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Note 17 - 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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Assets, fair value disclosure |  | $ 1,699,623 | $ 1,540,447 |
Total Losses |  | 4,296 | 4,145 | $ 1,172
Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 27,756 | 59,158 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, fair value disclosure |  | 535,706 | 262,658 |
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 |  | 1,163,917 | 1,277,739 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 0 | 0 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, fair value disclosure |  | 0 | 50 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 27,756 | 59,158 |
Impaired Loans [Member] |  |  |  |
Total Losses |  | 4,069 | 3,877 | 1,012
Impaired Loans [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 7,073 | 54,141 |
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 |  | 7,073 | 54,141 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |
Total Losses |  | 0 | 1,786 | 1,012
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 191 | 12,950 |
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 |  | 191 | 12,950 |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Total Losses |  | 4,069 | 2,091 | 0
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 6,882 | 32,205 |
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 |  | 6,882 | 32,205 |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] |  |  |  |
Assets, fair value disclosure |  |  | 8,978 |
Total Losses |  |  | 0 | 0
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, fair value disclosure |  |  | 0 |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, fair value disclosure |  |  | 0 |
Impaired Loans [Member] | Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, fair value disclosure |  |  | 8,978 |
Impaired Loans [Member] | Installment and Other Loans [Member ] |  |  |  |
Assets, fair value disclosure |  |  | 8 |
Total Losses |  |  | 0 | 0
Impaired Loans [Member] | Installment and Other Loans [Member ] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, fair value disclosure |  |  | 0 |
Impaired Loans [Member] | Installment and Other Loans [Member ] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, fair value disclosure |  |  | 0 |
Impaired Loans [Member] | Installment and Other Loans [Member ] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, fair value disclosure |  |  | 8 |
Other Real Estate Owned [Member] |  |  |  |
Total Losses | [1] | 0 | 0 | 17
Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure | [1] | 20,446 | 4,328 |
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] | 0 | 0 |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure | [1] | 20,446 | 4,328 |
Investments in Venture Capital [Member] |  |  |  |
Total Losses |  | 227 | 268 | $ 143
Investments in Venture Capital [Member] | Fair Value, Nonrecurring [Member] |  |  |  |
Assets, fair value disclosure |  | 237 | 689 |
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 |  | $ 237 | $ 689 |
[1] | Other real estate owned balance of $14.4 million in the Consolidated Balance Sheets is net of estimated disposal costs.

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