NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended	36 Months Ended	152 Months Ended
	Dec. 31, 2012 item	Dec. 31, 2012 item	Dec. 31, 2012 item	Dec. 31, 2011
NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
Number of acquisitions completed		4	25
Number of banking offices operated in San Francisco Bay area	3
Number of states where the entity has lease receivables	45
Percentage of real estate loans in the total gross non-covered and covered loan portfolio	71.00%
Loans and Leases Held for Sale and Servicing Assets
Servicing asset	$ 1.0	$ 1.0	$ 1.0	$ 1.3
SBA loans with servicing assets	$ 62.7	$ 62.7	$ 62.7	$ 70.6
Loans and Loan Fees
Period of days past due for loans to be placed on nonaccrual status	90 days
Period of days past due for leases to be placed on nonaccrual status	90 days
Period of time a restructured loan will remain on nonaccrual status	6 months
Minimum
Loans and Loan Fees
Period of days past due for loans to be considered as delinquent	30 days
Period of days past due for which delinquent loans may remain on accrual status	30 days
Maximum
Loans and Loan Fees
Period of days past due for which delinquent loans may remain on accrual status	89 days