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Income Taxes - Components of Pre-tax Income and Provision for Income Taxes (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Provision for income taxes:
Currently payable	$ 5,476	$ 3,222	$ 4,849
Deferred income tax expense (benefit)	(321)	(48)	89
Provision for income taxes	5,155	3,174	4,938
Expected tax expense, at the U.S. federal statutory income tax rate of 21%	4,562	2,835	4,397
State income taxes	692	378	742
Foreign-derived intangible income benefit	(120)	(55)	(201)	$ (100)
Other, net	21	16
Provision for income taxes	$ 5,155	$ 3,174	$ 4,938

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