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Deposits - Summary of Total Deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Banking and Thrift, Other Disclosures [Abstract]    
Deposits - interest bearing $ 21,121,810 $ 22,664,899
Deposits - non-interest bearing 2,566 1,140
Total deposits $ 21,124,376 $ 22,666,039