VARIABLE INTEREST ENTITIES FAIR VALUE OF FINANCIAL INSTRUMENTS (Details) RSO (USD $) In Thousands, unless otherwise specified	3 Months Ended				12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011 Asset	Dec. 31, 2013 RSO [Member]	Dec. 31, 2012 RSO [Member]	Dec. 31, 2011 RSO [Member]	Dec. 31, 2013 RSO [Member] Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]	Dec. 31, 2012 RSO [Member] Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]	Dec. 31, 2011 RSO [Member] Fair Value, Measurements, Nonrecurring [Member] Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Transfers into level 3						$ 94,895
Impairment loss included in earnings						328	42	4,600
Other than Temporary Impairment Losses, Number of Impaired Assets					1
Provision for loan losses	$ 1,000	$ 4,500	$ 6,300	$ 5,700		$ 3,020	$ 16,818	$ 13,896	$ 3,100	$ 7,800	$ 11,400