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Business Combinations - Summary of Estimated Fair Value Adjustments Resulting in Goodwill (Detail) - USD ($)
$ in Thousands
Jul. 06, 2018
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Goodwill   $ 220,972 $ 64,311
FNBB [Member]      
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)    
Fair Value Adjustments, Premises and Equipment 21,590    
Core deposit intangible 27,327    
Deferred income taxes (6,394)    
Other 1,389    
Goodwill 156,661    
FNBB [Member] | Loans [Member]      
Business Acquisition [Line Items]      
Fair Value Adjustments $ (22,390)