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Note 4 - Loans and Related Allowance for Loan Loss (Details Textual)
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Sep. 30, 2016
Sep. 30, 2017
USD ($)
Sep. 30, 2016
Dec. 31, 2016
USD ($)
Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums $ 682,000   $ 682,000   $ 818,000
Real Estate Loans Serviced for Others 94,600,000   94,600,000   83,900,000
Mortgage Loans in Process of Foreclosure, Amount $ 1,200,000   $ 1,200,000   $ 2,200,000
Financing Receivable, TDRs, Number of Contracts 16   16   15
Financing Receivable, Modifications, Recorded Investment $ 4,700,000   $ 4,700,000   $ 4,700,000
Financing Receivable, Modifications, Number of Contracts   0      
Financing Receivable, Modifications, Subsequent Default, Number of Contracts 0 0 0 0  
Loans and Leases Receivable, Gross $ 703,874,000   $ 703,874,000   681,897,000
Unlikely to be Collected Financing Receivable [Member]          
Loans and Leases Receivable, Gross 0   0   0
Real Estate Sector [Member] | Residential Portfolio Segment [Member]          
Loans and Leases Receivable, Gross 268,431,000   268,431,000   271,588,000
Real Estate Sector [Member] | Commercial Portfolio Segment [Member]          
Loans and Leases Receivable, Gross $ 203,268,000   $ 203,268,000   $ 201,010,000
Originated Loans [Member]          
Financing Receivable, TDRs, Number of Contracts 8   8   6
Financing Receivable, Modifications, Recorded Investment $ 2,800,000   $ 2,800,000   $ 2,300,000
Financing Receivable, Modifications, Number of Contracts 1   1 1  
Loans and Leases Receivable, Gross $ 567,104,000   $ 567,104,000   525,352,000
Originated Loans [Member] | Real Estate Sector [Member] | Residential Portfolio Segment [Member]          
Financing Receivable, Modifications, Number of Contracts 1   1    
Loans and Leases Receivable, Gross $ 193,214,000   $ 193,214,000   186,077,000
Originated Loans [Member] | Real Estate Sector [Member] | Commercial Portfolio Segment [Member]          
Loans and Leases Receivable, Gross $ 150,442,000   $ 150,442,000   $ 139,894,000
Acquired Loans [Member]          
Financing Receivable, TDRs, Number of Contracts 8   8   9
Financing Receivable, Modifications, Recorded Investment $ 1,900,000   $ 1,900,000   $ 2,400,000
Financing Receivable, Modifications, Number of Contracts       2  
Loans and Leases Receivable, Gross $ 136,770,000   $ 136,770,000   156,545,000
Acquired Loans [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable Modifications Number of Contracts Paid Off       1  
Acquired Loans [Member] | Real Estate Sector [Member] | Residential Portfolio Segment [Member]          
Financing Receivable Modifications Number of Contracts Paid Off 1   1 1  
Financing Receivable, Modifications, Number of Contracts       1  
Loans and Leases Receivable, Gross $ 75,217,000   $ 75,217,000   85,511,000
Acquired Loans [Member] | Real Estate Sector [Member] | Commercial Portfolio Segment [Member]          
Financing Receivable Modifications Number of Contracts Paid Off       1  
Financing Receivable, Modifications, Number of Contracts       1  
Loans and Leases Receivable, Gross $ 52,826,000   $ 52,826,000   $ 61,116,000