NON-COVERED OTHER REAL ESTATE OWNED (Details) (USD $)	12 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2011 item	Dec. 31, 2010 item
Schedule of Non-Covered Other Real Estate Owned
Carrying value of OREO properties	$ 32,911,000	$ 29,350,000
Aggregate carrying value as of the foreclosure date	40,600,000	38,000,000
Write-downs recorded related to foreclosed assets	5,100,000	3,000,000
Number of OREO properties sold	47	51	79
Proceeds from sale of OREO properties	34,100,000	26,600,000	39,500,000
Net gain (loss) on sale of OREO properties	232,000	(151,000)	(145,000)
Recoveries From Sale of Non Covered Other Real Estate Owned	2,000,000
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
Percent of total	31.00%
Non-Covered Other Real Estate Owned Properties | Geographic Concentration | Nevada
Schedule of Non-Covered Other Real Estate Owned
Percent of total	42.00%