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Esop - Summary of Shares Held by Employee Stock Ownership Plan (ESOP) (Detail) - USD ($)
9 Months Ended 12 Months Ended
Mar. 02, 2015
Sep. 30, 2018
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Accrued for allocation to participants   33,780  
Earned ESOP shares   165,686 165,686
Shares withdrawn by former participants   (2,033)  
Unearned ESOP shares   400,768 434,548
Total ESOP shares 600,000 598,201 600,234
Fair value of unearned shares   $ 7,013,440 $ 6,127,127