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Summary of Significant Accounting Policies - Other (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Summary Of Significant Accounting Policies      
Mortgage loans held for sale $ 583,000 $ 383,000  
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    
Certificates of deposit in other banks $ 12,247,000 $ 3,460,000  
Federal corporate income tax rate 21.00% 34.00% 34.00%
Amounts reclassified from accumulated other comprehensive loss per ASU 2018-02 $ 0 $ 0  
Retained Earnings      
Summary Of Significant Accounting Policies      
Amounts reclassified from accumulated other comprehensive loss per ASU 2018-02   1,218,000  
Accumulated Other Comprehensive Loss      
Summary Of Significant Accounting Policies      
Amounts reclassified from accumulated other comprehensive loss per ASU 2018-02   $ (1,218,000)  
Buildings and improvements | Minimum      
Summary Of Significant Accounting Policies      
Estimated useful lives 5 years    
Buildings and improvements | Maximum      
Summary Of Significant Accounting Policies      
Estimated useful lives 40 years    
Furniture and Fixtures | Minimum      
Summary Of Significant Accounting Policies      
Estimated useful lives 3 years    
Furniture and Fixtures | Maximum      
Summary Of Significant Accounting Policies      
Estimated useful lives 15 years    
Federal Home Loan Bank of Des Moines      
Summary Of Significant Accounting Policies      
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%