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Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract]          
Goodwill $ 76,851   $ 76,851   $ 76,851
Amortization of core deposit intangible assets 235 $ 26 475 $ 59  
Aggregate mortgage servicing rights amortization $ 56 $ 27 $ 95 $ 43