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Loans Receivable (Narrative) (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2018
USD ($)
loan
Dec. 31, 2017
USD ($)
loan
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable $ 418,494 $ 439,855
Loans receivable with fixed rates of interest 39,600,000 40,600,000
Loans receivable with variable rates of interest $ 26,000,000 $ 28,400,000
Historical loss experience factor measurement period 3 years  
Number of impaired loans | loan 0 0
Interest income recorded on impaired loans $ 0 $ 0
Non-owner occupied one-to-four family residential    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Maximum term on loans 30 years  
Loan amount, percentage of appraised value threshold 75.00%  
Commercial real estate    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Maximum term on loans 30 years  
Loan amount, percentage of appraised value threshold 75.00%  
Loans receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable $ 205,362 $ 218,967