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Intangible Assets and Goodwill - Summary of Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount $ 36,900 $ 36,900
Accumulated Amortization (26,352) (23,742)
Net Carrying Amount 10,548 13,158
Core Deposit Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 33,550 33,550
Accumulated Amortization (23,024) (20,454)
Net Carrying Amount 10,526 13,096
Customer Relationship Intangibles [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 3,350 3,350
Accumulated Amortization (3,328) (3,288)
Net Carrying Amount $ 22 $ 62