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Stockholders' Equity - Discussion of Acquisition (Details) - USD ($)
$ / shares in Units, $ in Thousands
Jul. 29, 2016
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Dec. 31, 2015
Business Acquisition [Line Items]          
Total stockholders’ equity   $ 1,878,047 $ 1,855,473 $ 961,982 $ 938,095
Wilshire Bancorp, Inc          
Business Acquisition [Line Items]          
Entity shares Issued per acquiree share 0.7034        
Stock issued for acquisitions 55,500,000        
Share price $ 15.37        
Hope common stock issued in exchange for Wilshire common stock $ 852,939        
Hope stock options issued in exchange Wilshire stock options $ 3,370