owned balance of $31.5 million in the Consolidated Balance Sheets is net of estimated disposal costs.

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