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Goodwill and Core Deposit Intangibles - Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Nov. 01, 2017
Apr. 01, 2017
Goodwill [Line Items]            
Goodwill $ 493,329,000 $ 493,329,000 $ 102,490,000 $ 50,832,000    
Goodwill acquired during the year   390,839,000 51,658,000      
Impairment losses 0 0 0      
Net CDI 43,014,000 43,014,000 9,451,000 7,170,000    
Additions due to acquisitions   39,707,000 $ 4,320,000 $ 2,906,000    
Estimated aggregate amortization expense            
2018 8,400,000 8,400,000        
2019 7,300,000 7,300,000        
2020 6,500,000 6,500,000        
2021 5,400,000 5,400,000        
2022 4,500,000 4,500,000        
Plaza Bancorp            
Goodwill [Line Items]            
Goodwill 121,885,000 121,885,000     $ 122,000,000  
Additions due to acquisitions   11,600,000        
Heritage Oaks Bank            
Goodwill [Line Items]            
Goodwill $ 268,954,000 268,954,000       $ 269,000,000
Additions due to acquisitions   $ 28,100,000