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Goodwill and Intangible Assets - Schedule of Acquired Intangible Assets, Other than Goodwill (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Acquired Finite-Lived Intangible Assets [Line Items]    
Net Carrying Amount $ 8,309  
Core deposit intangibles [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Amount 12,668 $ 12,668
Accumulated Amortization 7,298 6,178
Net Carrying Amount $ 5,370 $ 6,490