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Business Combinations - Summary of Estimated Fair Value Adjustments Resulting in Goodwill (Detail) - USD ($)
$ in Thousands
Jul. 06, 2018
Dec. 31, 2019
Dec. 31, 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    
FNBB | Loans      
Business Acquisition [Line Items]      
Loans $ (22,390)