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Note 11 - Fair Value Measurements (Details) - Financial Assets and Liabilities Measured On a Non-recurring Basis - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015 | Dec. 31, 2014
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | $ 54,972 |  |  |  | $ 58,889 |  |  |
Total losses/gains | 238 |  | $ 609 |  | 2,507 |  | $ 4,596 |
Impaired Loans [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 34,029 |  |  |  | 39,685 |  |  |
Total losses/gains |  |  | 204 |  | 1,550 |  | 3,958 |
Other Real Estate Owned [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 16,112 | [1] |  |  | 14,282 | [2] |  |
Total losses/gains | 128 | [1] | 181 | [1] | 404 | [2] | 202 | [2]
Investments in Venture Capital [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 4,831 |  |  |  | 4,922 |  |  |
Total losses/gains | $ 110 |  | 224 |  | $ 553 |  | 436 |
Fair Value, Inputs, Level 1 [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement |  | [1] |  |  |  | [2] |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | $ 11,906 |  |  |  | $ 10,047 |  |  |
Fair Value, Inputs, Level 2 [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 11,906 | [1] |  |  | 10,047 | [2] |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 43,066 |  |  |  | 48,842 |  |  |
Fair Value, Inputs, Level 3 [Member] | Impaired Loans [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 34,029 |  |  |  | 39,685 |  |  |
Fair Value, Inputs, Level 3 [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 4,206 | [1] |  |  | 4,235 | [2] |  |
Fair Value, Inputs, Level 3 [Member] | Investments in Venture Capital [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 4,831 |  |  |  | 4,922 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 2,493 |  |  |  | 6,317 |  |  |
Total losses/gains |  |  |  |  | 806 |  | 17 |
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 2,493 |  |  |  | 6,317 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 19,565 |  |  |  | 20,359 |  |  |
Total losses/gains |  |  | 56 |  | 598 |  | 3,914 |
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 19,565 |  |  |  | 20,359 |  |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | 11,971 |  |  |  | 13,009 |  |  |
Total losses/gains |  |  | $ 148 |  | 146 |  | $ 27 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Impaired loans by type: |  |  |  |  |  |  |  |
Fair value measurement | $ 11,971 |  |  |  | $ 13,009 |  |  |
[1] | Other real estate owned balance of $27.3 million in the condensed consolidated balance sheet is net of estimated disposal costs.
[2] | Other real estate owned balance of $24.7 million in the consolidated balance sheet is net of estimated disposal costs.

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