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Goodwill and Core Deposit Intangible - Additional Information (Detail) - USD ($)
$ in Thousands
 9 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Goodwill And Intangible Assets Disclosure [Line Items]    
Goodwill $ 8,853 $ 8,853
Core deposit intangible assets 1,546 $ 1,825
Goodwill tax deductible $ 8,900  
Goodwill amortization period 15 years  
Core Deposits [Member]    
Goodwill And Intangible Assets Disclosure [Line Items]    
Core deposit intangible assets $ 4,200  
Intangible assets amortized year 10 years