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Acquisitions (Details Textual) - CU Bancorp [Member] - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2018
Oct. 20, 2017
Business Combination Recognized Identifiable Assets Acquired And Liabilities Assumed Loans And Leases Receivable Net Reported Amount Covered And Not Covered   $ 2,100.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   2,800.0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets   3,500.0
CU Bancorp [Member]    
Goodwill, Acquired During Period $ 374.7  
Core Deposits [Member]    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities   $ 2,700.0