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Note 7 - Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance $ 9,853   $ 10,909
Unpaid principal balance - with no specific allowance 11,178   11,759
Recorded investment - with an allowance 4,076   4,097
Unpaid principal balance - with an allowance 4,404   4,440
Related allowance 1,073   1,198
Unpaid principal balance 15,582   16,199
Recorded investment 13,929   15,006
Average recorded investment 14,569 $ 14,430  
Interest income recognized 58 64  
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 2,313   2,482
Unpaid principal balance - with no specific allowance 2,659   2,862
Recorded investment - with an allowance 2,564   2,652
Unpaid principal balance - with an allowance 2,742   2,812
Related allowance 841   696
Unpaid principal balance 5,401   5,674
Recorded investment 4,877   5,134
Average recorded investment 4,995 4,570  
Interest income recognized 5 19  
Commercial Portfolio Segment [Member] | Construction Loans [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 7   224
Unpaid principal balance - with no specific allowance 7   234
Recorded investment - with an allowance 0   0
Unpaid principal balance - with an allowance 0   0
Related allowance 0   0
Unpaid principal balance 7   234
Recorded investment 7   224
Average recorded investment 146 382  
Interest income recognized 2 4  
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 5,422   6,383
Unpaid principal balance - with no specific allowance 5,929   6,367
Recorded investment - with an allowance 110   0
Unpaid principal balance - with an allowance 112   0
Related allowance 52   0
Unpaid principal balance 6,041   6,367
Recorded investment 5,532   6,383
Average recorded investment 6,128 6,554  
Interest income recognized 40 34  
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 1,020   1,046
Unpaid principal balance - with no specific allowance 1,430   1,438
Recorded investment - with an allowance 1,229   1,267
Unpaid principal balance - with an allowance 1,360   1,435
Related allowance 176   494
Unpaid principal balance 2,790   2,873
Recorded investment 2,249   2,313
Average recorded investment 2,278 2,070  
Interest income recognized 7 4  
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 91   93
Unpaid principal balance - with no specific allowance 93   95
Recorded investment - with an allowance 0   0
Unpaid principal balance - with an allowance 0   0
Related allowance 0   0
Unpaid principal balance 93   95
Recorded investment 91   93
Average recorded investment 92 0  
Interest income recognized 0 0  
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 908   570
Unpaid principal balance - with no specific allowance 928   589
Recorded investment - with an allowance 173   178
Unpaid principal balance - with an allowance 190   193
Related allowance 4   8
Unpaid principal balance 1,118   782
Recorded investment 1,081   748
Average recorded investment 829 580  
Interest income recognized 4 3  
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 92   111
Unpaid principal balance - with no specific allowance 132   174
Recorded investment - with an allowance 0   0
Unpaid principal balance - with an allowance 0   0
Related allowance 0   0
Unpaid principal balance 132   174
Recorded investment 92   $ 111
Average recorded investment 101 145  
Interest income recognized 0 0  
Finance Leases Portfolio Segment [Member]      
Financing Receivable Impaired [Line Items]      
Average recorded investment 0 129  
Interest income recognized $ 0 $ 0