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Note 6 - Loans and the Allowance for Credit Losses - Activity in the ACL for Loans (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Balance $ 82,077 $ 89,205 $ 81,974 $ 90,513 $ 90,513
Charge-offs (3,559) (2,487) (10,339) (8,089) (17,049)
Recoveries 53 8 400 85  
Provision for (reversal of) credit losses - loans 3,923 1,504 10,459 5,721  
Balance 82,494 88,230 82,494 88,230 81,974
Commercial Portfolio Segment [Member]          
Balance 20,020 29,326 20,632 28,903 28,903
Charge-offs (1,923) (2,250) (2,223) (6,117) (14,888)
Recoveries 22 0 369 9  
Provision for (reversal of) credit losses - loans 1,698 775 1,039 5,056  
Balance 19,817 27,851 19,817 27,851 20,632
Commercial Real Estate Portfolio Segment [Member]          
Balance 53,098 52,509 52,278 53,742 53,742
Charge-offs (1,636) (237) (8,116) (1,954) (2,142)
Recoveries 31 0 31 0  
Provision for (reversal of) credit losses - loans 2,580 461 9,880 945  
Balance 54,073 52,733 54,073 52,733 52,278
Commercial Construction Portfolio Segment [Member]          
Balance 4,472 3,546 4,739 3,718 3,718
Charge-offs 0 0 0 0 0
Recoveries 0 0 0 0  
Provision for (reversal of) credit losses - loans (307) 363 (574) 191  
Balance 4,165 3,909 4,165 3,909 4,739
Residential Portfolio Segment [Member]          
Balance 4,484 3,819 4,320 4,143 4,143
Charge-offs 0 0 0 (18) (18)
Recoveries 0 1 0 69  
Provision for (reversal of) credit losses - loans (48) (88) 116 (462)  
Balance 4,436 3,732 4,436 3,732 4,320
Consumer Portfolio Segment [Member]          
Balance 3 5 5 7 7
Charge-offs 0 0 0 0 (1)
Recoveries 0 7 0 7  
Provision for (reversal of) credit losses - loans 0 (7) (2) (9)  
Balance $ 3 $ 5 $ 3 $ 5 $ 5