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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)
 1 Months Ended 12 Months Ended
Jan. 01, 2019
Apr. 30, 2017
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2020
Dec. 31, 2018
Apr. 27, 2017
Summary Of Significant Accounting Policies [Line Items]              
Stock issued, price per share             $ 10.00
Shares sold as percentage of outstanding shares of common stock             46.00%
Basic and diluted earnings per share     $ 0.41 $ 0.05      
Net earnings     $ 3,088,000 $ 355,000      
Weighted average common shares outstanding     7,570,797 7,515,482      
Stockholders’ equity     $ 80,785,000 $ 77,167,000   $ 76,398,000  
ASU 606 adoption adjustment in stockholders' equity, tax     $ 50,650,000 $ 47,562,000      
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201409Member     us-gaap:AccountingStandardsUpdate201409Member      
Revision of Prior Period, Accounting Standards Update, Adjustment              
Summary Of Significant Accounting Policies [Line Items]              
Stockholders’ equity $ 164,000         164,000  
ASU 606 adoption adjustment in stockholders' equity, tax $ 57,000     $ 57,000      
ASU 2016-02              
Summary Of Significant Accounting Policies [Line Items]              
Change in accounting principle, accounting standards update, adopted [true false]     true        
Change in accounting principle, accounting standards update, immaterial effect [true false]     true        
Common Stock              
Summary Of Significant Accounting Policies [Line Items]              
Sale of common stock shares   3,467,595          
Stockholders’ equity     $ 77,000 $ 77,000   $ 75,000  
ESOP              
Summary Of Significant Accounting Policies [Line Items]              
Percentage of common stock purchased             3.92%
Community First Bancshares, MHC              
Summary Of Significant Accounting Policies [Line Items]              
Common stock ownership percentage         54.00%   54.00%