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Note 6 - Allowance for Credit Losses - Changes in Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Balance, Loans $ 30,556 [1] $ 27,858
Balance, Allowance for credit losses - loan commitments 1,196 678
Total allowance for credit losses beginning of year 31,752 28,536
Provision for credit losses - loans 1,974  
(Recovery of) provision for credit losses - loan commitments (232) 98
Total provision for credit losses - loans and loan commitments 1,742 2,059
Charge-offs (2,570) (1,302)
Recoveries 829 464
Net recoveries (charge-offs) (1,741) (838)
Balance, Allowance for credit losses - loans 30,789 28,981
Balance, Allowance for credit losses - loan commitments 964 776
Ending balance 31,753 29,757
Provision for credit losses for loans 1,742 1,961
Commercial Portfolio Segment [Member]    
Balance, Loans 17,213 14,775
Balance, Allowance for credit losses - loan commitments 1,018 576
Total allowance for credit losses beginning of year 18,231 15,351
Provision for credit losses - loans 37  
(Recovery of) provision for credit losses - loan commitments (232) 87
Total provision for credit losses - loans and loan commitments (195) 1,195
Charge-offs (173) (257)
Recoveries 192 270
Net recoveries (charge-offs) 19 13
Balance, Allowance for credit losses - loans 17,269 15,896
Balance, Allowance for credit losses - loan commitments 786 663
Ending balance 18,055 16,559
Provision for credit losses for loans   1,108
Consumer Real Estate Portfolio Segment [Member]    
Balance, Loans 8,931 9,972
Balance, Allowance for credit losses - loan commitments 156 88
Total allowance for credit losses beginning of year 9,087 10,060
Provision for credit losses - loans 103  
(Recovery of) provision for credit losses - loan commitments (6) 6
Total provision for credit losses - loans and loan commitments 97 (235)
Charge-offs (98) (6)
Recoveries 59 39
Net recoveries (charge-offs) (39) 33
Balance, Allowance for credit losses - loans 8,995 9,764
Balance, Allowance for credit losses - loan commitments 150 94
Ending balance 9,145 9,858
Provision for credit losses for loans   (241)
Consumer and Other Portfolio Segment [Member]    
Balance, Loans 4,412 3,111
Balance, Allowance for credit losses - loan commitments 22 14
Total allowance for credit losses beginning of year 4,434 3,125
Provision for credit losses - loans 1,834  
(Recovery of) provision for credit losses - loan commitments 6 5
Total provision for credit losses - loans and loan commitments 1,840 1,099
Charge-offs (2,299) (1,039)
Recoveries 578 155
Net recoveries (charge-offs) (1,721) (884)
Balance, Allowance for credit losses - loans 4,525 3,321
Balance, Allowance for credit losses - loan commitments 28 19
Ending balance $ 4,553 3,340
Provision for credit losses for loans   $ 1,094
[1] Derived from audited financial statements