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Business Combinations - Summary of Estimated Fair Value Adjustments Resulting in Goodwill (Detail) - USD ($)
$ in Thousands
Jul. 06, 2018
Sep. 30, 2019
Dec. 31, 2018
Jul. 05, 2018
Business Acquisition [Line Items]        
Goodwill   $ 220,872 $ 220,972  
FNBB        
Business Acquisition [Line Items]        
Value of stock consideration paid to FNB Bancorp Shareholders $ 284,437      
Cash consideration 6,695      
Cost basis net assets acquired (114,030)      
Investments (1,081)      
Premises and equipment 21,590      
Core deposit intangible 27,327      
Deferred income taxes (6,394)      
Other 1,489      
Goodwill 156,561     $ 156,661
FNBB | Loans        
Business Acquisition [Line Items]        
Loans $ (22,390)