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Note 13 - Fair Value Measurements - Financial Assets and Liabilities Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Assets, fair value disclosure | $ 1,344,234 |  |  |  | $ 1,275,998 |  |  |
Total Losses | 74 |  | $ 206 |  | (289) |  | $ 874 |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 41,238 |  |  |  | 53,297 |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 178,501 |  |  |  | 149,849 |  |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 1,165,552 |  |  |  | 1,125,965 |  |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 8,850 |  |  |  | 9,023 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 181 |  |  |  | 184 |  |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 32,388 |  |  |  | 44,274 |  |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |  |  |  |  |
Total Losses |  |  |  |  |  |  |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 5,973 |  |  |  | 6,850 |  |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 5,973 |  |  |  | 6,850 |  |  |
Impaired Loans [Member] |  |  |  |  |  |  |  |
Total Losses |  |  |  |  |  |  | 25 |
Impaired Loans [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 25,984 |  |  |  | 37,769 |  |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 25,984 |  |  |  | 37,769 |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |
Total Losses |  |  |  |  |  |  | 25 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 440 |  |  |  | 4,733 |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 440 |  |  |  | 4,733 |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |
Total Losses |  |  |  |  |  |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 19,571 |  |  |  | 26,186 |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 19,571 |  |  |  | 26,186 |  |  |
Other Real Estate Owned [Member] |  |  |  |  |  |  |  |
Total Losses | 72 | [1] | 33 | [1] | (619) | [2] | 457 | [2]
Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 13,193 | [1] |  |  | 13,366 | [2] |  |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | [1] |  |  |  | [2] |  |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 8,850 | [1] |  |  | 9,023 | [2] |  |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 4,343 | [1] |  |  | 4,343 | [2] |  |
Investments in Venture Capital [Member] |  |  |  |  |  |  |  |
Total Losses | 2 |  | $ 173 |  | 330 |  | $ 392 |
Investments in Venture Capital [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 2,061 |  |  |  | 2,162 |  |  |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure |  |  |  |  |  |  |  |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | $ 2,061 |  |  |  | $ 2,162 |  |  |
[1] | Other real estate owned balance of $12.5 million in the condensed consolidated balance sheet is net of estimated disposal costs.
[2] | Other real estate owned balance of $12.7 million in the condensed consolidated balance sheet is net of estimated disposal costs.

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