NON-COVERED OTHER REAL ESTATE OWNED (Details) (USD $)	12 Months Ended
	Dec. 31, 2011 property	Dec. 31, 2010 property	Dec. 31, 2009 property
Schedule of Non-Covered Other Real Estate Owned
Number of OREO properties	37	30
Carrying value of OREO properties	$ 29,350,000	$ 21,865,000
Number of foreclosed properties	58	81
Aggregate carrying value as of the foreclosure date	38,000,000	57,300,000
Write-downs recorded related to foreclosed assets	3,000,000	7,000,000
Number of OREO properties sold	51	79	153
Carrying value of OREO properties sold			112,200,000
Proceeds from sale of OREO properties	26,600,000	39,500,000
Net loss on sale of OREO properties	(151,000)	(145,000)	(5,400,000)
Charges against the allowance for loan losses	$ 780,000	$ 2,600,000
Non-Covered Other Real Estate Owned Properties | Geographic Concentration | California
Schedule of Non-Covered Other Real Estate Owned
Percentage of OREO properties located in the Greater Los Angeles area and Inland Empire region of Southern California	62.00%	75.00%