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Condensed Financial Information of Parent Company - Condensed Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Assets        
Other assets, net $ 110,137 $ 67,807    
Total assets 11,282,450 11,529,153    
Liabilities 9,288,352 9,677,963    
Stockholders' equity 1,994,098 1,851,190 $ 1,069,266 $ 990,862
Total liabilities and stockholders' equity 11,282,450 11,529,153    
Parent Company [Member]        
Assets        
Investment in subsidiaries 2,003,692 1,865,609    
Other assets, net 42,070 31,628    
Total assets 2,045,762 1,897,237    
Liabilities 51,664 46,047    
Stockholders' equity 1,994,098 1,851,190    
Total liabilities and stockholders' equity $ 2,045,762 $ 1,897,237