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Deposits - Total interest bearing deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deposits [Abstract]    
Savings accounts $ 14,031,736 $ 10,618,629
NOW, money market and other interest bearing demand deposits 22,398,057 16,305,007
Total savings, NOW, money market and other interest bearing demand deposits 36,429,793 26,923,636
Certificates of deposit:    
Under $100,000 2,917,700 3,133,840
$100,000 and over 4,390,148 4,540,957
Total certificates of deposit 7,307,848 7,674,797
Total interest bearing deposits $ 43,737,641 $ 34,598,433