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Acquisitions (Details Textual) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Oct. 20, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]        
Common Stock, Par or Stated Value Per Share   $ 0.01 $ 0.01  
Goodwill   $ 2,548,670 $ 2,548,670  
Acquisition, integration and reorganization costs   $ 349 $ 1,770 $ 19,735
CU Bancorp        
Business Acquisition [Line Items]        
Cash paid $ 224,338      
Assets acquired 3,458,128      
Liabilities assumed 2,787,557      
Goodwill 374,721      
Business Combination, Consideration Transferred 670,571      
Loans and leases 2,075,890      
Common Stock [Member]        
Business Acquisition [Line Items]        
Stock Issued During Period, Shares, Acquisitions       9,298,451
Core Deposits [Member] | CU Bancorp        
Business Acquisition [Line Items]        
Liabilities assumed $ 2,700,000