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Fair Value (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Fair value assets liabilities transfers amount between level 1 and level 2     $ 0 $ 0  
Impaired loans, unpaid principal balance with allowance recorded $ 2,242,000   2,242,000   $ 2,710,000
Impaired loans, allowance 92,000   92,000   249,000
Provision for loan losses 950,000 $ 990,000 2,000,000 1,770,000 0
Troubled debt restructurings 5,800,000   $ 5,800,000   7,000,000
Maximum maturity period of short term borrowings     90 days    
Measured Using Present Value of Cash Flows          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Troubled debt restructurings 2,000,000   $ 2,000,000   2,000,000
Collateral Dependent Impaired Loans          
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]          
Impaired loans, unpaid principal balance with allowance recorded 207,000   207,000   727,000
Impaired loans, allowance 21,000   $ 21,000   $ 173,000
Provision for loan losses $ 153,000     $ 0