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Condensed Financial Information of Parent Company - Condensed Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Assets        
Other assets, net $ 21,585 $ 25,500    
Total assets 7,671,200 7,377,920 $ 6,664,967  
Liabilities 6,747,801 6,499,811    
Stockholders' equity 923,399 878,109 $ 771,887 $ 762,970
Total liabilities and stockholders' equity 7,671,200 7,377,920    
Parent Company [Member]        
Assets        
Investment in subsidiaries 939,064 895,972    
Other assets, net 23,642 19,069    
Total assets 962,706 915,041    
Liabilities 39,307 36,932    
Stockholders' equity 923,399 878,109    
Total liabilities and stockholders' equity $ 962,706 $ 915,041