Goodwill and Other Intangibles - Additional Information (Detail) - USD ($) $ in Thousands			9 Months Ended	12 Months Ended
	Nov. 18, 2022	Mar. 28, 2022	Sep. 30, 2023	Dec. 31, 2022
Finite Lived Intangible Assets [Line Items]
Deposit acquired	$ 383,000	$ 226,800
Branch acquisition		7,700		$ 7,707
Customer relationship intangible asset	67,000
Loan acquired		43,000
Core deposit intangible asset		$ 2,300
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Branch acquisition	$ 25,200