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Condensed Financial Information of Parent Company - Condensed Balance Sheets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Assets        
Other assets, net $ 118,301 $ 127,697    
Total assets 15,883,697 14,419,314    
Liabilities 13,802,194 12,411,324    
Stockholders' equity 2,081,503 2,007,990 $ 1,994,098 $ 1,851,190
Total liabilities and stockholders' equity 15,883,697 14,419,314    
Parent Company [Member]        
Assets        
Investment in subsidiaries 2,038,948 1,990,166    
Other assets, net 67,998 68,679    
Total assets 2,106,946 2,058,845    
Liabilities 25,443 50,855    
Stockholders' equity 2,081,503 2,007,990    
Total liabilities and stockholders' equity $ 2,106,946 $ 2,058,845