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Deposits - Interest Bearing Deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Amount    
Money market $ 9,774,119 $ 9,616,547
Savings 817,229 718,616
Certificates of deposit 12,998,799 13,947,743
Deposits - interest bearing $ 23,590,147 $ 24,282,906
Qtr.-End Weighted Average Stated Rate    
Money market 0.99% 2.04%
Savings 0.97% 1.71%
Certificates of deposit 1.51% 2.44%