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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Balance $ 153,403 $ 155,109 $ 154,562 $ 146,485 $ 146,485
Provision/(reversal) for expected credit losses 14,532 6,121 22,511 21,581  
Charge-offs (4,478) (7,483) (14,928) (17,873) (23,486)
Recoveries 276 872 1,588 4,426  
Net (charge-offs) (4,202) (6,611) (13,340) (13,447)  
Balance 163,733 154,619 163,733 154,619 154,562
Commitments to Extend Credit [Member]          
Balance 9,574 10,525 9,053 8,730 8,730
Provision/(reversal) for expected credit losses (32) 879 489 2,674  
Balance 9,542 11,404 9,542 11,404 9,053
Commercial Portfolio Segment [Member]          
Balance 48,588 50,579 53,791 49,435 49,435
Provision/(reversal) for expected credit losses 4,872 (178) 8,927 6,276  
Charge-offs (2,666) (6,254) (12,862) (12,517) (13,909)
Recoveries 88 611 1,026 1,564  
Net (charge-offs) (2,578) (5,643) (11,836) (10,953)  
Balance 50,882 44,758 50,882 44,758 53,791
Commercial Portfolio Segment [Member] | Commitments to Extend Credit [Member]          
Balance 7,493 6,984 6,888 4,840 4,840
Provision/(reversal) for expected credit losses 208 1,570 813 3,714  
Balance 7,701 8,554 7,701 8,554 6,888
Real Estate Construction Portfolio Segment [Member]          
Balance 8,912 12,751 8,180 10,417 10,417
Provision/(reversal) for expected credit losses (402) 2,360 330 4,694  
Charge-offs 0 0 0 0 (4,221)
Recoveries 0 0 0 0  
Net (charge-offs) 0 0 0 0  
Balance 8,510 15,111 8,510 15,111 8,180
Real Estate Construction Portfolio Segment [Member] | Commitments to Extend Credit [Member]          
Balance 2,081 3,541 2,165 3,890 3,890
Provision/(reversal) for expected credit losses (240) (691) (324) (1,040)  
Balance 1,841 2,850 1,841 2,850 2,165
Commercial Real Estate Portfolio Segment [Member]          
Balance 78,465 73,547 74,428 68,366 68,366
Provision/(reversal) for expected credit losses 8,444 3,307 12,731 10,027  
Charge-offs (1,746) (1,221) (1,997) (5,341) (5,341)
Recoveries 180 252 181 2,833  
Net (charge-offs) (1,566) (969) (1,816) (2,508)  
Balance 85,343 75,885 85,343 75,885 74,428
Commercial Real Estate 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
Residential Mortgage and Equity Lines Portfolio Segment [Member]          
Balance 17,415 18,214 18,140 18,232 18,232
Provision/(reversal) for expected credit losses 1,554 586 459 548  
Charge-offs (59) 0 (62) 0  
Recoveries 7 9 380 29  
Net (charge-offs) (52) 9 318 29  
Balance 18,917 18,809 18,917 18,809 18,140
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 23 18 23 35 35
Provision/(reversal) for expected credit losses 64 46 64 36  
Charge-offs (7) (8) (7) (15) (15)
Recoveries 1 0 1 0  
Net (charge-offs) (6) (8) (6) (15)  
Balance 81 56 81 56 23
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