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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract]      
Goodwill $ 76,851   $ 76,851
Amortization of core deposit intangible assets $ 231 $ 240