STOCK COMPENSATION PLANS (Details) (USD $)	84 Months Ended		1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	May 31, 2012 Non-employee directors	Dec. 31, 2012 Restricted Stock	Dec. 31, 2011 Restricted Stock	Dec. 31, 2010 Restricted Stock
Stock Compensation Plans
Number of common shares authorized under the 2003 Plan	6,500,000
Number of common shares approved for issuance			11,850
Expenses charged to other noninterest expense			$ 300,000
Number of shares available for grant under the 2003 Plan	1,784,093
Unvested restricted stock, Number of Shares
Balance at the beginning of the period (in shares)		1,698,281		1,675,730	1,230,582	1,095,417
Granted (in shares)	2,537,892			226,400	692,900	443,050
Shares issued by the Company upon vesting (in shares)	(713,307)			(195,871)	(203,174)	(268,568)
Forfeited (in shares)	(126,304)			(7,978)	(44,578)	(39,317)
Balance at the end of the period (in shares)	1,698,281	1,698,281		1,698,281	1,675,730	1,230,582
Unvested restricted stock, Weighted Average Fair Value On Grant Date
Balance at the beginning of the period (in dollars per share)				$ 30.53	$ 35.86	$ 42.86
Granted (in dollars per share)				$ 23.77	$ 20.50	$ 19.99
Shares issued by the Company upon vesting (in dollars per share)				$ 21.69	$ 30.13	$ 36.78
Forfeited (in dollars per share)				$ 22.31	$ 23.56	$ 45.82
Balance at the end of the period (in dollars per share)				$ 30.68	$ 30.53	$ 35.86
Vesting date fair value of awards vested				$ 4,500,000	$ 3,700,000	$ 5,200,000