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Summary of Significant Accounting Policies (Details) - USD ($)
12 Months Ended
Jul. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Summary Of Significant Accounting Policies        
Mortgage loans held for sale   $ 5,100,000 $ 428,000  
Sustained period of repayment performance for non-accrual TDRs   6 months    
Depreciation methods   straight-line and accelerated methods    
Period of employees highest compensation before retirement   10 years    
Tax liabilities related to uncertain tax positions   $ 0 0 $ 0
Interest or penalties recognized related to uncertain tax positions   $ 0 $ 0 $ 0
Dividends Payable, Date to be Paid Jul. 01, 2020      
Special stock dividend, rate percent 4.00%      
Special stock dividend, record date Jun. 15, 2020      
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%