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Deposits - Total interest bearing deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Deposits [Abstract]    
Savings accounts $ 10,010,003 $ 9,722,824
NOW, money market and other interest bearing demand deposits 15,181,266 13,221,415
Total savings, NOW, money market and other interest bearing demand deposits 25,191,269 22,944,239
Certificates of deposit:    
Under $100,000 3,240,635 3,260,330
$100,000 and over 4,672,629 4,356,434
Total certificates of deposit 7,913,264 7,616,764
Total interest bearing deposits $ 33,104,533 $ 30,561,003