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Acquisitions - Narrative (Details)
$ / shares in Units, $ in Thousands, shares in Millions
3 Months Ended
Jan. 31, 2020
USD ($)
office
$ / shares
shares
Mar. 31, 2020
USD ($)
$ / shares
Dec. 31, 2019
USD ($)
Business Acquisition [Line Items]      
Closing price of Corporation's common stock | $ / shares $ 29.80 $ 18.84  
Assets   $ 11,976,209 $ 11,776,012
Total gross loans   8,754,869 8,722,311
Total deposits   9,093,072 8,898,509
Opus Bank | Opus Bank      
Business Acquisition [Line Items]      
Acquired company shareholders' ownership percentage 37.00%    
Opus Bank      
Business Acquisition [Line Items]      
Consideration paid $ 1,000,000 $ 653,300  
Stock transaction value (usd per share) | $ / shares $ 26.82 $ 16.96  
No par value (usd per share) | $ / shares $ 0    
Equity issued, ratio 0.9000    
Common stock issued as consideration (in shares) | shares 34.7    
Opus Bank | Opus Bank      
Business Acquisition [Line Items]      
Assets   $ 8,400,000  
Total gross loans   6,000,000  
Total deposits   $ 6,700,000  
Number of banking offices | office 46    
Opus Bank | Pacific Premier      
Business Acquisition [Line Items]      
Ownership percentage by existing Pacific Premier shareholders 63.00%    
Opus Bank | Pro Forma      
Business Acquisition [Line Items]      
Total assets acquired     $ 20,000,000