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Retirement Plans - Additional Information (Detail) - USD ($)
2 Months Ended 3 Months Ended
Feb. 28, 2017
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 29, 2016
Defined Benefit Plan Disclosure [Line Items]          
Employer contribution for first 3% of employee contributions   100.00%      
Employer contribution for next 2% of employee contributions   50.00%      
Effective date of ceased matching employer contribution   May 16, 2020      
Percentage of first specified employee contributions   3.00%      
Percentage of next specified employee contributions   2.00%      
Contribution for retirement plan   $ 0 $ 32,853    
Maximum amount allocated to purchase common stock under ESOP         $ 5,000,000.0
Number of common stock, shares purchased 682,500        
Purchased common stock, value $ 4,900,000        
Total number of ESOP shares   178,251      
Fair value of ESOP released from suspense account and recognized compensation cost   $ 620,313      
Compensation cost recognized   $ 22,086 $ 56,516    
Number of non committed, unearned ESOP shares   501,237   509,069  
Fair value of unallocated ESOP shares   $ 1,744,305   $ 1,272,672  
Number of ESOP shares allocated   170,419   170,419  
Number of ESOP shares committed to be released   7,832      
ESOP [Member]          
Defined Benefit Plan Disclosure [Line Items]          
Number of common stock, shares purchased   682,500      
Purchased common stock, value   $ 4,900,000