BORROWINGS Borrowings - - Additional Information (Details) (USD $) In Thousands, unless otherwise specified			3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Maximum
Debt Instrument [Line Items]
Federal Home Loan Bank short-term borrowings	$ 502,200	$ 502,000
Securities Sold under Agreements to Repurchase	$ 65,000	$ 65,000
Securities Sold under Agreements to Repurchase, Remaining Contractual Term			3 years
Assets Sold under Agreements to Repurchase, Interest Rate	3.50%	3.50%