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Condensed Financial Information of Parent Company - Condensed Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Assets        
Other assets, net $ 25,317 $ 23,832    
Total assets 8,270,586 8,073,707 $ 7,671,200  
Liabilities 7,201,320 7,082,845    
Stockholders' equity 1,069,266 990,862 $ 923,399 $ 878,109
Total liabilities and stockholders' equity 8,270,586 8,073,707    
Parent Company [Member]        
Assets        
Investment in subsidiaries 1,084,332 1,005,160    
Other assets, net 26,703 24,754    
Total assets 1,111,035 1,029,914    
Liabilities 41,769 39,052    
Stockholders' equity 1,069,266 990,862    
Total liabilities and stockholders' equity $ 1,111,035 $ 1,029,914