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Condensed Financial Information of Parent Company - Condensed Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Assets        
Other assets, net $ 23,832 $ 21,585    
Total assets 8,073,707 7,671,200 $ 7,377,920  
Liabilities 7,082,845 6,747,801    
Stockholders' equity 990,862 923,399 $ 878,109 $ 771,887
Total liabilities and stockholders' equity 8,073,707 7,671,200    
Parent Company [Member]        
Assets        
Investment in subsidiaries 1,005,160 939,064    
Other assets, net 24,754 23,642    
Total assets 1,029,914 962,706    
Liabilities 39,052 39,307    
Stockholders' equity 990,862 923,399    
Total liabilities and stockholders' equity $ 1,029,914 $ 962,706