FAIR VALUE MEASUREMENTS (Details 2) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Private label CMOs
Activity for assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3)
Covered private label CMOs, beginning of year	$ 45,149,000	$ 50,437,000	$ 52,125,000
Total realized in earnings	340,000	2,097,000	1,058,000
Total unrealized gain (loss) in comprehensive income	4,883,000	(846,000)	5,411,000
Net settlements	(5,688,000)	(6,539,000)	(8,157,000)
Covered private label CMOs, end of year	44,684,000	45,149,000	50,437,000
Other-than-temporary impairment loss	$ 1,100,000	$ 0	$ 874,000
Recurring basis | Level 3 | Private label CMOs | Minimum
Information about quantitative unobservable inputs, assumptions and valuation methodology used to evaluate the fair values
Voluntary prepayment speeds (as a percent)	0.00%
Monthly default rates (as a percent)	0.00%
Loss severity rates (as a percent)	0.00%
Discount rates (as a percent)	0.80%
Recurring basis | Level 3 | Private label CMOs | Maximum
Information about quantitative unobservable inputs, assumptions and valuation methodology used to evaluate the fair values
Voluntary prepayment speeds (as a percent)	33.70%
Monthly default rates (as a percent)	14.20%
Loss severity rates (as a percent)	65.50%
Discount rates (as a percent)	17.70%
Recurring basis | Level 3 | Private label CMOs | Weighted average
Information about quantitative unobservable inputs, assumptions and valuation methodology used to evaluate the fair values
Voluntary prepayment speeds (as a percent)	10.10%
Monthly default rates (as a percent)	3.70%
Loss severity rates (as a percent)	39.70%
Discount rates (as a percent)	5.00%
Nonrecurring basis | Level 3 | Minimum | SBA loan servicing asset | Discounted cash flow
Information about quantitative unobservable inputs, assumptions and valuation methodology used to evaluate the fair values
Voluntary prepayment speeds (as a percent)	3.69%
Discount rates (as a percent)	9.68%
Nonrecurring basis | Level 3 | Maximum | SBA loan servicing asset | Discounted cash flow
Information about quantitative unobservable inputs, assumptions and valuation methodology used to evaluate the fair values
Voluntary prepayment speeds (as a percent)	17.04%
Discount rates (as a percent)	12.58%