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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Recorded investment with no allowance $ 2,363   $ 2,363   $ 3,168
Unpaid principal balance with no allowance 2,485   2,485   3,338
Average recorded investment with no allowance 2,582 $ 3,547 2,834 $ 3,055  
Interest income recognized with no allowance 16 21 51 59  
Recorded investment with allowance 288   288    
Unpaid principal balance with allowance 295   295    
Related allowance 7   7   0
Average recorded investment with allowance 315 300 230 241  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 2,651   2,651   3,168
Unpaid principal balance 2,780   2,780   3,338
Average recorded investment 2,897 3,847 3,064 3,296  
Interest income recognized 16 21 51 59  
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]          
Recorded investment with no allowance 1,347   1,347   1,728
Unpaid principal balance with no allowance 1,454   1,454   1,902
Average recorded investment with no allowance 1,503 1,532 1,653 1,616  
Interest income recognized with no allowance 6 6 18 16  
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 0 109 0 146  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 1,347   1,347   1,728
Unpaid principal balance 1,454   1,454   1,902
Average recorded investment 1,503 1,641 1,653 1,762  
Interest income recognized 6 6 18 16  
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]          
Recorded investment with no allowance 100   100   97
Unpaid principal balance with no allowance 102   102   97
Average recorded investment with no allowance 100 90 99 102  
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 26 0 13 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 100   100   97
Unpaid principal balance 102   102   97
Average recorded investment 126 90 112 102  
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 719   719   779
Unpaid principal balance with no allowance 733   733   784
Average recorded investment with no allowance 730 1,301 750 851  
Interest income recognized with no allowance 8 9 26 27  
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 719   719   779
Unpaid principal balance 733   733   784
Average recorded investment 730 1,301 750 851  
Interest income recognized 8 9 26 27  
Commercial Portfolio Segment [Member]          
Recorded investment with no allowance 181   181   211
Unpaid principal balance with no allowance 181   181   210
Average recorded investment with no allowance 186 268 196 258  
Interest income recognized with no allowance 2 2 6 7  
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 0 191 0 95  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 181   181   211
Unpaid principal balance 181   181   210
Average recorded investment 186 459 196 353  
Interest income recognized 2 2 6 7  
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Recorded investment with no allowance 16   16   353
Unpaid principal balance with no allowance 15   15   345
Average recorded investment with no allowance 63 352 136 204  
Interest income recognized with no allowance 0 4 1 9  
Recorded investment with allowance 288   288   0
Unpaid principal balance with allowance 295   295   0
Related allowance 7   7   0
Average recorded investment with allowance 289 0 217 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 304   304   353
Unpaid principal balance 310   310   345
Average recorded investment 352 352 353 204  
Interest income recognized 0 4 1 9  
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 4 0 24  
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 4 0 24  
Interest income recognized $ 0 $ 0 $ 0 $ 0