DERIVATIVE FINANCIAL INSTRUMENTS (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012		Dec. 31, 2011
Designated as Hedging Instrument
Fair Values of Derivative Instruments
Notional amount	$ 200,000		$ 200,000
Derivative assets	766	[1]	998	[1]
Derivative liabilities	1,109	[1]	639	[1]
Designated as Hedging Instrument | Interest rate swaps
Fair Values of Derivative Instruments
Notional amount	200,000		200,000
Derivative assets	766	[1]	998	[1]
Derivative liabilities	1,109	[1]	639	[1]
Not Designated as Hedging Instrument
Fair Values of Derivative Instruments
Notional amount	992,956		803,814
Derivative assets	24,610	[1]	24,980	[1]
Derivative liabilities	24,182	[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	204	[1]	202	[1]
Derivative liabilities	204	[1]	204	[1]
Not Designated as Hedging Instrument | Foreign exchange options
Fair Values of Derivative Instruments
Notional amount	85,614		85,614
Derivative assets	4,695	[1]	3,899	[1]
Derivative liabilities	2,918	[1]	2,430	[1]
Not Designated as Hedging Instrument | Interest rate swaps
Fair Values of Derivative Instruments
Notional amount	533,735		485,196
Derivative assets	17,666	[1]	19,476	[1]
Derivative liabilities	17,999	[1]	19,924	[1]
Not Designated as Hedging Instrument | Short-term Foreign Exchange
Fair Values of Derivative Instruments
Notional amount	200,898		210,295
Derivative assets	2,045	[1]	1,403	[1]
Derivative liabilities	1,561	[1]	967	[1]
Not Designated as Hedging Instrument | Short-term Call Option
Fair Values of Derivative Instruments
Notional amount	150,000
Derivative liabilities	$ 1,500	[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.