FAIR VALUE MEASUREMENTS (Details 2) (Private label CMOs, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013
Activity for assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Balance at the beginning of the period	$ 44,684
Total realized in earnings	402
Total unrealized gain in comprehensive income	246
Net settlements	(1,547)
Balance at the end of the period	$ 43,785
Recurring basis | Level 3 | Minimum
Information about quantitative unobservable inputs, assumptions and valuation methodology used to evaluate the fair values
Voluntary annual prepayment speeds (as a percent)	0.13%
Annual default rates (as a percent)	0.00%
Loss severity rates (as a percent)	0.00%
Discount rates (as a percent)	0.00%
Recurring basis | Level 3 | Maximum
Information about quantitative unobservable inputs, assumptions and valuation methodology used to evaluate the fair values
Voluntary annual prepayment speeds (as a percent)	33.90%
Annual default rates (as a percent)	15.10%
Loss severity rates (as a percent)	65.90%
Discount rates (as a percent)	12.90%
Recurring basis | Level 3 | Weighted average
Information about quantitative unobservable inputs, assumptions and valuation methodology used to evaluate the fair values
Voluntary annual prepayment speeds (as a percent)	9.40%
Annual default rates (as a percent)	3.20%
Loss severity rates (as a percent)	40.40%
Discount rates (as a percent)	5.10%