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Deposits - Interest Bearing Deposits (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Amount    
Money market $ 5,125,507 $ 4,886,299
Savings 679,511 669,254
Certificates of deposit 5,737,374 5,931,453
Deposits - interest bearing $ 11,542,392 $ 11,487,006
Weighted Average Stated Rate    
Money market 1.22% 1.19%
Savings 0.82% 0.82%
Certificates of deposit 1.19% 0.98%