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Summary of Significant Accounting Policies (Details)
12 Months Ended
Jan. 27, 2021
shares
Jan. 23, 2020
shares
Dec. 31, 2020
USD ($)
Segment
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Loans [Abstract]          
Contractually past due period for delinquent loans     90 days    
Other Real Estate Owned [Abstract]          
Other real estate owned     $ 0 $ 0  
Impairment of Long-Lived Assets and Long-Lived Assets to Be Disposed Of [Abstract]          
Identifiable intangible assets     $ 0    
Key assumptions used in measuring the fair value of mortgage servicing rights [Abstract]          
Constant prepayment rate     20.22% 12.10%  
Discount rate     10.00% 10.01%  
Weighted average life     3 years 11 months 15 days 5 years 6 months  
Advertising Costs [Abstract]          
Advertising costs     $ 418,000 $ 434,000 $ 373,000
Segment Reporting [Abstract]          
Number of segments | Segment     1    
Risk Rating of 5 (Special Mention) or Worse [Member]          
Allowance for Loan Losses [Abstract]          
Threshold aggregate exposure for loan to be reviewed for impairment     $ 500,000    
Subsequent Event [Member]          
Stock Dividend [Abstract]          
Dividends, date declared Jan. 27, 2021        
Stock dividend percentage 5.00%        
Dividend paid date Mar. 25, 2021        
Dividends payable, date of record Feb. 26, 2021        
Minimum [Member]          
Allowance for Loan Losses [Abstract]          
Past due period after which a loan is charged off     90 days    
Buildings and Improvements [Member] | Minimum [Member]          
Premises and Equipment [Abstract]          
Useful lives used in computing depreciation     15 years    
Buildings and Improvements [Member] | Maximum [Member]          
Premises and Equipment [Abstract]          
Useful lives used in computing depreciation     50 years    
Furniture and Equipment [Member] | Minimum [Member]          
Premises and Equipment [Abstract]          
Useful lives used in computing depreciation     3 years    
Furniture and Equipment [Member] | Maximum [Member]          
Premises and Equipment [Abstract]          
Useful lives used in computing depreciation     10 years    
CARES Act [Member] | Minimum [Member]          
Impact of Recently Issued Accounting Standards [Abstract]          
Term of payment deferrals     3 months    
CARES Act [Member] | Maximum [Member]          
Impact of Recently Issued Accounting Standards [Abstract]          
Term of payment deferrals     6 months    
Consumer Loans [Member]          
Allowance for Loan Losses [Abstract]          
Period of delinquency after which a loan is charged off     90 days    
Dividend Declared in 2020 Annual [Member]          
Stock Dividend [Abstract]          
Dividends, date declared     Jan. 23, 2020    
Stock dividend percentage   5.00%      
Stock dividend (in shares) | shares   616,506      
Dividend paid date     Mar. 25, 2020    
Dividends payable, date of record     Feb. 28, 2020    
Dividend Declared in 2021 Annual [Member] | Subsequent Event [Member]          
Stock Dividend [Abstract]          
Dividends, date declared Jan. 27, 2021        
Stock dividend percentage 5.00%        
Stock dividend (in shares) | shares 649,260        
Dividend paid date Mar. 25, 2021        
Dividends payable, date of record Feb. 26, 2021