Defined Contribution Benefit Plan - Additional Information (Detail) - 401(k) Defined Contribution Plan [Member] - USD ($)			12 Months Ended
	Jan. 01, 2010	Oct. 01, 2004	Dec. 31, 2021	Dec. 31, 2020
Defined Contribution Plan Disclosure [Line Items]
Maximum pretax annual compensation, percentage	5.00%	15.00%
Employee's contribution, percentage	2.00%
Defined contribution plan, description			The Bank matches dollar for dollar up to 3% of the employee’s contribution and then fifty cents on the dollar on the next two percentage points up to the employee contribution of 5%.
Amount matched by bank			$ 492,578	$ 478,960
Maximum [Member]
Defined Contribution Plan Disclosure [Line Items]
Bank matches of employee's contribution, percentage of match	3.00%