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Note 15 - Fair Value Measurements - Financial Assets and Liabilities Measured on a Non-recurring Basis (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Assets, fair value disclosure |  | $ 1,275,998,000 | $ 1,340,767,000 |
Total Losses |  | (289,000) | 874,000 | $ 1,307,000
Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 53,297,000 | 73,493,000 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, fair value disclosure |  | 149,849,000 | 277,622,000 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, fair value disclosure |  | 1,125,965,000 | 1,063,054,000 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 9,023,000 | 5,677,000 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, fair value disclosure |  | 184,000 | 91,000 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 44,274,000 | 67,816,000 |
Impaired Loans [Member] |  |  |  |
Total Losses |  |  | 25,000 | 322,000
Impaired Loans [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 37,769,000 | 60,911,000 |
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 37,769,000 | 60,911,000 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Total Losses |  |  | 25,000 | 322,000
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 4,733,000 | 18,097,000 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 4,733,000 | 18,097,000 |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Total Losses |  |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 26,186,000 | 31,459,000 |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 26,186,000 | 31,459,000 |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Assets, fair value disclosure |  | 6,850,000 | 11,355,000 |
Total Losses |  |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, fair value disclosure |  | 6,850,000 | 11,355,000 |
Other Real Estate Owned [Member] |  |  |  |
Total Losses | [1] | (619,000) | 457,000 | 9,000
Other Real Estate Owned [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure | [1] | 13,366,000 | 9,999,000 |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure | [1] |  |  |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure | [1] | 9,023,000 | 5,677,000 |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure | [1] | 4,343,000 | 4,322,000 |
Investments in Venture Capital [Member] |  |  |  |
Total Losses |  | 330,000 | 392,000 | $ 976,000
Investments in Venture Capital [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 2,162,000 | 2,583,000 |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  |  |  |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | $ 2,162,000 | $ 2,583,000 |
[1] | Other real estate owned balance of $12.7 million in the Consolidated Balance Sheets is net of estimated disposal costs.

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