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Employee Benefit Plans - Summary of Restricted Shares Issued, Vested and Forfeited (Detail)	12 Months Ended
	Dec. 31, 2023 Employee shares	Dec. 31, 2022 Employee shares	Dec. 31, 2021 Employee shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards, shares issued	64,225	56,496	48,750
Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards, shares issued	64,225	56,496	48,750
Restricted shares vested	32,427	26,900	18,845
Restricted shares awarded due to retirement	2,350	3,775	4,425
Restricted shares awarded for other	700
Restricted shares forfeited	6,350	8,000	2,575
Restricted shares issued | Employee	113	109	96
Restricted shares vested | Employee	69	60	50
Restricted shares awarded due to retirement | Employee	4	3	7
Restricted shares awarded for other | Employee	1
Restricted shares forfeited | Employee	8	9	4

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