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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 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | --- | --- | --- | --- | ---
Individually analyzed, allowance for credit losses | $ 1,707 |  | $ 941 |  |  |
Collectively evaluated | 80,541 |  | 80,616 |  |  |
Total | 82,494 | $ 82,077 | 81,974 | $ 88,230 | $ 89,205 | $ 90,513
Individually analyzed, gross loans | 50,063 |  | 69,963 |  |  |
Collectively evaluated | 8,065,814 |  | 8,281,394 |  |  |
Total | 8,116,332 |  | 8,351,841 |  |  |
Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |
Individually analyzed, allowance for credit losses | 246 |  | 417 |  |  |
Individually analyzed, gross loans | 455 |  | 484 |  |  |
Commercial Portfolio Segment [Member] |  |  |  |  |  |
Individually analyzed, allowance for credit losses | 333 |  | 0 |  |  |
Collectively evaluated | 19,238 |  | 20,215 |  |  |
Total | 19,817 | 20,020 | 20,632 | 27,851 | 29,326 | 28,903
Individually analyzed, gross loans | 12,027 |  | 15,336 |  |  |
Collectively evaluated | 1,501,509 |  | 1,562,910 |  |  |
Total | 1,513,991 |  | 1,578,730 |  |  |
Commercial Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |
Individually analyzed, allowance for credit losses | 246 |  | 417 |  |  |
Individually analyzed, gross loans | 455 |  | 484 |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |  |  |  |
Individually analyzed, allowance for credit losses | 1,374 |  | 941 |  |  |
Collectively evaluated | 52,699 |  | 51,337 |  |  |
Total | 54,073 | 53,098 | 52,278 | 52,733 | 52,509 | 53,742
Individually analyzed, gross loans | 33,219 |  | 39,986 |  |  |
Collectively evaluated | 5,701,951 |  | 5,855,559 |  |  |
Total | 5,735,170 |  | 5,895,545 |  |  |
Commercial Real Estate Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |
Individually analyzed, allowance for credit losses | 0 |  | 0 |  |  |
Individually analyzed, gross loans | 0 |  | 0 |  |  |
Commercial Construction Portfolio Segment [Member] |  |  |  |  |  |
Individually analyzed, allowance for credit losses | 0 |  | 0 |  |  |
Collectively evaluated | 4,165 |  | 4,739 |  |  |
Total | 4,165 | 4,472 | 4,739 | 3,909 | 3,546 | 3,718
Individually analyzed, gross loans | 2,204 |  | 8,700 |  |  |
Collectively evaluated | 613,883 |  | 611,796 |  |  |
Total | 616,087 |  | 620,496 |  |  |
Commercial Construction Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |
Individually analyzed, allowance for credit losses | 0 |  | 0 |  |  |
Individually analyzed, gross loans | 0 |  | 0 |  |  |
Residential Portfolio Segment [Member] |  |  |  |  |  |
Individually analyzed, allowance for credit losses | 0 |  | 0 |  |  |
Collectively evaluated | 4,436 |  | 4,320 |  |  |
Total | 4,436 | 4,484 | 4,320 | 3,732 | 3,819 | 4,143
Individually analyzed, gross loans | 2,613 |  | 5,941 |  |  |
Collectively evaluated | 247,636 |  | 250,100 |  |  |
Total | 250,249 |  | 256,041 |  |  |
Residential Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |
Individually analyzed, allowance for credit losses | 0 |  | 0 |  |  |
Individually analyzed, gross loans | 0 |  | 0 |  |  |
Consumer Portfolio Segment [Member] |  |  |  |  |  |
Individually analyzed, allowance for credit losses | 0 |  | 0 |  |  |
Collectively evaluated | 3 |  | 5 |  |  |
Total | 3 | $ 3 | 5 | $ 5 | $ 5 | $ 7
Individually analyzed, gross loans | 0 |  | 0 |  |  |
Collectively evaluated | 835 |  | 1,029 |  |  |
Total | 835 |  | 1,029 |  |  |
Consumer Portfolio Segment [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |  |
Individually analyzed, allowance for credit losses | 0 |  | 0 |  |  |
Individually analyzed, gross loans | $ 0 |  | $ 0 |  |  |

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