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Deposits - Additional Information (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Deposits [Abstract]    
Brokered deposits $ 800,000 $ 800,000
Overdrafts in demand deposit accounts reclassified to loans 3,000 3,000
Deposit    
Total deposits 58,742,801 $ 56,866,340
Public sector    
Deposit    
Total deposits $ 15,000,000