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Deposits - Interest Bearing Deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Amount    
Money market $ 7,167,473 $ 7,129,404
Savings 847,714 834,521
Certificates of deposit 5,778,013 5,471,065
Deposits - interest bearing $ 13,793,200 $ 13,434,990
Weighted Average Stated Rate    
Money market 1.55% 1.22%
Savings 0.99% 0.84%
Certificates of deposit 1.73% 1.41%