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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 |  |

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