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Deposits - Interest Bearing Deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Amount    
Money market $ 5,216,901 $ 4,886,299
Savings 666,918 669,254
Certificates of deposit 6,015,106 5,931,453
Deposits - interest bearing $ 11,898,925 $ 11,487,006
Weighted Average Stated Rate    
Money market 1.23% 1.19%
Savings 0.82% 0.82%
Certificates of deposit 1.19% 0.98%