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Note 8 - Impaired Loans (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance $ 7,566   $ 11,763
Unpaid principal balance - with no specific allowance 8,849   12,873
Recorded investment - with an allowance 6,876   4,719
Unpaid principal balance - with an allowance 8,357   6,042
Related allowance 2,356   1,664
Unpaid principal balance 17,206   18,915
Recorded investment 14,442   16,482
Average recorded investment 11,643 $ 13,775  
Interest income recognized 122 266  
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 929   4,243
Unpaid principal balance - with no specific allowance 1,282   4,525
Recorded investment - with an allowance 5,569   2,885
Unpaid principal balance - with an allowance 6,949   4,128
Related allowance 2,282   1,461
Unpaid principal balance 8,231   8,653
Recorded investment 6,498   7,128
Average recorded investment 4,127 5,913  
Interest income recognized 1 164  
Commercial Portfolio Segment [Member] | Construction Loans [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 0    
Unpaid principal balance - with no specific allowance 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  
Commercial Portfolio Segment [Member] | Secured by Commercial Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 3,599   5,012
Unpaid principal balance - with no specific allowance 4,268   5,577
Recorded investment - with an allowance 960   1,071
Unpaid principal balance - with an allowance 1,006   1,095
Related allowance 8   101
Unpaid principal balance 5,274   6,672
Recorded investment 4,559   6,083
Average recorded investment 4,468 4,543  
Interest income recognized 81 77  
Commercial Portfolio Segment [Member] | Secured by Residential Real Estate [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 1,431   1,023
Unpaid principal balance - with no specific allowance 1,596   1,140
Recorded investment - with an allowance 195   717
Unpaid principal balance - with an allowance 241   773
Related allowance 49   97
Unpaid principal balance 1,837   1,913
Recorded investment 1,626   1,740
Average recorded investment 1,716 1,808  
Interest income recognized 30 15  
Retail Portfolio Segment [Member] | Consumer Loans [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 71   77
Unpaid principal balance - with no specific allowance 80   84
Recorded investment - with an allowance 0   0
Unpaid principal balance - with an allowance 0   0
Related allowance 0   0
Unpaid principal balance 80   84
Recorded investment 71   77
Average recorded investment 74 82  
Interest income recognized 0 0  
Retail Portfolio Segment [Member] | Family Residential Mortgages [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 968   1,268
Unpaid principal balance - with no specific allowance 1,005   1,357
Recorded investment - with an allowance 152   0
Unpaid principal balance - with an allowance 161   0
Related allowance 17   0
Unpaid principal balance 1,166   1,357
Recorded investment 1,120   1,268
Average recorded investment 1,060 1,244  
Interest income recognized 9 9  
Retail Portfolio Segment [Member] | Home Equity Loans and Lines [Member]      
Financing Receivable Impaired [Line Items]      
Recorded investment - with no specific allowance 568   140
Unpaid principal balance - with no specific allowance 618   190
Recorded investment - with an allowance 0   46
Unpaid principal balance - with an allowance 0   46
Related allowance 0   5
Unpaid principal balance 618   236
Recorded investment 568   $ 186
Average recorded investment 198 185  
Interest income recognized $ 1 $ 1