FAIR VALUE (Details 6) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Dec. 31, 2013
Financial Assets:
Investment securities available-for-sale	$ 2,529,652	$ 2,733,797
Financial Liabilities:
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
Financial Assets:
Cash and cash equivalents	1,246,044	895,820
Short-term investments	286,130	257,473
Securities purchased under resale agreements	1,275,000	1,300,000
Investment securities available-for-sale	2,529,652	2,733,797
Loans held for sale	450,864	204,970
Loans receivable, net	19,828,801	17,600,613
Investment in Federal Home Loan Bank stock	37,731	62,330
Investment in Federal Reserve Bank stock	54,217	48,333
Accrued interest receivable	100,323	116,314
Foreign exchange options	6,049	6,290
Interest rate swaps and caps	30,233	28,078
Foreign exchange contracts	4,499	6,181
Financial Liabilities:
Demand, savings and money market deposits	16,643,474	14,588,570
Time deposits	6,231,615	5,824,348
Federal Home Loan Bank advances	316,156	315,092
Securities sold under repurchase agreements	1,005,211	995,000
Accrued interest payable	11,020	11,178
Long-term debt	235,732	226,868
Derivatives liabilities	48,388	50,262
Estimated Fair Value
Financial Assets:
Cash and cash equivalents	1,246,044	895,820
Short-term investments	286,130	257,473
Securities purchased under resale agreements	1,266,730	1,279,406
Investment securities available-for-sale	2,529,652	2,733,797
Loans held for sale	462,397	212,469
Loans receivable, net	19,211,124	16,741,674
Investment in Federal Home Loan Bank stock	37,731	62,330
Investment in Federal Reserve Bank stock	54,217	48,333
Accrued interest receivable	100,323	116,314
Foreign exchange options	6,049	6,290
Interest rate swaps and caps	30,233	28,078
Foreign exchange contracts	4,499	6,181
Financial Liabilities:
Demand, savings and money market deposits	16,643,474	14,588,570
Time deposits	6,212,638	5,791,659
Federal Home Loan Bank advances	337,621	308,521
Securities sold under repurchase agreements	1,128,491	1,134,774
Accrued interest payable	11,020	11,178
Long-term debt	204,101	184,415
Derivatives liabilities	$ 48,388	$ 50,262