Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 36,900	$ 36,648
Accumulated Amortization	(19,309)	(16,665)
Net Carrying Amount	17,591	19,983
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,550	33,298
Accumulated Amortization	(16,170)	(13,615)
Net Carrying Amount	17,380	19,683
Customer Relationship Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,350	3,350
Accumulated Amortization	(3,139)	(3,050)
Net Carrying Amount	$ 211	$ 300