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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]      
Goodwill $ 76,851 $ 76,851 $ 76,851
Amortization of core deposit intangible assets 240 33  
Aggregate mortgage servicing rights amortization $ 39 $ 16