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Note 8 - Impaired Loans (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance $ 10,335   $ 11,125
Unpaid principal balance - with no specific allowance 11,501   12,531
Recorded investment - with an allowance 1,654   2,459
Unpaid principal balance - with an allowance 2,946   3,676
Related allowance 1,208   1,392
Unpaid principal balance 14,447   16,207
Recorded investment 11,989   13,584
Average recorded investment 13,147 $ 14,203  
Interest income recognized 186 109  
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 3,789   5,070
Unpaid principal balance - with no specific allowance 3,998   5,461
Recorded investment - with an allowance 1,290   1,428
Unpaid principal balance - with an allowance 2,535   2,593
Related allowance 1,125   1,260
Unpaid principal balance 6,533   8,054
Recorded investment 5,079   6,498
Average recorded investment 6,208 4,879  
Interest income recognized 121 8  
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 86  
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 3,781   3,874
Unpaid principal balance - with no specific allowance 4,336   4,464
Recorded investment - with an allowance 0   0
Unpaid principal balance - with an allowance 0   0
Related allowance 0   0
Unpaid principal balance 4,336   4,464
Recorded investment 3,781   3,874
Average recorded investment 3,752 5,838  
Interest income recognized 49 78  
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 1,408   914
Unpaid principal balance - with no specific allowance 1,712   1,239
Recorded investment - with an allowance 165   830
Unpaid principal balance - with an allowance 185   879
Related allowance 61   84
Unpaid principal balance 1,897   2,118
Recorded investment 1,573   1,744
Average recorded investment 1,696 2,252  
Interest income recognized 9 13  
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 81   85
Unpaid principal balance - with no specific allowance 87   90
Recorded investment - with an allowance 0   0
Unpaid principal balance - with an allowance 0   0
Related allowance 0   0
Unpaid principal balance 87   90
Recorded investment 81   85
Average recorded investment 83 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 1,150   1,057
Unpaid principal balance - with no specific allowance 1,191   1,108
Recorded investment - with an allowance 159   161
Unpaid principal balance - with an allowance 185   163
Related allowance 9   8
Unpaid principal balance 1,376   1,271
Recorded investment 1,309   1,218
Average recorded investment 1,222 955  
Interest income recognized 6 7  
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 126   124
Unpaid principal balance - with no specific allowance 177   168
Recorded investment - with an allowance 40   40
Unpaid principal balance - with an allowance 41   41
Related allowance 13   40
Unpaid principal balance 218   209
Recorded investment 166   $ 164
Average recorded investment 186 102  
Interest income recognized $ 1 $ 1