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Note 13 - Fair Value Measurements and Fair Value of Financial Instruments - Financial Assets and Liabilities Measured on a Non-recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Assets, fair value disclosure |  | $ 1,105,861 |  |  | $ 1,105,861 |  |  | $ 1,068,382 |
Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 27,418 |  |  | 27,418 |  |  | 41,920 |
Total Losses |  | (47) |  | $ 6,953 | 2,172 |  | $ 7,774 |  |
Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 20,914 |  |  | 20,914 |  |  | 35,398 |
Total Losses |  | 0 |  | 6,950 | 2,037 |  | 6,950 |  |
Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 5,497 | [1] |  | 5,497 | [1] |  | 5,141 | [2]
Total Losses | [1] | (55) |  | 0 | (8) |  | 717 |  |
Fair Value, Nonrecurring [Member] | Investments in Venture Capital and Private Company Stock [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 1,007 |  |  | 1,007 |  |  | 1,381 |
Total Losses |  | 8 |  | 3 | 143 |  | 107 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 60,328 |  |  | 60,328 |  |  | 104,692 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 | [1] |  | 0 | [1] |  | 0 | [2]
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Investments in Venture Capital and Private Company Stock [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 1,045,511 |  |  | 1,045,511 |  |  | 963,669 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 | [1] |  | 0 | [1] |  | 0 | [2]
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Investments in Venture Capital and Private Company Stock [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 22 |  |  | 22 |  |  | 21 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 27,468 |  |  | 27,468 |  |  | 41,920 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 20,964 |  |  | 20,964 |  |  | 35,398 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 5,497 | [1] |  | 5,497 | [1] |  | 5,141 | [2]
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Investments in Venture Capital and Private Company Stock [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 1,007 |  |  | 1,007 |  |  | 1,381 |
Commercial Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 5,355 |  |  | 5,355 |  |  | 5,342 |
Total Losses |  | 0 |  | 6,950 | 2,037 |  | 6,950 |  |
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 5,355 |  |  | 5,355 |  |  | 5,342 |
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 13,332 |  |  | 13,332 |  |  | 25,749 |
Total Losses |  | 0 |  | 0 | 0 |  | 0 |  |
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 13,332 |  |  | 13,332 |  |  | 25,749 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 2,227 |  |  | 2,227 |  |  | 4,307 |
Total Losses |  | 0 |  | $ 0 | 0 |  | $ 0 |  |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | 0 |  |  | 0 |  |  | 0 |
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |  |  |  |
Assets, fair value disclosure |  | $ 2,277 |  |  | $ 2,277 |  |  | $ 4,307 |
[1] | Other real estate owned balance of $5.3 million in the Consolidated Balance Sheets is net of estimated disposal costs.
[2] | Other real estate owned balance of $4.9 million in the Consolidated Balance Sheets is net of estimated disposal costs.

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