DERIVATIVE FINANCIAL INSTRUMENTS AND BALANCE SHEET OFFSETTING (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012
Designated as Hedging Instrument
Fair Values of Derivative Instruments
Notional amount	$ 70,000		$ 50,000
Derivative liabilities	2,821	[1]	1,521	[1]
Designated as Hedging Instrument | Interest rate swaps
Fair Values of Derivative Instruments
Notional amount	70,000		50,000
Derivative liabilities	2,821	[1]	1,521	[1]
Not Designated as Hedging Instrument
Fair Values of Derivative Instruments
Notional amount	1,468,947		1,388,866
Derivative assets	40,835	[1]	42,850	[1]
Derivative liabilities	38,203	[1]	40,539	[1]
Not Designated as Hedging Instrument | Foreign exchange options
Fair Values of Derivative Instruments
Notional amount	85,614		85,614
Derivative assets	5,340	[1]	5,011	[1]
Derivative liabilities	3,233	[1]	3,052	[1]
Not Designated as Hedging Instrument | Interest rate swaps
Fair Values of Derivative Instruments
Notional amount	1,244,393		1,190,793
Derivative assets	34,192	[1]	36,943	[1]
Derivative liabilities	33,832	[1]	36,799	[1]
Not Designated as Hedging Instrument | Short-term Foreign Exchange
Fair Values of Derivative Instruments
Notional amount	138,940		112,459
Derivative assets	1,303	[1]	896	[1]
Derivative liabilities	1,138	[1]	688	[1]
Gross aggregate value of assets and liabilities	$ 461		$ 495

[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.