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Deposits - Total interest bearing deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Deposits [Abstract]    
Savings accounts $ 13,227,332 $ 10,618,629
NOW, money market and other interest bearing demand deposits 21,403,290 16,305,007
Total savings, NOW, money market and other interest bearing demand deposits 34,630,622 26,923,636
Certificates of deposit:    
Under $100,000 3,077,257 3,133,840
$100,000 and over 4,767,672 4,540,957
Total certificates of deposit 7,844,929 7,674,797
Total interest bearing deposits $ 42,475,551 $ 34,598,433