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Deposits - Total interest bearing deposits (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Deposits [Abstract]    
Savings accounts $ 14,599,535 $ 14,031,736
NOW, money market and other interest bearing demand deposits 22,623,197 22,398,057
Total savings, NOW, money market and other interest bearing demand deposits 37,222,732 36,429,793
Certificates of deposit:    
Under $100,000 2,877,209 2,917,700
$100,000 and over 4,379,312 4,390,148
Total certificates of deposit 7,256,521 7,307,848
Total interest bearing deposits $ 44,479,253 $ 43,737,641