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Deposits - Interest Bearing Deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Amount    
Money market $ 9,079,766 $ 8,687,766
Savings 704,259 702,342
Certificates of deposit 11,391,997 9,551,974
Deposits - interest bearing $ 21,176,022 $ 18,942,082
Qtr.-End Weighted Average Stated Rate    
Money market 2.56% 2.46%
Savings 2.04% 2.00%
Certificates of deposit 2.85% 2.74%