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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Assets, fair value disclosure |  | $ 1,031,221 |  | $ 1,031,221 |  | $ 1,068,382
Fair Value, Nonrecurring [Member] |  |  |  |  |  |
Assets, fair value disclosure |  | 23,418 |  | 23,418 |  | 41,920
Total Losses |  | 111 | $ 452 | 182 | $ 821 |
Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |
Assets, fair value disclosure |  | 17,312 |  | 17,312 |  | 35,398
Total Losses |  | 0 | 0 | 0 | 0 |
Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |
Assets, fair value disclosure | [1] | 5,091 |  | 5,091 |  | 5,141
Total Losses | [1] | 47 | 381 | 47 | 717 |
Fair Value, Nonrecurring [Member] | Investments in Venture Capital and Private Company Stock [Member] |  |  |  |  |  |
Assets, fair value disclosure |  | 1,015 |  | 1,015 |  | 1,381
Total Losses |  | 64 | 71 | 135 | 104 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |  |
Assets, fair value disclosure |  | 60,580 |  | 60,580 |  | 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 | [1] | 0 |  | 0 |  | 0
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 |  | 970,619 |  | 970,619 |  | 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 | [1] | 0 |  | 0 |  | 0
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 |  | 23,418 |  | 23,418 |  | 41,920
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |
Assets, fair value disclosure |  | 17,312 |  | 17,312 |  | 35,398
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Other Real Estate Owned [Member] |  |  |  |  |  |
Assets, fair value disclosure | [1] | 5,091 |  | 5,091 |  | 5,141
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] | Investments in Venture Capital and Private Company Stock [Member] |  |  |  |  |  |
Assets, fair value disclosure |  | 1,015 |  | 1,015 |  | 1,381
Commercial Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |
Assets, fair value disclosure |  | 2,059 |  | 2,059 |  | 5,342
Total Losses |  | 0 | 0 | 0 | 0 |
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 |  | 2,059 |  | 2,059 |  | 5,342
Commercial Real Estate Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |
Assets, fair value disclosure |  | 11,742 |  | 11,742 |  | 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 |  | 11,742 |  | 11,742 |  | 25,749
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] | Loans Receivable [Member] |  |  |  |  |  |
Assets, fair value disclosure |  | 3,511 |  | 3,511 |  | 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 |  | $ 3,511 |  | $ 3,511 |  | $ 4,307
[1] | Other real estate owned balance of $4.9 million in the Consolidated Balance Sheets is net of estimated disposal costs.

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