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Note 3 - Loans and Allowance for Loan Losses - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Recorded investment with no allowance $ 3,578   $ 3,533
Unpaid principal balance with no allowance 3,933   3,838
Related allowance with no allowance    
Average recorded investment with no allowance 3,556 $ 3,265  
Interest income recognized with no allowance 8 16  
Recorded investment with allowance 369   252
Unpaid principal balance with allowance 387   258
Related allowance 68   48
Average recorded investment with allowance 312 287  
Interest income recognized with allowance  
Recorded investment 3,947   3,785
Unpaid principal balance 4,320   4,096
Average recorded investment 3,868 3,552  
Interest income recognized 8 16  
Related allowance 68   48
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Recorded investment with no allowance 2,192   2,170
Unpaid principal balance with no allowance 2,478   2,409
Related allowance with no allowance    
Average recorded investment with no allowance 2,181 2,610  
Interest income recognized with no allowance 3 7  
Recorded investment with allowance 137   14
Unpaid principal balance with allowance 145   15
Related allowance 28   3
Average recorded investment with allowance 76 245  
Interest income recognized with allowance  
Recorded investment 2,329   2,184
Unpaid principal balance 2,623   2,424
Average recorded investment 2,257 2,855  
Interest income recognized 3 7  
Related allowance 28   3
Real Estate Mortgage Portfolio Segment [Member] | Land Loan [Member]      
Recorded investment with no allowance 189   152
Unpaid principal balance with no allowance 191   153
Related allowance with no allowance    
Average recorded investment with no allowance 171 47  
Interest income recognized with no allowance  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance  
Interest income recognized with allowance  
Recorded investment 189   152
Unpaid principal balance 191   153
Average recorded investment 171 47  
Interest income recognized  
Related allowance  
Real Estate Mortgage Portfolio Segment [Member] | Construction Loans [Member]      
Recorded investment with no allowance 525   521
Unpaid principal balance with no allowance 525   521
Related allowance with no allowance    
Average recorded investment with no allowance 523  
Interest income recognized with no allowance  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance  
Interest income recognized with allowance  
Recorded investment 525   521
Unpaid principal balance 525   521
Average recorded investment 523  
Interest income recognized  
Related allowance  
Real Estate Mortgage Portfolio Segment [Member] | Commercial Real Estate Loan [Member]      
Recorded investment with no allowance 251   255
Unpaid principal balance with no allowance 258   260
Related allowance with no allowance    
Average recorded investment with no allowance 253 383  
Interest income recognized with no allowance 2 5  
Recorded investment with allowance 206   211
Unpaid principal balance with allowance 212   213
Related allowance 39   44
Average recorded investment with allowance 103  
Interest income recognized with allowance  
Recorded investment 457   466
Unpaid principal balance 470   473
Average recorded investment 356 383  
Interest income recognized 2 5  
Related allowance 39   44
Commercial Portfolio Segment [Member]      
Recorded investment with no allowance 396   400
Unpaid principal balance with no allowance 447   451
Related allowance with no allowance    
Average recorded investment with no allowance 398 152  
Interest income recognized with no allowance 3 4  
Recorded investment with allowance 26   27
Unpaid principal balance with allowance 30   30
Related allowance 1   1
Average recorded investment with allowance 119 29  
Interest income recognized with allowance  
Recorded investment 422   427
Unpaid principal balance 477   481
Average recorded investment 517 181  
Interest income recognized 3 4  
Related allowance 1   1
Consumer Portfolio Segment [Member] | Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance 25   35
Unpaid principal balance with no allowance 34   44
Related allowance with no allowance    
Average recorded investment with no allowance 30 69  
Interest income recognized with no allowance  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance 14 13  
Interest income recognized with allowance  
Recorded investment 25   35
Unpaid principal balance 34   44
Average recorded investment 44 82  
Interest income recognized  
Related allowance  
Consumer Portfolio Segment [Member] | All Other Consumer Excluding Home Equity and Second Mortgage [Member]      
Recorded investment with no allowance  
Unpaid principal balance with no allowance  
Related allowance with no allowance    
Average recorded investment with no allowance 4  
Interest income recognized with no allowance  
Recorded investment with allowance  
Unpaid principal balance with allowance  
Related allowance  
Average recorded investment with allowance  
Interest income recognized with allowance  
Recorded investment  
Unpaid principal balance  
Average recorded investment 4  
Interest income recognized  
Related allowance