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Note Deposits (Total interest bearing deposits) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Deposits [Abstract]    
Savings accounts $ 9,956,864 $ 9,722,824
NOW, money market and other interest bearing demand deposits 14,071,106 13,221,415
Total savings, NOW, money market and other interest bearing demand deposits 24,027,970 22,944,239
Certificates of deposit:    
Under $100,000 3,257,147 3,260,330
$100,000 and over 4,548,617 4,356,434
Total certificates of deposit 7,805,764 7,616,764
Total interest bearing deposits $ 31,833,734 $ 30,561,003