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Summary of Significant Accounting Policies (Detail Textuals) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Summary Of Significant Accounting Policies [Line Items]    
Mortgage loans held for sale $ 162,000 $ 1,200,000
Depreciation methods Straight line and accelerated methods  
Sustained period of repayment performance for non-accrual TDRs 6 months  
Period of employees highest compensation before retirement 10 years  
Buildings and improvements    
Summary Of Significant Accounting Policies [Line Items]    
Estimated useful lives 5 to 40 years  
Furniture and equipment    
Summary Of Significant Accounting Policies [Line Items]    
Estimated useful lives 3 to 15 years  
Federal Home Loan Bank of Des Moines    
Summary Of Significant Accounting Policies [Line Items]    
Investment in capital stock of the Federal Home Loan Bank of total assets 0.12%  
Investment in capital stock of Federal Home Loan Bank required percentage of advances 4.00%