Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 36,900	$ 36,900
Accumulated Amortization	(25,490)	(23,742)
Net Carrying Amount	11,410	13,158
Core Deposit Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,550	33,550
Accumulated Amortization	(22,168)	(20,454)
Net Carrying Amount	11,382	13,096
Customer Relationship Intangibles [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,350	3,350
Accumulated Amortization	(3,322)	(3,288)
Net Carrying Amount	$ 28	$ 62