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Deposits - Total interest bearing deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Deposits [Abstract]    
Savings accounts $ 12,632,255 $ 10,618,629
NOW, money market and other interest bearing demand deposits 20,559,841 16,305,007
Total savings, NOW, money market and other interest bearing demand deposits 33,192,096 26,923,636
Certificates of deposit:    
Under $100,000 3,173,952 3,133,840
$100,000 and over 4,957,742 4,540,957
Total certificates of deposit 8,131,694 7,674,797
Total interest bearing deposits $ 41,323,790 $ 34,598,433