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Loans and Allowance for Loan Losses (Detail Textuals)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2016
USD ($)
Contract
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2016
USD ($)
Contract
Dec. 31, 2016
USD ($)
Loans and Leases Receivable Disclosure [Line Items]          
Amount of loans pledged as collateral to the Federal Home Loan Bank $ 490,800,000   $ 490,800,000    
Impaired loans individually evaluated for impairment 10,886,000   10,886,000   $ 9,144,000
Impaired loans were evaluated based on the fair value of the loan's collateral 7,100,000   7,100,000   4,500,000
Specific allowance related to impaired loans 1,738,000 $ 1,300,000 1,738,000 $ 1,300,000 1,080,000
Impaired loans with no reserve allocation $ 2,832,000   $ 2,832,000   $ 2,114,000
Impaired loans required no reserve allocation, percentage 26.00%   26.00%   23.00%
Interest income recognized on impaired loans $ 61,000 $ 55,000 $ 200,000 $ 246,000  
Troubled debt restructurings 5,700,000   5,700,000   $ 6,300,000
Amount of specific reserves related to TDRs which were allocated to the allowance for loan losses $ 531,000   $ 531,000   410,000
Number of contracts modified | Contract [1] 1 6 3 7  
Minimum          
Loans and Leases Receivable Disclosure [Line Items]          
Look back period     3 years    
Maximum          
Loans and Leases Receivable Disclosure [Line Items]          
Look back period     5 years    
Performing TDRs          
Loans and Leases Receivable Disclosure [Line Items]          
Troubled debt restructurings $ 4,700,000   $ 4,700,000   5,700,000
Nonperforming TDRs          
Loans and Leases Receivable Disclosure [Line Items]          
Troubled debt restructurings $ 1,000,000   $ 1,000,000   $ 619,000
[1] The amounts reported post-modification are inclusive of all partial pay-downs and charge-offs, and no portion of the debt was forgiven. Loans modified as a TDR that were fully paid down, charged-off or foreclosed upon during the period ended are not reported.