FAIR VALUE (Details 6) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Financial Liabilities:
Other borrowings		$ 20,000
Maximum term of maturity for securities purchased under resale agreements to be included in cash and cash equivalents	90 days
Term of maturity that securities purchased under resale agreements must exceed to be included in certain fair value calculations	90 days
Maximum term of maturity for carrying amount of securities sold under repurchase agreements to approximate fair value	90 days
Carrying Amount or Notional Amount
Financial Assets:
Cash and cash equivalents	1,050,214	1,323,106
Short-term investments	330,438	366,378
Securities purchased under resale agreements	1,450,000	1,450,000
Investment securities available-for-sale	2,667,172	2,607,029
Loans held for sale	245,026	174,317
Loans receivable, net	15,768,530	14,645,785
Investment in Federal Home Loan Bank stock	86,139	107,275
Investment in Federal Reserve Bank stock	48,111	48,003
Accrued interest receivable	109,822	94,837
Foreign exchange options	85,614	85,614
Interest rate swaps	1,320,438	1,190,793
Short-term foreign exchange contracts	256,233	112,459
Financial Liabilities:
Demand, savings and money market deposits	13,329,875	12,187,740
Time deposits	5,952,332	6,121,614
Federal Home Loan Bank advances	314,022	312,975
Securities sold under repurchase agreements	995,000	995,000
Other borrowings		20,000
Accrued interest payable	9,360	10,855
Long-term debt	137,178	137,178
Derivatives liabilities	1,835,911	1,392,494
Estimated Fair Value
Financial Assets:
Cash and cash equivalents	1,050,214	1,323,106
Short-term investments	330,438	366,378
Securities purchased under resale agreements	1,429,937	1,442,302
Investment securities available-for-sale	2,667,172	2,607,029
Loans held for sale	252,894	180,349
Loans receivable, net	15,255,089	14,743,218
Investment in Federal Home Loan Bank stock	86,139	107,275
Investment in Federal Reserve Bank stock	48,111	48,003
Accrued interest receivable	109,822	94,837
Foreign exchange options	5,460	5,011
Interest rate swaps	22,353	36,943
Short-term foreign exchange contracts	2,896	896
Financial Liabilities:
Demand, savings and money market deposits	13,329,875	12,187,740
Time deposits	5,941,410	6,115,530
Federal Home Loan Bank advances	306,521	333,060
Securities sold under repurchase agreements	1,163,468	1,173,830
Other borrowings		20,000
Accrued interest payable	9,360	10,855
Long-term debt	83,527	83,762
Derivatives liabilities	$ 33,667	$ 42,060