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Acquisitions - Heritage Oaks Bancorp - Narrative (Details)
$ / shares in Units, $ in Thousands
Apr. 01, 2017
USD ($)
shares
Jun. 30, 2017
USD ($)
Mar. 31, 2017
$ / shares
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jan. 29, 2016
$ / shares
Business Acquisition [Line Items]            
Assets   $ 6,440,631   $ 4,036,311    
Gross loans   4,864,883   3,245,694 $ 2,927,554  
Deposits   4,946,431   3,145,581    
Closing stock price of common stock ($ per share) | $ / shares     $ 38.55     $ 20.53
Goodwill   $ 370,564   $ 102,490    
Heritage Oaks Bancorp            
Business Acquisition [Line Items]            
Assets $ 2,015,137          
Gross loans 1,400,000          
Deposits $ 1,700,000          
Equity issued (shares) 0.3471          
Consideration paid $ 464,982          
Cash consideration 3,900          
Goodwill $ 268,075          
Heritage Oaks Bancorp | Common Stock            
Business Acquisition [Line Items]            
Number of shares of common stock issued as consideration | shares 11,959,022