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Note 12 - 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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Total at Fair Value |  | $ 1,740,019 |  | $ 1,699,623 |
Total Losses |  | 1,289 | $ 6,783 | 4,296 | $ 4,145
Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 40,670 |  | 27,756 |
Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Total at Fair Value |  | 573,178 |  | 535,706 |
Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 0 |  | 0 |
Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Total at Fair Value |  | 1,166,841 |  | 1,163,917 |
Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Total at Fair Value |  | 0 |  | 0 |
Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 40,670 |  | 27,756 |
Impaired Loans [Member] |  |  |  |  |
Total Losses |  | 1,289 | 6,783 | 4,069 | 3,877
Impaired Loans [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 20,131 |  | 7,073 |
Impaired Loans [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 0 |  | 0 |
Impaired Loans [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 0 |  | 0 |
Impaired Loans [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 20,131 |  | 7,073 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] |  |  |  |  |
Total Losses |  | 1,038 | 2,793 | 0 | 1,786
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 129 |  | 191 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 0 |  | 0 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 0 |  | 0 |
Impaired Loans [Member] | Commercial Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 129 |  | 191 |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |
Total Losses |  | 251 | 3,990 | 4,069 | 2,091
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 20,002 |  | 6,882 |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 0 |  | 0 |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 0 |  | 0 |
Impaired Loans [Member] | Commercial Real Estate Portfolio Segment [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 20,002 |  | 6,882 |
Other Real Estate Owned [Member] |  |  |  |  |
Total Losses | [1] | 0 | 0 | 0 | 0
Other Real Estate Owned [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value | [1] | 20,446 |  | 20,446 |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value | [1] | 0 |  | 0 |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value | [1] | 0 |  | 0 |
Other Real Estate Owned [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value | [1] | 20,446 |  | 20,446 |
Investments in Venture Capital [Member] |  |  |  |  |
Total Losses |  | 0 | $ 0 | 227 | $ 268
Investments in Venture Capital [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 93 |  | 237 |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 0 |  | 0 |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | 0 |  | 0 |
Investments in Venture Capital [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Nonrecurring [Member] |  |  |  |  |
Total at Fair Value |  | $ 93 |  | $ 237 |
[1] | Other real estate owned balance of $19.4 million in the Consolidated Balance Sheets is net of estimated disposal costs.

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