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Acquisitions - Loan Information (Details) - Acquired Loans - USD ($)
$ in Thousands
Jul. 01, 2018
Nov. 01, 2017
Apr. 01, 2017
Grandpoint Capital, Inc.      
Business Acquisition [Line Items]      
Contractual amounts due $ 3,496,905    
Cash flows not expected to be collected 39,230    
Expected cash flows 3,457,675    
Interest component of expected cash flows 1,105,287    
Fair value of acquired loans $ 2,352,388    
Plaza Bancorp      
Business Acquisition [Line Items]      
Contractual amounts due   $ 1,708,685  
Cash flows not expected to be collected   20,152  
Expected cash flows   1,688,533  
Interest component of expected cash flows   625,632  
Fair value of acquired loans   $ 1,062,901  
Heritage Oaks Bancorp      
Business Acquisition [Line Items]      
Contractual amounts due     $ 1,717,191
Cash flows not expected to be collected     4,442
Expected cash flows     1,712,749
Interest component of expected cash flows     348,061
Fair value of acquired loans     $ 1,364,688