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Note 15 - Fair Value Measurements - Financial Assets and Liabilities Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Assets, fair value disclosure | $ 1,484,478 |  | $ 1,275,998 |  |  |
Total Losses | 848 |  | (289) |  | $ 874 |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 49,519 |  | 53,297 |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Assets, fair value disclosure | 102,941 |  | 149,849 |  |  |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 0 |  | 0 |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Assets, fair value disclosure | 1,381,498 |  | 1,125,965 |  |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 6,490 |  | 9,023 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Assets, fair value disclosure | 39 |  | 184 |  |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 43,029 |  | 44,274 |  |  |
Impaired Loans [Member] |  |  |  |  |  |
Total Losses | 0 |  | 0 |  | 25 |
Impaired Loans [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 37,082 |  | 37,769 |  |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 0 |  | 0 |  |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 0 |  | 0 |  |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 37,082 |  | 37,769 |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |
Total Losses | 0 |  | 0 |  | 25 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 6,196 |  | 4,733 |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 0 |  | 0 |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 0 |  | 0 |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 6,196 |  | 4,733 |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Total Losses | 0 |  | 0 |  | 0 |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 25,566 |  | 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 | 0 |  | 0 |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 0 |  | 0 |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 25,566 |  | 26,186 |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |  |  |
Assets, fair value disclosure | 5,320 |  | 6,850 |  |  |
Total Losses | 0 |  | 0 |  | 0 |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Assets, fair value disclosure | 0 |  | 0 |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |
Assets, fair value disclosure | 0 |  | 0 |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |
Assets, fair value disclosure | 5,320 |  | 6,850 |  |  |
Other Real Estate Owned [Member] |  |  |  |  |  |
Total Losses | 681 | [1] | (619) | [1],[2] | 457 | [2]
Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 10,833 | [1] | 13,366 | [2] |  |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 0 | [1] | 0 | [2] |  |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 6,490 | [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 | 167 |  | 330 |  | $ 392 |
Investments in Venture Capital [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 1,604 |  | 2,162 |  |  |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 0 |  | 0 |  |  |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | 0 |  | 0 |  |  |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure | $ 1,604 |  | $ 2,162 |  |  |
[1] | Other real estate owned balance of $10.2 million in the Consolidated Balance Sheets is net of estimated disposal costs.
[2] | Other real estate owned balance of $12.7 million in the Consolidated Balance Sheets is net of estimated disposal costs.

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