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Deposits - Total interest bearing deposits (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Deposits [Abstract]    
Savings accounts $ 10,801,188 $ 10,618,629
NOW, money market and other interest bearing demand deposits 16,071,715 16,305,007
Total savings, NOW, money market and other interest bearing demand deposits 26,872,903 26,923,636
Certificates of deposit:    
Under $100,000 3,088,350 3,133,840
$100,000 and over 5,439,474 4,540,957
Total certificates of deposit 8,527,824 7,674,797
Total interest bearing deposits $ 35,400,727 $ 34,598,433