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Note Deposits (Total interest bearing deposits) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Deposits Abstract    
Savings accounts $ 7,467,000 $ 7,010,391
NOW, money market abd other interest bearing demand deposits 8,007,752 5,632,449
Total savings, NOW, money market and other interest bearing demand deposits 15,474,752 12,642,840
Time Deposits Abstract    
Under $100,000 3,668,667 4,014,359
$100,000 and over 4,233,339 4,151,009
Total certificates of deposit 7,902,006 8,165,368
Total interest bearing deposits $ 23,376,758 $ 20,808,208