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Note 8 - Impaired Loans (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance $ 14,246   $ 11,125
Unpaid principal balance - with no specific allowance 15,118   12,531
Recorded investment - with an allowance 2,904   2,459
Unpaid principal balance - with an allowance 4,186   3,676
Related allowance 1,568   1,392
Unpaid principal balance 19,304   16,207
Recorded investment 17,150   13,584
Average recorded investment 13,775 $ 13,905  
Interest income recognized 266 160  
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 4,124   5,070
Unpaid principal balance - with no specific allowance 4,248   5,461
Recorded investment - with an allowance 1,898   1,428
Unpaid principal balance - with an allowance 3,092   2,593
Related allowance 1,456   1,260
Unpaid principal balance 7,340   8,054
Recorded investment 6,022   6,498
Average recorded investment 5,913 4,809  
Interest income recognized 164 11  
Commercial Portfolio Segment [Member] | Construction Loans [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 0   1
Unpaid principal balance - with no specific allowance 0   1
Recorded investment - with an allowance 0   0
Unpaid principal balance - with an allowance 0   0
Related allowance 0   0
Unpaid principal balance 0   1
Recorded investment 0   1
Average recorded investment 0 61  
Interest income recognized 0 2  
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 7,562   3,874
Unpaid principal balance - with no specific allowance 8,127   4,464
Recorded investment - with an allowance 0   0
Unpaid principal balance - with an allowance 0   0
Related allowance 0   0
Unpaid principal balance 8,127   4,464
Recorded investment 7,562   3,874
Average recorded investment 4,543 5,638  
Interest income recognized 77 117  
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 1,157   914
Unpaid principal balance - with no specific allowance 1,270   1,239
Recorded investment - with an allowance 850   830
Unpaid principal balance - with an allowance 910   879
Related allowance 106   84
Unpaid principal balance 2,180   2,118
Recorded investment 2,007   1,744
Average recorded investment 1,808 2,171  
Interest income recognized 15 19  
State and Political Subdivisions Portfolio Segment [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 0   0
Unpaid principal balance - with no specific allowance 0   0
Recorded investment - with an allowance 0   0
Unpaid principal balance - with an allowance 0   0
Related allowance 0   0
Unpaid principal balance 0   0
Recorded investment 0   0
Average recorded investment 0 0  
Interest income recognized 0 0  
Retail Portfolio Segment [Member] | Consumer Loans [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 79   85
Unpaid principal balance - with no specific allowance 86   90
Recorded investment - with an allowance 0   0
Unpaid principal balance - with an allowance 0   0
Related allowance 0   0
Unpaid principal balance 86   90
Recorded investment 79   85
Average recorded investment 82 91  
Interest income recognized 0 0  
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 1,132   1,057
Unpaid principal balance - with no specific allowance 1,140   1,108
Recorded investment - with an allowance 156   161
Unpaid principal balance - with an allowance 184   163
Related allowance 6   8
Unpaid principal balance 1,324   1,271
Recorded investment 1,288   1,218
Average recorded investment 1,244 1,020  
Interest income recognized 9 10  
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 192   124
Unpaid principal balance - with no specific allowance 247   168
Recorded investment - with an allowance 0   40
Unpaid principal balance - with an allowance 0   41
Related allowance 0   40
Unpaid principal balance 247   209
Recorded investment 192   $ 164
Average recorded investment 185 115  
Interest income recognized $ 1 $ 1