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Note 8 - Loans - Allowance for Loan Losses by Portfolio Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Balance $ 161,765 $ 154,562 $ 154,562
Provision/(reversal) for expected credit losses 14,148 1,167  
Charge-offs (2,344) (2,193) (31,472)
Recoveries 367 1,053  
Net (charge-offs) (1,977) (1,140)  
Balance 173,936 154,589 161,765
Commitments to Extend Credit [Member]      
Balance 9,676 9,053 9,053
Provision/(reversal) for expected credit losses 1,352 733  
Balance 11,028 9,786 9,676
Commercial Portfolio Segment [Member]      
Balance 57,796 53,791 53,791
Provision/(reversal) for expected credit losses 13,301 (1,374)  
Charge-offs (2,344) (1,939) (26,926)
Recoveries 270 812  
Net (charge-offs) (2,074) (1,127)  
Balance 69,023 51,290 57,796
Commercial Portfolio Segment [Member] | Commitments to Extend Credit [Member]      
Balance 7,780 6,888 6,888
Provision/(reversal) for expected credit losses 1,277 572  
Balance 9,057 7,460 7,780
Real Estate Construction Portfolio Segment [Member]      
Balance 8,185 8,180 8,180
Provision/(reversal) for expected credit losses 355 359  
Charge-offs 0 0 0
Recoveries 0 0  
Net (charge-offs) 0 0  
Balance 8,540 8,539 8,185
Real Estate Construction Portfolio Segment [Member] | Commitments to Extend Credit [Member]      
Balance 1,896 2,165 2,165
Provision/(reversal) for expected credit losses 75 161  
Balance 1,971 2,326 1,896
Commercial Real Estate Portfolio Segment [Member]      
Balance 79,597 74,428 74,428
Provision/(reversal) for expected credit losses 1,214 2,872  
Charge-offs 0 (251) (4,469)
Recoveries 90 0  
Net (charge-offs) 90 (251)  
Balance 80,901 77,049 79,597
Commercial Real Estate Portfolio Segment [Member] | Commitments to Extend Credit [Member]      
Balance 0 0 0
Provision/(reversal) for expected credit losses 0 0  
Balance 0 0 0
Residential Mortgage and Equity Lines Portfolio Segment [Member]      
Balance 16,181 18,140 18,140
Provision/(reversal) for expected credit losses (733) (677)  
Charge-offs 0 (3)  
Recoveries 7 241  
Net (charge-offs) 7 238  
Balance 15,455 17,701 16,181
Residential Mortgage and Equity Lines Portfolio Segment [Member] | Commitments to Extend Credit [Member]      
Balance 0 0 0
Provision/(reversal) for expected credit losses 0 0  
Balance 0 0 0
Installment and Other Loans [Member ]      
Balance 6 23 23
Provision/(reversal) for expected credit losses 11 (13)  
Charge-offs 0 0 (15)
Recoveries 0 0  
Net (charge-offs) 0 0  
Balance 17 10 6
Installment and Other Loans [Member ] | Commitments to Extend Credit [Member]      
Balance 0 0 0
Provision/(reversal) for expected credit losses 0 0  
Balance $ 0 $ 0 $ 0