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Deposits - Total interest bearing deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Deposits [Abstract]    
Savings accounts $ 10,602,678 $ 9,722,824
NOW, money market and other interest bearing demand deposits 16,995,390 13,221,415
Total savings, NOW, money market and other interest bearing demand deposits 27,598,068 22,944,239
Certificates of deposit:    
Under $100,000 3,259,238 3,260,330
$100,000 and over 4,536,919 4,356,434
Total certificates of deposit 7,796,157 7,616,764
Total interest bearing deposits $ 35,394,225 $ 30,561,003