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Goodwill and Other Intangible Assets - Schedule of Amortizable Intangible Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 12,944 $ 12,908
Accumulated Amortization (7,424) (6,325)
Net Carrying Value 5,520 6,583
Core Deposits [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value 9,626 9,626
Accumulated Amortization (5,286) (4,330)
Net Carrying Value 4,340 5,296
Other [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross Carrying Value 3,318 3,282
Accumulated Amortization (2,138) (1,995)
Net Carrying Value $ 1,180 $ 1,287