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Deposits - Summary of Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Banking and Thrift [Abstract]    
Noninterest-bearing $ 7,959,455 $ 3,921,710
Interest-bearing 6,260,136 2,452,954
Total checking 14,219,591 6,374,664
Savings 8,362,170 6,122,257
Money market 3,621,729 1,193,782
Certificates of deposit 6,949,082 3,797,241
Brokered deposits 2,133,502 1,415,742
Total deposits $ 35,286,074 $ 18,903,686