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Deposits - Summary of Total Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Banking and Thrift, Other Disclosures [Abstract]    
Deposits - interest bearing $ 23,109,438 $ 24,282,906
Deposits - non-interest bearing 485 1,077
Total deposits $ 23,109,923 $ 24,283,983