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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Recorded investment with no allowance $ 3,021   $ 3,021   $ 3,168
Unpaid principal balance with no allowance 3,257   3,257   3,563
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 3,192 $ 3,457 3,182 $ 3,435  
Interest income recognized with no allowance 15 12 32 23  
Recorded investment with allowance 283   283   255
Unpaid principal balance with allowance 304   304   261
Related allowance 162   162   52
Average recorded investment with allowance 302 185 286 226  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 3,304   3,304   3,423
Unpaid principal balance 3,561   3,561   3,824
Average recorded investment 3,494 3,642 3,468 3,661  
Interest income recognized 15 12 32 23  
Related allowance 162   162   52
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]          
Recorded investment with no allowance 2,128   2,128   2,695
Unpaid principal balance with no allowance 2,357   2,357   2,948
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 2,327 2,387 2,449 2,215  
Interest income recognized with no allowance 5 6 13 14  
Recorded investment with allowance 255   255   212
Unpaid principal balance with allowance 274   274   218
Related allowance 160   160   35
Average recorded investment with allowance 267 87 248 128  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 2,383   2,383   2,907
Unpaid principal balance 2,631   2,631   3,166
Average recorded investment 2,594 2,474 2,697 2,343  
Interest income recognized 5 6 13 14  
Related allowance 160   160   35
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]          
Recorded investment with no allowance 333   333  
Unpaid principal balance with no allowance 339   339  
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 214 0 142 0  
Interest income recognized with no allowance 0 0 0 0  
Recorded investment with allowance 0   0  
Unpaid principal balance with allowance 0   0  
Related allowance 0   0  
Average recorded investment with allowance 0 0 0 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 333   333  
Unpaid principal balance 339   339  
Average recorded investment 214 0 142 0  
Interest income recognized 0 0 0 0  
Related allowance 0   0  
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]          
Recorded investment with no allowance 0   0  
Unpaid principal balance with no allowance 0   0  
Related allowance with no allowance 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  
Unpaid principal balance with allowance 0   0  
Related allowance 0   0  
Average recorded investment with allowance 0 0 0 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 0   0  
Unpaid principal balance 0   0  
Average recorded investment 0 0 0 0  
Interest income recognized 0 0 0 0  
Related allowance 0   0  
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]          
Recorded investment with no allowance 259   259   401
Unpaid principal balance with no allowance 257   257   535
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 312 759 342 911  
Interest income recognized with no allowance 5 6 10 8  
Recorded investment with allowance 0   0  
Unpaid principal balance with allowance 0   0  
Related allowance 0   0  
Average recorded investment with allowance 0 0 0 0  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 259   259   401
Unpaid principal balance 257   257   535
Average recorded investment 312 759 342 911  
Interest income recognized 5 6 10 8  
Related allowance 0   0  
Commercial Portfolio Segment [Member]          
Recorded investment with no allowance 217   217   12
Unpaid principal balance with no allowance 219   219   12
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 254 72 173 73  
Interest income recognized with no allowance 4 0 7 0  
Recorded investment with allowance 28   28   30
Unpaid principal balance with allowance 30   30   30
Related allowance 2   2   4
Average recorded investment with allowance 28 50 29 56  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 245   245   42
Unpaid principal balance 249   249   42
Average recorded investment 282 122 202 129  
Interest income recognized 4 0 7 0  
Related allowance 2   2   4
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Recorded investment with no allowance 76   76   60
Unpaid principal balance with no allowance 85   85   68
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 77 228 71 229  
Interest income recognized with no allowance 0 0 1 1  
Recorded investment with allowance 0   0   13
Unpaid principal balance with allowance 0   0   13
Related allowance 0   0   13
Average recorded investment with allowance 7 23 9 19  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 76   76   73
Unpaid principal balance 85   85   81
Average recorded investment 84 251 80 248  
Interest income recognized 0 0 1 1  
Related allowance 0   0   13
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]          
Recorded investment with no allowance 8   8  
Unpaid principal balance with no allowance 0   0  
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 8 11 5 7  
Interest income recognized with no allowance 1 0 1 0  
Recorded investment with allowance 0   0  
Unpaid principal balance with allowance 0   0  
Related allowance 0   0  
Average recorded investment with allowance 0 25 0 23  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 8   8  
Unpaid principal balance 0   0  
Average recorded investment 8 36 5 30  
Interest income recognized 1 $ 0 1 $ 0  
Related allowance $ 0   $ 0