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Note 4 - Loans and Related Allowance for Loan and Lease Losses - Major Classifications of Net Loans (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable Gross $ 923,213 $ 609,140  
Less: Allowance for loan and lease losses (7,190) (6,598) $ (6,385)
Net loans 916,023 602,542  
Commercial And Industrial [Member]      
Financing Receivable Gross 101,346 60,630  
Less: Allowance for loan and lease losses (999) (448) (867)
Real Estate Construction Porfolio Segment [Member]      
Financing Receivable Gross 47,017 23,709  
Less: Allowance for loan and lease losses (313) (172) (276)
Real Estate Mortgage Portfolio Segment [Member] | Residential Loan [Member]      
Financing Receivable Gross 318,157 270,830  
Less: Allowance for loan and lease losses (1,760) (2,818) (3,139)
Real Estate Mortgage Portfolio Segment [Member] | Commercial Loans [Member]      
Financing Receivable Gross 437,947 249,490  
Less: Allowance for loan and lease losses (4,036) (3,135) (2,078)
Consumer Portfolio Segment [Member]      
Financing Receivable Gross 18,746 4,481  
Less: Allowance for loan and lease losses $ (82) $ (25) $ (25)