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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, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Recorded investment with no allowance $ 3,468   $ 3,468   $ 2,558
Unpaid principal balance with no allowance 3,624   3,624   2,818
Average recorded investment with no allowance 3,547 $ 3,052 3,055 $ 3,305  
Interest income recognized with no allowance 21 23 59 46  
Recorded investment with allowance 292   292   189
Unpaid principal balance with allowance 321   321   211
Related allowance 138   138   16
Average recorded investment with allowance 300 192 241 250  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 3,760   3,760   2,747
Unpaid principal balance 3,945   3,945   3,029
Average recorded investment 3,847 3,244 3,296 3,555  
Interest income recognized 21 23 59 46  
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]          
Recorded investment with no allowance 1,482   1,482   1,737
Unpaid principal balance with no allowance 1,617   1,617   1,986
Average recorded investment with no allowance 1,532 1,882 1,616 2,032  
Interest income recognized with no allowance 6 6 16 12  
Recorded investment with allowance 109   109   189
Unpaid principal balance with allowance 129   129   211
Related allowance 0   0   16
Average recorded investment with allowance 109 47 146 61  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 1,591   1,591   1,926
Unpaid principal balance 1,746   1,746   2,197
Average recorded investment 1,641 1,929 1,762 2,093  
Interest income recognized 6 6 16 12  
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]          
Recorded investment with no allowance 97   97   115
Unpaid principal balance with no allowance 97   97   117
Average recorded investment with no allowance 90 141 102 156  
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 97   97   115
Unpaid principal balance 97   97   117
Average recorded investment 90 141 102 156  
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 0 262  
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 0 262  
Interest income recognized 0 0 0 0  
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]          
Recorded investment with no allowance 1,284   1,284   353
Unpaid principal balance with no allowance 1,308   1,308   352
Average recorded investment with no allowance 1,301 686 851 470  
Interest income recognized with no allowance 9 14 27 25  
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 0 100 0 101  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 1,284   1,284   353
Unpaid principal balance 1,308   1,308   352
Average recorded investment 1,301 786 851 571  
Interest income recognized 9 14 27 25  
Commercial Portfolio Segment [Member]          
Recorded investment with no allowance 253   253   249
Unpaid principal balance with no allowance 256   256   257
Average recorded investment with no allowance 268 302 258 350  
Interest income recognized with no allowance 2 3 7 9  
Recorded investment with allowance 183   183   0
Unpaid principal balance with allowance 192   192   0
Related allowance 138   138   0
Average recorded investment with allowance 191 26 95 72  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 436   436   249
Unpaid principal balance 448   448   257
Average recorded investment 459 328 353 422  
Interest income recognized 2 3 7 9  
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Recorded investment with no allowance 352   352   56
Unpaid principal balance with no allowance 346   346   56
Average recorded investment with no allowance 352 14 204 22  
Interest income recognized with no allowance 4 0 9 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 19 0 16  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 352   352   56
Unpaid principal balance 346   346   56
Average recorded investment 352 33 204 38  
Interest income recognized 4 0 9 0  
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]          
Recorded investment with no allowance 0   0   48
Unpaid principal balance with no allowance 0   0   50
Average recorded investment with no allowance 4 27 24 13  
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   48
Unpaid principal balance 0   0   $ 50
Average recorded investment 4 27 24 13  
Interest income recognized $ 0 $ 0 $ 0 $ 0