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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Recorded investment with no allowance $ 2,909   $ 2,909   $ 3,168
Unpaid principal balance with no allowance 3,128   3,128   3,563
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 2,967 $ 3,397 3,115 $ 3,434  
Interest income recognized with no allowance 14 12 46 34  
Recorded investment with allowance 333   333   255
Unpaid principal balance with allowance 356   356   261
Related allowance 213   213   52
Average recorded investment with allowance 309 169 298 203  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 3,242   3,242   3,423
Unpaid principal balance 3,484   3,484   3,824
Average recorded investment 3,276 3,566 3,413 3,637  
Interest income recognized 14 12 46 34  
Related allowance 213   213   52
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]          
Recorded investment with no allowance 2,159   2,159   2,695
Unpaid principal balance with no allowance 2,365   2,365   2,948
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 2,144 2,736 2,377 2,373  
Interest income recognized with no allowance 7 7 19 20  
Recorded investment with allowance 254   254   212
Unpaid principal balance with allowance 274   274   218
Related allowance 160   160   35
Average recorded investment with allowance 255 95 250 122  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 2,413   2,413   2,907
Unpaid principal balance 2,639   2,639   3,166
Average recorded investment 2,399 2,831 2,627 2,495  
Interest income recognized 7 7 19 20  
Related allowance 160   160   35
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]          
Recorded investment with no allowance 96   96  
Unpaid principal balance with no allowance 97   97  
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 215 0 131 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 96   96  
Unpaid principal balance 97   97  
Average recorded investment 215 0 131 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 347   347   401
Unpaid principal balance with no allowance 349   349   535
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 303 366 343 758  
Interest income recognized with no allowance 4 5 14 13  
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 347   347   401
Unpaid principal balance 349   349   535
Average recorded investment 303 366 343 758  
Interest income recognized 4 5 14 13  
Related allowance 0   0  
Commercial Portfolio Segment [Member]          
Recorded investment with no allowance 264   264   12
Unpaid principal balance with no allowance 266   266   12
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 241 63 196 69  
Interest income recognized with no allowance 3 0 11 0  
Recorded investment with allowance 79   79   30
Unpaid principal balance with allowance 82   82   30
Related allowance 53   53   4
Average recorded investment with allowance 54 25 41 42  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 343   343   42
Unpaid principal balance 348   348   42
Average recorded investment 295 88 237 111  
Interest income recognized 3 0 11 0  
Related allowance 53   53   4
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]          
Recorded investment with no allowance 35   35   60
Unpaid principal balance with no allowance 43   43   68
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 56 226 62 228  
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 0 32 7 22  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 35   35   73
Unpaid principal balance 43   43   81
Average recorded investment 56 258 69 250  
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 8   8  
Related allowance with no allowance 0   0    
Average recorded investment with no allowance 8 6 6 6  
Interest income recognized with no allowance 0 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 17 0 17  
Interest income recognized with allowance 0 0 0 0  
Recorded investment 8   8  
Unpaid principal balance 8   8  
Average recorded investment 8 23 6 23  
Interest income recognized 0 $ 0 1 $ 0  
Related allowance $ 0   $ 0