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Loans and Allowance for Loan Losses (Detail Textuals)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
Contract
Loan
Mar. 31, 2017
USD ($)
Contract
Dec. 31, 2017
USD ($)
Loans and Leases Receivable Disclosure [Line Items]      
Amount of loans pledged as collateral to the Federal Home Loan Bank $ 479,400,000    
Look back period     5 years
Impaired loans individually evaluated for impairment 10,093,000   $ 10,356,000
Impaired loans were evaluated based on the fair value of the loan's collateral 3,800,000   4,000,000
Specific allowance related to impaired loans 1,336,000   1,333,000
Impaired loans with no reserve allocation $ 1,999,000   $ 2,433,000
Impaired loans required no reserve allocation, percentage 20.00%   23.00%
Interest income recognized on impaired loans $ 58,000 $ 76,000  
Troubled debt restructurings 6,300,000   $ 6,400,000
Amount of specific reserves related to TDRs which were allocated to the allowance for loan losses $ 662,000   577,000
Number of contracts modified | Contract [1] 0 2  
Number of mortgage loans in process of foreclosure | Loan 1    
Value of mortgage loans in process of foreclosure $ 48,000    
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 $ 4,600,000   4,700,000
Nonperforming TDRs      
Loans and Leases Receivable Disclosure [Line Items]      
Troubled debt restructurings $ 1,700,000   $ 1,700,000
[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.