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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, 2020 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018
Assets, fair value disclosure | $ 1,378,354 |  |  |  | $ 1,484,478 |  |  |
Total Losses | 369 |  | $ 74 |  | 848 |  | $ (289) |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 42,908 |  |  |  | 49,519 |  |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 18,790 |  |  |  | 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 | 1,359,540 |  |  |  | 1,381,498 |  |  |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 5,225 |  |  |  | 6,490 |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 24 |  |  |  | 39 |  |  |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 37,683 |  |  |  | 43,029 |  |  |
Impaired Loans [Member] |  |  |  |  |  |  |  |
Total Losses | 0 |  | 0 |  | 0 |  | 0 |
Impaired Loans [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 31,926 |  |  |  | 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 | 31,926 |  |  |  | 37,082 |  |  |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |  |  |  |
Total Losses | 0 |  | 0 |  | 0 |  | 0 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 6,325 |  |  |  | 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 | 6,325 |  |  |  | 6,196 |  |  |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |  |  |
Total Losses | 0 |  | 0 |  | 0 |  | 0 |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 20,015 |  |  |  | 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 | 20,015 |  |  |  | 25,566 |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |  |  |  |  |
Total Losses | 0 |  | 0 |  | 0 |  | 0 |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 5,586 |  |  |  | 5,320 |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 0 |  |  |  | 0 |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 0 |  |  |  | 0 |  |  |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 5,586 |  |  |  | 5,320 |  |  |
Other Real Estate Owned [Member] |  |  |  |  |  |  |  |
Total Losses | 336 | [1] | 72 | [1] | 681 | [2] | (619) | [2]
Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 9,463 | [1] |  |  | 10,833 | [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 | 5,225 | [1] |  |  | 6,490 | [2] |  |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 4,238 | [1] |  |  | 4,343 | [2] |  |
Investments in Venture Capital [Member] |  |  |  |  |  |  |  |
Total Losses | 33 |  | $ 2 |  | 167 |  | $ 330 |
Investments in Venture Capital [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |
Assets, fair value disclosure | 1,519 |  |  |  | 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 | $ 1,519 |  |  |  | $ 1,604 |  |  |
[1] | Other real estate owned balance of $9.0 million in the condensed consolidated balance sheet is net of estimated disposal costs.
[2] | Other real estate owned balance of $10.2 million in the Consolidated Balance Sheets is net of estimated disposal costs.

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