Fair Value Disclosures - Contingent Consideration Liability Change in Amount (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Change in Contingent Consideration Liability [Roll Forward]
Beginning balance	$ 1,765	$ 1,629
Contingent consideration from new acquisition	0	0
Payment of contingent consideration	635	0
Adjustment of contingent consideration	94	136
Ending balance	1,224	1,765
Paul I. Sheaffer Insurance Agency [Member]
Change in Contingent Consideration Liability [Roll Forward]
Beginning balance	1,765	1,629
Contingent consideration from new acquisition	0	0
Payment of contingent consideration	635	0
Adjustment of contingent consideration	94	136
Ending balance	$ 1,224	$ 1,765