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Note 8 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Balance $ 173,531 $ 153,403 $ 161,765 $ 154,562 $ 154,562
Provision/(reversal) for expected credit losses 28,762 14,532 55,246 22,511  
Charge-offs (16,487) (4,478) (31,861) (14,928) (31,472)
Recoveries 841 276 1,497 1,588  
Net (charge-offs)/recoveries (15,646) (4,202) (30,364) (13,340)  
Balance 186,647 163,733 186,647 163,733 161,765
Commitments to Extend Credit [Member]          
Balance 9,892 9,574 9,676 9,053 9,053
Provision/(reversal) for expected credit losses (31) (32) 185 489  
Balance 9,861 9,542 9,861 9,542 9,676
Commercial Portfolio Segment [Member]          
Balance 40,842 48,588 57,796 53,791 53,791
Provision/(reversal) for expected credit losses 13,855 4,872 7,897 8,927  
Charge-offs (16,173) (2,666) (27,634) (12,862) (26,926)
Recoveries 547 88 1,012 1,026  
Net (charge-offs)/recoveries (15,626) (2,578) (26,622) (11,836)  
Balance 39,071 50,882 39,071 50,882 57,796
Commercial Portfolio Segment [Member] | Commitments to Extend Credit [Member]          
Balance 7,590 7,493 7,780 6,888 6,888
Provision/(reversal) for expected credit losses (872) 208 (1,062) 813  
Balance 6,718 7,701 6,718 7,701 7,780
Real Estate Construction Portfolio Segment [Member]          
Balance 5,434 8,912 8,185 8,180 8,180
Provision/(reversal) for expected credit losses 966 (402) (1,786) 330  
Charge-offs 0 0 0 0 0
Recoveries 5 0 6 0  
Net (charge-offs)/recoveries 5 0 6 0  
Balance 6,405 8,510 6,405 8,510 8,185
Real Estate Construction Portfolio Segment [Member] | Commitments to Extend Credit [Member]          
Balance 2,248 2,081 1,896 2,165 2,165
Provision/(reversal) for expected credit losses 698 (240) 1,050 (324)  
Balance 2,946 1,841 2,946 1,841 1,896
Commercial Real Estate Portfolio Segment [Member]          
Balance 106,773 78,465 79,597 74,428 74,428
Provision/(reversal) for expected credit losses 11,054 8,444 41,889 12,731  
Charge-offs (314) (1,746) (4,153) (1,997) (4,469)
Recoveries 285 180 465 181  
Net (charge-offs)/recoveries (29) (1,566) (3,688) (1,816)  
Balance 117,798 85,343 117,798 85,343 79,597
Commercial Real Estate Portfolio Segment [Member] | Commitments to Extend Credit [Member]          
Balance 54 0 0 0 0
Provision/(reversal) for expected credit losses 143 0 197 0  
Balance 197 0 197 0 0
Residential Mortgage and Equity Lines Portfolio Segment [Member]          
Balance 20,465 17,415 16,181 18,140 18,140
Provision/(reversal) for expected credit losses 2,892 1,554 7,240 459  
Charge-offs 0 (59) (74) (62)  
Recoveries 4 7 14 380  
Net (charge-offs)/recoveries 4 (52) (60) 318  
Balance 23,361 18,917 23,361 18,917 16,181
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Commitments to Extend Credit [Member]          
Balance 0 0 0 0 0
Provision/(reversal) for expected credit losses 0 0 0 0  
Balance 0 0 0 0 0
Installment and Other Loans [Member ]          
Balance 17 23 6 23 23
Provision/(reversal) for expected credit losses (5) 64 6 64  
Charge-offs 0 (7) 0 (7) (15)
Recoveries 0 1 0 1  
Net (charge-offs)/recoveries 0 (6) 0 (6)  
Balance 12 81 12 81 6
Installment and Other Loans [Member ] | Commitments to Extend Credit [Member]          
Balance 0 0 0 0 0
Provision/(reversal) for expected credit losses 0 0 0 0  
Balance $ 0 $ 0 $ 0 $ 0 $ 0