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Compensation and Benefit Plans - Summary of ESOP Shares (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]      
Shares committed-to-be released 36,189 48,250 36,189
Shares to be allocated to participants 96,500 48,250  
Unallocated shares 591,062 627,251  
Total 723,751 723,751  
Fair value of unearned shares $ 8,310 $ 7,991