DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012		Dec. 31, 2011
Designated as Hedging Instrument
Fair Values of Derivative Instruments
Notional amount	$ 100,000		$ 200,000
Derivative assets	234	[1]	998	[1]
Derivative liabilities	1,079	[1]	639	[1]
Designated as Hedging Instrument | Interest rate swaps
Fair Values of Derivative Instruments
Notional amount	100,000		200,000
Derivative assets	234	[1]	998	[1]
Derivative liabilities	1,079	[1]	639	[1]
Not Designated as Hedging Instrument
Fair Values of Derivative Instruments
Notional amount	1,152,459		803,814
Derivative assets	39,519	[1]	24,980	[1]
Derivative liabilities	37,770	[1]	23,525	[1]
Not Designated as Hedging Instrument | Equity swap agreements
Fair Values of Derivative Instruments
Notional amount	22,709		22,709
Derivative assets	205	[1]	202	[1]
Derivative liabilities	205	[1]	204	[1]
Not Designated as Hedging Instrument | Foreign exchange options
Fair Values of Derivative Instruments
Notional amount	85,614		85,614
Derivative assets	4,371	[1]	3,899	[1]
Derivative liabilities	2,729	[1]	2,430	[1]
Not Designated as Hedging Instrument | Interest rate swaps
Fair Values of Derivative Instruments
Notional amount	965,981		485,196
Derivative assets	33,825	[1]	19,476	[1]
Derivative liabilities	34,285	[1]	19,924	[1]
Not Designated as Hedging Instrument | Short-term Foreign Exchange
Fair Values of Derivative Instruments
Notional amount	78,155		210,295
Derivative assets	1,118	[1]	1,403	[1]
Derivative liabilities	$ 551	[1]	$ 967	[1]

[1] Derivative assets, which are a component of other assets, include the estimated settlement of the derivative asset position. Derivative liabilities, which are a component of other liabilities and deposits, include the estimated settlement of the derivative liability position.