CUSTOMER DEPOSITS (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Core deposits:
Noninterest-bearing demand	$ 8,656,805	$ 7,381,030
Interest-bearing checking	3,336,293	2,545,618
Money market	6,932,962	6,318,120
Savings deposits	1,933,026	1,651,267
Total core deposits	20,859,086	17,896,035
Time deposits:
Less than $100,000	1,434,767	1,662,046
$100,000 or greater	5,182,128	4,450,693
Total time deposits	6,616,895	6,112,739
Total deposits	27,475,981	24,008,774
Time Deposits [Line Items]
Amounts in excess of FDIC insurance limit	3,170,000	2,400,000
Hong Kong and China
Time Deposits [Line Items]
Amounts in excess of FDIC insurance limit	444,100	350,100
Hong Kong
Time Deposits [Line Items]
Time deposits $100 thousand or greater held by the Company's foreign branch located in Hong Kong	191,000	133,300
China
Time Deposits [Line Items]
Time deposits $100 thousand or greater held by the Company's foreign branch located in Hong Kong	$ 267,000	$ 233,900