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Deposits - Components of Deposits (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deposits, by Component, Alternative [Abstract]      
Demand, non-interest bearing $ 2,356,998 $ 1,343,391  
Demand, interest bearing 2,384,691 1,235,292  
Savings, including money market deposit accounts 5,916,309 4,401,719  
Time, $100,000 and over 470,923 402,161  
Time, other 181,008 1,266,373  
Total deposits $ 11,309,929 $ 8,648,936 $ 7,142,236