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Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Interest-bearing Deposit Liabilities [Abstract]    
Interest-bearing demand deposits(1) $ 8,838,710 $ 6,470,570
Money market accounts(1) 15,277,829 11,227,134
Savings accounts 1,168,672 918,109
Time deposits(1) 4,358,100 6,920,213
Brokered deposits 3,570,406 3,429,993
Total interest-bearing deposits 33,213,717 28,966,019
Aggregate amount of time deposits of $250,000 or more 1,820,000 $ 2,630,000
Time Deposits, by Maturity [Abstract]    
Maturing within one year 4,016,764  
Between 1 - 2 years 1,303,259  
2 - 3 years 505,709  
3 - 4 years 33,768  
4 - 5 years 80,242  
Thereafter 8,454  
Total $ 5,948,196