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Retirement Plans - Additional Information (Detail) - USD ($)
 2 Months Ended 3 Months Ended 6 Months Ended
Feb. 28, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Dec. 29, 2016
Jan. 01, 2016
Compensation And Retirement Disclosure [Abstract]                
Employer contribution for first 3% of employee contributions       100.00%        
Employer contribution for next 2% of employee contributions       50.00%        
Percentage of first specified employee contributions       3.00%        
Percentage of next specified employee contributions       2.00%        
Contribution for retirement plan   $ 45,856 $ 21,257 $ 21,618 $ 45,945      
Maximum amount allocated to purchase common stock under ESOP             $ 5,000,000 $ 5,000,000
Number of ESOP shares allocated or committed to be released   16,984   16,984        
Fair value of ESOP shares allocated or committed to be released from suspense account   $ 121,305   $ 121,305        
Number of common stock, shares purchased 682,500              
Purchased common stock, value $ 4,900,000     117,966        
Fair value of unallocated ESOP shares   $ 4,500,000   $ 4,500,000   $ 0