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Note 15 - Fair Value Measurements and Fair Value of Financial Instruments - Financial Assets and Liabilities Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Assets, fair value disclosure |  | $ 1,068,382 | $ 1,484,478 |
Total Losses |  | 7,836 | 848 | $ (289)
Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 41,920 | 49,519 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, fair value disclosure |  | 104,692 | 102,941 |
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 |  | 963,669 | 1,381,498 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 905 | 6,490 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, fair value disclosure |  | 21 | 39 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 41,015 | 43,029 |
Impaired Loans [Member] |  |  |  |
Total Losses |  | 7,012 | 0 | 0
Impaired Loans [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 35,398 | 37,082 |
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 |  | 35,398 | 37,082 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Total Losses |  | 7,012 | 0 | 0
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 5,342 | 6,196 |
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 |  | 5,342 | 6,196 |
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 |  | 25,749 | 25,566 |
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 |  | 25,749 | 25,566 |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Assets, fair value disclosure |  | 4,307 | 5,320 |
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 |  | 4,307 | 5,320 |
Other Real Estate Owned [Member] |  |  |  |
Total Losses | [1] | 717 | 681 | (619)
Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure | [1] | 5,141 | 10,833 |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure | [1] | 0 | 0 |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure | [1] | 905 | 6,490 |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure | [1] | 4,236 | 4,343 |
Investments in Venture Capital [Member] |  |  |  |
Total Losses |  | 107 | 167 | $ 330
Investments in Venture Capital [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 1,381 | 1,604 |
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 |  | $ 1,381 | $ 1,604 |
[1] | Other real estate owned balance of $10.2 million in the Consolidated Balance Sheets is net of estimated disposal costs.

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