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Acquisitions - Security California Bancorp - Narrative (Details)
$ / shares in Units, $ in Thousands
3 Months Ended
Jan. 31, 2016
USD ($)
bank
shares
Jun. 30, 2016
USD ($)
Mar. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
Jan. 29, 2016
USD ($)
$ / shares
Business Acquisition [Line Items]          
Assets     $ 4,174,428 $ 4,036,311  
Total gross loans     3,382,447 3,245,694  
Deposits     $ 3,297,073 3,145,581  
Closing stock price of common stock ($ per share) | $ / shares     $ 38.55   $ 20.53
Goodwill     $ 102,490 $ 102,490  
Adjustment   $ 146      
Security California Bancorp          
Business Acquisition [Line Items]          
Assets $ 714,000        
Total gross loans 456,000        
Deposits $ 637,000        
Equity issued (shares) 0.9629        
Consideration paid $ 120,174        
Cash consideration $ 788        
Number Of branches | bank 6        
Goodwill $ 51,658        
Common Stock | Security California Bancorp          
Business Acquisition [Line Items]          
Number of shares of common stock issued as consideration | shares 5,815,051        
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned         $ 119,000