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Deposits - Additional Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Banking and Thrift, Other Disclosures [Abstract]          
Deposits $ 21,124,376   $ 21,124,376   $ 22,666,039
Brokered deposits 11,500,000   11,500,000   11,900,000
Retail and other deposits 9,600,000   9,600,000   10,800,000
Stable interest-bearing deposits, total 7,900,000   7,900,000   7,100,000
Brokered deposit placement fee 4,000 $ 5,000 8,000 $ 10,000  
Third party broker fees paid 1,000 $ 1,000 1,000 $ 3,000  
Deposits exceeding FDIC insurance limits 587,000   587,000   571,000
Accrued interest on deposits $ 41,000   $ 41,000   $ 50,000