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Note 5 - Loans and the Allowance for Credit Losses - Impairment Evaluation on Loans and Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Individually analyzed | $ 0 | $ 941 |  |
Collectively evaluated | 82,609 | 80,616 |  |
Total | 82,869 | 81,974 | $ 87,002 | $ 90,513
Individually analyzed | 46,022 | 69,963 |  |
Collectively evaluated | 8,257,605 | 8,281,394 |  |
Total | 8,304,101 | 8,351,841 |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Individually analyzed | 260 | 417 |  |
Individually analyzed | 474 | 484 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Individually analyzed | 0 | 0 |  |
Collectively evaluated | 20,475 | 20,215 |  |
Total | 20,735 | 20,632 | 26,162 | 28,903
Individually analyzed | 11,980 | 15,336 |  |
Collectively evaluated | 1,560,040 | 1,562,910 |  |
Total | 1,572,494 | 1,578,730 |  |
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Individually analyzed | 260 | 417 |  |
Individually analyzed | 474 | 484 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Individually analyzed | 0 | 941 |  |
Collectively evaluated | 52,794 | 51,337 |  |
Total | 52,794 | 52,278 | 53,000 | 53,742
Individually analyzed | 33,210 | 39,986 |  |
Collectively evaluated | 5,796,740 | 5,855,559 |  |
Total | 5,829,950 | 5,895,545 |  |
Commercial Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Individually analyzed | 0 | 0 |  |
Individually analyzed | 0 | 0 |  |
Commercial Construction Portfolio Segment [Member] |  |  |  |
Individually analyzed | 0 | 0 |  |
Collectively evaluated | 5,011 | 4,739 |  |
Total | 5,011 | 4,739 | 3,966 | 3,718
Individually analyzed | 0 | 8,700 |  |
Collectively evaluated | 646,593 | 611,796 |  |
Total | 646,593 | 620,496 |  |
Commercial Construction Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Individually analyzed | 0 | 0 |  |
Individually analyzed | 0 | 0 |  |
Residential Portfolio Segment [Member] |  |  |  |
Individually analyzed | 0 | 0 |  |
Collectively evaluated | 4,326 | 4,320 |  |
Total | 4,326 | 4,320 | 3,868 | 4,143
Individually analyzed | 832 | 5,941 |  |
Collectively evaluated | 253,382 | 250,100 |  |
Total | 254,214 | 256,041 |  |
Residential Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Individually analyzed | 0 | 0 |  |
Individually analyzed | 0 | 0 |  |
Consumer Portfolio Segment [Member] |  |  |  |
Individually analyzed | 0 | 0 |  |
Collectively evaluated | 3 | 5 |  |
Total | 3 | 5 | $ 6 | $ 7
Individually analyzed | 0 | 0 |  |
Collectively evaluated | 850 | 1,029 |  |
Total | 850 | 1,029 |  |
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Individually analyzed | 0 | 0 |  |
Individually analyzed | $ 0 | $ 0 |  |

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