Benefit Plans - Options Outstanding and Options Exercisable by Exercise Price with Weighted-Average Remaining Contractual Life for Options Outstanding and Weighted-Average Exercise Price (Detail) - Exercise Price 30-35 [Member]	12 Months Ended
	Dec. 31, 2023 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Exercise Price Lower Range Limit	$ 30
Exercise Price Upper Range Limit	$ 35
Options Outstanding, Number | shares	240
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	2 months 1 day
Options Outstanding, Weighted-Average Grant Date Value	$ 34.57
Options Exercisable, Number | shares	240
Options Exercisable, Weighted-Average Grant Date Value	$ 34.57
Exercise Price Lower Range Limit	30
Exercise Price Upper Range Limit	$ 35
Options Outstanding, Number | shares	240
Options Outstanding, Weighted-Average Remaining Contractual Life (Years)	2 months 1 day
Options Outstanding, Weighted-Average Grant Date Value	$ 34.57
Options Exercisable, Number | shares	139,350
Options Exercisable, Weighted-Average Grant Date Value	$ 34.57