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Deposits - Summary of Major Types of Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Banking and Thrift, Other Disclosures [Abstract]    
Non-interest-bearing $ 2,240,799 $ 1,377,396
Interest-bearing checking 3,317,296 2,539,428
Money market deposit 691,872 578,147
Savings 1,471,554 898,174
Time deposits 1,561,767 935,632
Total deposits $ 9,283,288 $ 6,328,777