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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Recorded investment with no allowance $ 1,973   $ 1,973   $ 2,027
Unpaid principal balance with no allowance 2,167   2,167   2,172
Average recorded investment with no allowance 1,861 $ 2,582 1,853 $ 2,834  
Interest income recognized with no allowance 10 16 36 51  
Recorded investment with allowance 0   0   288
Unpaid principal balance with allowance 0   0   296
Related allowance 0   0   7
Average recorded investment with allowance 157 315 229 230  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 1,973   1,973   2,315
Unpaid principal balance 2,167   2,167   2,468
Average recorded investment 2,018 2,897 2,082 3,064  
Interest income recognized 10 16 36 51  
Related allowance with no allowance         0
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]          
Recorded investment with no allowance 894   894   1,034
Unpaid principal balance with no allowance 1,053   1,053   1,163
Average recorded investment with no allowance 891 1,503 903 1,653  
Interest income recognized with no allowance 2 6 9 18  
Recorded investment with allowance 0   0   0
Unpaid principal balance with allowance 0   0   0
Related allowance 0   0   0
Average recorded investment with allowance 15 0 14 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 894   894   1,034
Unpaid principal balance 1,053   1,053   1,163
Average recorded investment 906 1,503 917 1,653  
Interest income recognized 2 6 9 18  
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]          
Recorded investment with no allowance 51   51   102
Unpaid principal balance with no allowance 51   51   104
Average recorded investment with no allowance 51 100 76 99  
Interest income recognized with no allowance 0 0 0 0  
Recorded investment with allowance 0   0   0
Unpaid principal balance with allowance 0   0   0
Related allowance 0   0   0
Average recorded investment with allowance 0 26 0 13  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 51   51   102
Unpaid principal balance 51   51   104
Average recorded investment 51 126 76 112  
Interest income recognized 0 0 0 0  
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]          
Recorded investment with no allowance 0   0   0
Unpaid principal balance with no allowance 0   0   0
Average recorded investment with no allowance 0 0 0 0  
Interest income recognized with no allowance 0 0 0 0  
Recorded investment with allowance 0   0   0
Unpaid principal balance with allowance 0   0   0
Related allowance 0   0   0
Average recorded investment with allowance 0 0 0 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 0   0   0
Unpaid principal balance 0   0   0
Average recorded investment 0 0 0 0  
Interest income recognized 0 0 0 0  
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]          
Recorded investment with no allowance 566   566   702
Unpaid principal balance with no allowance 585   585   716
Average recorded investment with no allowance 573 730 612 750  
Interest income recognized with no allowance 6 8 20 26  
Recorded investment with allowance 0   0   0
Unpaid principal balance with allowance 0   0   0
Related allowance 0   0   0
Average recorded investment with allowance 0 0 0 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 566   566   702
Unpaid principal balance 585   585   716
Average recorded investment 573 730 612 750  
Interest income recognized 6 8 20 26  
Commercial Portfolio Segment [Member]          
Recorded investment with no allowance 147   147   174
Unpaid principal balance with no allowance 147   147   174
Average recorded investment with no allowance 153 186 162 196  
Interest income recognized with no allowance 2 2 7 6  
Recorded investment with allowance 0   0   0
Unpaid principal balance with allowance 0   0   0
Related allowance 0   0   0
Average recorded investment with allowance 0 0 0 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 147   147   174
Unpaid principal balance 147   147   174
Average recorded investment 153 186 162 196  
Interest income recognized 2 2 7 6  
Related allowance with no allowance         0
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Recorded investment with no allowance 315   315   15
Unpaid principal balance with no allowance 331   331   15
Average recorded investment with no allowance 193 63 100 136  
Interest income recognized with no allowance 0 0 0 1  
Recorded investment with allowance 0   0   288
Unpaid principal balance with allowance 0   0   296
Related allowance 0   0   7
Average recorded investment with allowance 142 289 215 217  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 315   315   303
Unpaid principal balance 331   331   311
Average recorded investment 335 352 315 353  
Interest income recognized 0 0 0 1  
Related allowance with no allowance         0
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]          
Recorded investment with no allowance 0   0   0
Unpaid principal balance with no allowance 0   0   0
Average recorded investment with no allowance 0 0 0 0  
Interest income recognized with no allowance 0 0 0 0  
Recorded investment with allowance 0   0   0
Unpaid principal balance with allowance 0   0   0
Related allowance 0   0   0
Average recorded investment with allowance 0 0 0 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 0   0   0
Unpaid principal balance 0   0   0
Average recorded investment 0 0 0 0  
Interest income recognized $ 0 $ 0 $ 0 $ 0  
Related allowance with no allowance         $ 0