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Note 6 - Loans and the Allowance for Credit Losses - Impairment Evaluation on Loans and Allowance for Credit Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | ---
Individually analyzed, allowance for credit loss | $ 356 | $ 1,235 |  |
Collectively evaluated, allowance for credit loss | 81,874 | 81,238 |  |
Less: Allowance for credit losses - loans | 82,403 | 82,685 | $ 82,869 | $ 81,974
Individually analyzed, gross loans | 48,953 | 56,497 |  |
Collectively evaluated, gross loans | 8,156,977 | 8,223,563 |  |
Gross loans | 8,206,343 | 8,280,482 |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Less: Allowance for credit losses - loans | 173 | 212 |  |
Gross loans | 413 | 422 |  |
Commercial Portfolio Segment [Member] |  |  |  |
Individually analyzed, allowance for credit loss | 323 | 326 |  |
Collectively evaluated, allowance for credit loss | 17,535 | 17,740 |  |
Less: Allowance for credit losses - loans | 18,031 | 18,278 | 20,735 | 20,632
Individually analyzed, gross loans | 15,599 | 15,751 |  |
Collectively evaluated, gross loans | 1,476,908 | 1,516,557 |  |
Gross loans | 1,492,920 | 1,532,730 |  |
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Less: Allowance for credit losses - loans | 173 | 212 |  |
Gross loans | 413 | 422 |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |
Individually analyzed, allowance for credit loss | 33 | 909 |  |
Collectively evaluated, allowance for credit loss | 54,553 | 53,868 |  |
Less: Allowance for credit losses - loans | 54,586 | 54,777 | 52,794 | 52,278
Individually analyzed, gross loans | 29,109 | 36,486 |  |
Collectively evaluated, gross loans | 5,808,562 | 5,844,193 |  |
Gross loans | 5,837,671 | 5,880,679 |  |
Commercial Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Less: Allowance for credit losses - loans | 0 | 0 |  |
Gross loans | 0 | 0 |  |
Commercial Construction Portfolio Segment [Member] |  |  |  |
Individually analyzed, allowance for credit loss | 0 | 0 |  |
Collectively evaluated, allowance for credit loss | 5,030 | 5,064 |  |
Less: Allowance for credit losses - loans | 5,030 | 5,064 | 5,011 | 4,739
Individually analyzed, gross loans | 2,204 | 2,204 |  |
Collectively evaluated, gross loans | 615,389 | 614,042 |  |
Gross loans | 617,593 | 616,246 |  |
Commercial Construction Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Less: Allowance for credit losses - loans | 0 | 0 |  |
Gross loans | 0 | 0 |  |
Residential Portfolio Segment [Member] |  |  |  |
Individually analyzed, allowance for credit loss | 0 | 0 |  |
Collectively evaluated, allowance for credit loss | 4,752 | 4,561 |  |
Less: Allowance for credit losses - loans | 4,752 | 4,561 | 4,326 | 4,320
Individually analyzed, gross loans | 2,041 | 2,056 |  |
Collectively evaluated, gross loans | 254,514 | 247,635 |  |
Gross loans | 256,555 | 249,691 |  |
Residential Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Less: Allowance for credit losses - loans | 0 | 0 |  |
Gross loans | 0 | 0 |  |
Consumer Portfolio Segment [Member] |  |  |  |
Individually analyzed, allowance for credit loss | 0 | 0 |  |
Collectively evaluated, allowance for credit loss | 4 | 5 |  |
Less: Allowance for credit losses - loans | 4 | 5 | $ 3 | $ 5
Individually analyzed, gross loans | 0 | 0 |  |
Collectively evaluated, gross loans | 1,604 | 1,136 |  |
Gross loans | 1,604 | 1,136 |  |
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |
Less: Allowance for credit losses - loans | 0 | 0 |  |
Gross loans | $ 0 | $ 0 |  |

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