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Retirement Plans - Additional Information (Detail) - USD ($)	2 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Feb. 28, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018	Dec. 31, 2017	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%
Percentage of first specified employee contributions				3.00%
Percentage of next specified employee contributions				2.00%
Contribution for retirement plan		$ 12,892	$ 12,568	$ 63,453	$ 61,607
Maximum amount allocated to purchase common stock under ESOP								$ 5,000,000
Number of common stock, shares purchased	682,500			0		0	682,500
Purchased common stock, value	$ 4,900,000						$ 4,900,000
Total number of ESOP shares				94,894	59,893
Fair value of ESOP released from suspense account and recognized compensation cost				$ 634,843	$ 416,088
Compensation cost recognized				$ 170,700	$ 173,856
Number of non committed, unearned ESOP shares		584,594		584,594		613,194
Fair value of unallocated ESOP shares		$ 3,910,932		$ 3,910,932		$ 3,440,020
Number of ESOP shares allocated		66,308		66,308		33,832
Number of ESOP shares committed to be released		28,586		28,586		35,474
ESOP [Member]
Defined Benefit Plan Disclosure [Line Items]
Number of common stock, shares purchased				682,500
Purchased common stock, value				$ 4,900,000

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The shares or units in an ESOP trust that have been assigned to individual participant accounts based on a known formula. IRS rules require allocations to be nondiscriminatory generally based on compensation, length of service, or a combination of both. For any particular participant such shares or units may be vested, unvested, or partially vested.

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