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Loans and allowance for loan losses (Details Textual) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2014
Loans and Leases Receivable, Allowance $ 3,419,000 $ 5,496,000 $ 3,419,000 $ 5,496,000 $ 3,562,000 $ 3,523,000 $ 5,567,000 $ 5,729,000
Allowance for Loan and Lease Loss, Recovery of Bad Debts 120,000 70,000 323,000 551,000 649,000      
Provision for Loan and Lease Losses 0 0 $ 0 0 (2,000,000)      
Percentages Of Principal And Accrued Interest Covered By Guarantee     98.00%          
Loans Pledged as Collateral 11,076,000   $ 11,076,000   7,891,000      
Financing Receivable, Modifications, Recorded Investment $ 13,221,000 $ 89,000 13,221,000 $ 89,000 15,485,000      
Commercial Real Estate Portfoliio [Member]                
Allowance for Loan and Lease Loss, Recovery of Bad Debts     571,000          
Increase (Decrease) in Finance Receivables     $ 112,000          
Percentage Of Recovery Loss On Portfolio From Historical Experience 0.20% 0.68% 0.20% 0.68%        
Consumer Real Estate Portfoliio [Member]                
Allowance for Loan and Lease Loss, Recovery of Bad Debts     $ 131,000 $ 314,000 $ 149,000      
Increase (Decrease) in Finance Receivables       $ 189,000        
Percentage Of Recovery Loss On Portfolio From Historical Experience 0.07% 0.72% 0.07% 0.72% 0.72%     1.63%
Construction and Land Development [Member]                
Loans and Leases Receivable, Allowance $ 319,000 $ 498,000 $ 319,000 $ 498,000 $ 321,000 $ 290,000 $ 461,000 $ 236,000
Allowance for Loan and Lease Loss, Recovery of Bad Debts 5,000 $ 0 6,000 $ 23,000 51,000      
Percentage Of Recovery Loss On Portfolio From Historical Experience   0.28%   0.28%       0.37%
Provision for Loan and Lease Losses $ 34,000 $ 104,000 $ 2,000 $ 491,000 $ 286,000