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Condensed Financial Information of Parent Company - Condensed Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Assets        
Other assets, net $ 67,807 $ 25,317    
Total assets 11,529,153 8,270,586    
Liabilities 9,677,963 7,201,320    
Stockholders' equity 1,851,190 1,069,266 $ 990,862 $ 923,399
Total liabilities and stockholders' equity 11,529,153 8,270,586    
Parent Company [Member]        
Assets        
Investment in subsidiaries 1,865,609 1,084,332    
Other assets, net 31,628 26,703    
Total assets 1,897,237 1,111,035    
Liabilities 46,047 41,769    
Stockholders' equity 1,851,190 1,069,266    
Total liabilities and stockholders' equity $ 1,897,237 $ 1,111,035