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Note 5 - Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance $ 10,909 $ 12,414  
Unpaid principal balance - with no specific allowance 11,759 13,966  
Recorded investment - with an allowance 4,097 2,527  
Unpaid principal balance - with an allowance 4,440 2,773  
Related allowance 1,198 974  
Unpaid principal balance 16,199 16,739  
Recorded investment 15,006 14,941  
Average recorded investment 13,488 16,046 $ 25,768
Interest income recognized 233 346 683
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 2,482 3,629  
Unpaid principal balance - with no specific allowance 2,862 3,923  
Recorded investment - with an allowance 2,652 957  
Unpaid principal balance - with an allowance 2,812 1,086  
Related allowance 696 712  
Unpaid principal balance 5,674 5,009  
Recorded investment 5,134 4,586  
Average recorded investment 4,200 6,108 9,305
Interest income recognized 58 169 331
Commercial Portfolio Segment [Member] | Construction Loans [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 224 364  
Unpaid principal balance - with no specific allowance 234 364  
Recorded investment - with an allowance 0 0  
Unpaid principal balance - with an allowance 0 0  
Related allowance 0 0  
Unpaid principal balance 234 364  
Recorded investment 224 364  
Average recorded investment 370 396 1,050
Interest income recognized 18 20 2
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 6,383 6,932  
Unpaid principal balance - with no specific allowance 6,367 7,416  
Recorded investment - with an allowance 0 66  
Unpaid principal balance - with an allowance 0 66  
Related allowance 0 14  
Unpaid principal balance 6,367 7,482  
Recorded investment 6,383 6,998  
Average recorded investment 6,129 7,370 12,304
Interest income recognized 131 149 344
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 1,046 942  
Unpaid principal balance - with no specific allowance 1,438 1,653  
Recorded investment - with an allowance 1,267 1,171  
Unpaid principal balance - with an allowance 1,435 1,279  
Related allowance 494 203  
Unpaid principal balance 2,873 2,932  
Recorded investment 2,313 2,113  
Average recorded investment 1,960 1,544 2,452
Interest income recognized 15 0 0
Finance Leases Portfolio Segment [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance   3  
Unpaid principal balance - with no specific allowance   3  
Recorded investment - with an allowance 0 143  
Unpaid principal balance - with an allowance 0 145  
Related allowance 0 20  
Unpaid principal balance 0 148  
Recorded investment 0 146  
Average recorded investment 88 43 26
Interest income recognized 0 1 1
Retail Portfolio Segment [Member] | Consumer Loans [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 93    
Unpaid principal balance - with no specific allowance 95    
Recorded investment - with an allowance 0 0  
Unpaid principal balance - with an allowance 0 0  
Related allowance 0 0  
Unpaid principal balance 95 0  
Recorded investment 93 0  
Average recorded investment 29 2 2
Interest income recognized 0 0 0
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 570 393  
Unpaid principal balance - with no specific allowance 589 406  
Recorded investment - with an allowance 178 190  
Unpaid principal balance - with an allowance 193 197  
Related allowance 8 25  
Unpaid principal balance 782 603  
Recorded investment 748 583  
Average recorded investment 583 448 460
Interest income recognized 10 6 5
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 111 151  
Unpaid principal balance - with no specific allowance 174 201  
Recorded investment - with an allowance 0 0  
Unpaid principal balance - with an allowance 0 0  
Related allowance 0 0  
Unpaid principal balance 174 201  
Recorded investment 111 151  
Average recorded investment 129 135 169
Interest income recognized $ 1 $ 1 $ 0