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Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2019
Aug. 15, 2019
Dec. 31, 2018
Goodwill [Line Items]      
Goodwill $ 147,013   $ 79,749
Pegasus Bank [Member]      
Goodwill [Line Items]      
Date of acquisition Aug. 15, 2019    
Goodwill $ 67,264 $ 67,300