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FAIR VALUE (Details 6) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 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	1,322,383	1,323,106
Short-term investments	293,092	366,378
Securities purchased under resale agreements	1,300,000	1,450,000
Investment securities available-for-sale	2,892,761	2,607,029
Loans held for sale	232,309	174,317
Loans receivable, net	16,698,291	14,645,785
Investment in Federal Home Loan Bank stock	75,426	107,275
Investment in Federal Reserve Bank stock	48,212	48,003
Accrued interest receivable	113,350	94,837
Foreign exchange options	85,614	85,614
Interest rate swaps	1,496,204	1,190,793
Short-term foreign exchange contracts	291,876	112,459
Financial Liabilities:
Demand, savings and money market deposits	14,448,785	12,187,740
Time deposits	5,910,355	6,121,614
Federal Home Loan Bank advances	314,557	312,975
Securities sold under repurchase agreements	995,000	995,000
Other borrowings		20,000
Accrued interest payable	10,509	10,855
Long-term debt	187,178	137,178
Derivatives liabilities	1,929,944	1,392,494
Estimated Fair Value
Financial Assets:
Cash and cash equivalents	1,322,383	1,323,106
Short-term investments	293,092	366,378
Securities purchased under resale agreements	1,282,855	1,442,302
Investment securities available-for-sale	2,892,761	2,607,029
Loans held for sale	240,648	180,349
Loans receivable, net	15,914,095	14,743,218
Investment in Federal Home Loan Bank stock	75,426	107,275
Investment in Federal Reserve Bank stock	48,212	48,003
Accrued interest receivable	113,350	94,837
Foreign exchange options	5,955	5,011
Interest rate swaps	25,931	36,943
Short-term foreign exchange contracts	4,068	896
Financial Liabilities:
Demand, savings and money market deposits	14,448,785	12,187,740
Time deposits	5,955,631	6,115,530
Federal Home Loan Bank advances	307,998	333,060
Securities sold under repurchase agreements	1,153,869	1,173,830
Other borrowings		20,000
Accrued interest payable	10,509	10,855
Long-term debt	141,092	83,762
Derivatives liabilities	$ 38,552	$ 42,060

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