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Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 36,900 $ 36,900
Accumulated Amortization (24,628) (23,742)
Net Carrying Amount 12,272 13,158
Core Deposit Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 33,550 33,550
Accumulated Amortization (21,311) (20,454)
Net Carrying Amount 12,239 13,096
Customer Relationship Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 3,350 3,350
Accumulated Amortization (3,317) (3,288)
Net Carrying Amount $ 33 $ 62