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Fair Value (Details Textual) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 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 2,238,000   $ 2,710,000
Impaired loans, allowance 101,000   249,000
Provision for loan losses 1,050,000 780,000 0
Troubled debt restructurings $ 6,200,000   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
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 188,000   727,000
Impaired loans, allowance 23,000   $ 173,000
Provision for loan losses $ 4,000 $ 0