FAIR VALUE (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Investment securities available-for-sale
Total investment securities available-for-sale	$ 2,733,797		$ 2,607,029
U.S. Treasury securities
Investment securities available-for-sale
Total investment securities available-for-sale	491,632		460,677
U.S. Government agency and U.S. Government sponsored enterprise debt securities
Investment securities available-for-sale
Total investment securities available-for-sale	394,323		197,855
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Investment securities available-for-sale
Total investment securities available-for-sale	178,870		180,665
U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Investment securities available-for-sale
Total investment securities available-for-sale	885,237		1,144,085
Municipal securities
Investment securities available-for-sale
Total investment securities available-for-sale	280,979		167,093
Other residential mortgage-backed securities: | Investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	46,327
Other commercial mortgage-backed securities: | Investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	51,617		17,084
Corporate debt securities | Investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	309,995		411,983
Corporate debt securities | Non-investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	15,101	[1]	17,417	[1]
Other securities
Investment securities available-for-sale
Total investment securities available-for-sale	79,716		10,170
Fair Value Measurements
Derivative
Derivatives liabilities	0		(42,060)
Fair Value, Measurements, Recurring | Fair Value Measurements
Investment securities available-for-sale
Total investment securities available-for-sale	2,733,797		2,607,029
Derivative
Derivatives liabilities	(50,262)		(42,060)
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign exchange options
Derivative
Derivative assets	6,290		5,011
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps
Derivative
Derivative assets	28,078		36,943
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign exchange contracts
Derivative
Foreign exchange contracts	6,181		896
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. Treasury securities
Investment securities available-for-sale
Total investment securities available-for-sale	491,632		460,677
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. Government agency and U.S. Government sponsored enterprise debt securities
Investment securities available-for-sale
Total investment securities available-for-sale	394,323		197,855
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Investment securities available-for-sale
Total investment securities available-for-sale	178,870		180,665
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Investment securities available-for-sale
Total investment securities available-for-sale	885,237		1,144,085
Fair Value, Measurements, Recurring | Fair Value Measurements | Municipal securities
Investment securities available-for-sale
Total investment securities available-for-sale	280,979		167,093
Fair Value, Measurements, Recurring | Fair Value Measurements | Other residential mortgage-backed securities: | Investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	46,327
Fair Value, Measurements, Recurring | Fair Value Measurements | Other commercial mortgage-backed securities: | Investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	51,617		17,084
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities | Investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	309,995		411,983
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities | Non-investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	15,101		17,417
Fair Value, Measurements, Recurring | Fair Value Measurements | Other securities
Investment securities available-for-sale
Total investment securities available-for-sale	79,716		10,170
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Investment securities available-for-sale
Total investment securities available-for-sale	491,632		460,677
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities
Investment securities available-for-sale
Total investment securities available-for-sale	491,632		460,677
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Investment securities available-for-sale
Total investment securities available-for-sale	2,235,794		2,141,552
Derivative
Derivatives liabilities	(46,607)		(39,008)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange options
Derivative
Derivative assets	6,290		5,011
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps
Derivative
Derivative assets	28,078		36,943
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts
Derivative
Foreign exchange contracts	6,181		896
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government agency and U.S. Government sponsored enterprise debt securities
Investment securities available-for-sale
Total investment securities available-for-sale	394,323		197,855
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Investment securities available-for-sale
Total investment securities available-for-sale	178,870		180,665
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Government agency and U.S. Government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Investment securities available-for-sale
Total investment securities available-for-sale	885,237		1,144,085
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities
Investment securities available-for-sale
Total investment securities available-for-sale	280,979		167,093
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other residential mortgage-backed securities: | Investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	46,327
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other commercial mortgage-backed securities: | Investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	51,617		17,084
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	309,995		411,983
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Non-investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	8,730		12,617
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other securities
Investment securities available-for-sale
Total investment securities available-for-sale	79,716		10,170
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale
Total investment securities available-for-sale	6,371		4,800
Derivative
Derivatives liabilities	(3,655)		(3,052)
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Non-investment grade
Investment securities available-for-sale
Total investment securities available-for-sale	$ 6,371		$ 4,800

[1] For 2013, the Company did not record any OTTI. For 2012, the Company recorded $99 thousand, on a pre-tax basis, of the credit portion of OTTI through earnings and $5.1 million of the non-credit portion of OTTI for pooled trust preferred securities in other comprehensive income.