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Deposits - Interest Bearing Deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Amount    
Money market $ 9,620,876 $ 8,687,766
Savings 707,546 702,342
Certificates of deposit 12,299,717 9,551,974
Deposits - interest bearing $ 22,628,139 $ 18,942,082
Qtr.-End Weighted Average Stated Rate    
Money market 2.29% 2.46%
Savings 1.87% 2.00%
Certificates of deposit 2.60% 2.74%