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Deposits - Interest Bearing Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Interest-bearing Deposit Liabilities, Domestic, by Component [Abstract]    
Money market $ 8,687,766 $ 7,731,966
Savings 702,342 738,243
Certificates of deposit 9,551,974 7,034,121
Deposits - interest bearing $ 18,942,082 $ 15,504,330
Year-End Weighted Average Stated Rate    
Money market 2.46% 1.80%
Savings 2.00% 1.10%
Certificates of deposit 2.74% 1.93%