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Summary of Significant Accounting Policies (Details) - USD ($)
12 Months Ended
Jul. 01, 2021
Jul. 01, 2020
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Summary Of Significant Accounting Policies          
Loans held for sale     $ 2,249,000 $ 5,099,000  
Sustained period of repayment performance for non-accrual TDRs     6 months    
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
Special stock dividend, rate percent (in percent) 4.00%        
Special stock dividend, record date   Jun. 15, 2021      
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 (in percent)     0.12%    
Investment in capital stock of Federal Home Loan Bank required percentage of advances (in percent)     4.00%