CUSTOMER DEPOSIT ACCOUNTS (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Customer deposit account balances
Noninterest-bearing demand	$ 4,535,877,000	$ 3,492,795,000
Interest-bearing checking	1,230,372,000	971,179,000
Money market accounts	5,000,309,000	4,678,409,000
Savings deposits	1,421,182,000	1,164,618,000
Total core deposits	12,187,740,000	10,307,001,000
Time deposits:
Less than $100,000	1,884,577,000	2,186,604,000
$100,000 or greater	4,237,037,000	4,959,397,000
Total time deposits	6,121,614,000	7,146,001,000
Total deposits	18,309,354,000	17,453,002,000
Time deposits $100 thousand or greater held by the Company's foreign branch located in Hong Kong	$ 319,300,000	$ 264,600,000