Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 36,900	$ 36,900
Accumulated Amortization	(21,082)	(20,196)
Net Carrying Amount	15,818	16,704
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,550	33,550
Accumulated Amortization	(17,884)	(17,027)
Net Carrying Amount	15,666	16,523
Customer Relationship Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,350	3,350
Accumulated Amortization	(3,198)	(3,169)
Net Carrying Amount	$ 152	$ 181