BUSINESS COMBINATIONS (Details) (USD $)	12 Months Ended	1 Months Ended	6 Months Ended		1 Months Ended				12 Months Ended	1 Months Ended
	Dec. 31, 2011	Jun. 30, 2010 Washington First International Bank (WFIB)	Dec. 31, 2010 Washington First International Bank (WFIB)	Jun. 11, 2010 Washington First International Bank (WFIB)	Jun. 30, 2010 Washington First International Bank (WFIB) Commercial mortgage loans Y	Jun. 30, 2010 Washington First International Bank (WFIB) Single-family residential mortgage loans Y	Jun. 30, 2010 Washington First International Bank (WFIB) Maximum D Y	Nov. 30, 2009 United Commercial Bank (UCB)	Dec. 31, 2010 United Commercial Bank (UCB)	Nov. 30, 2009 United Commercial Bank (UCB) Commercial mortgage loans Y	Nov. 30, 2009 United Commercial Bank (UCB) Single-family residential mortgage loans Y	Nov. 30, 2009 United Commercial Bank (UCB) Maximum D
Business Combinations
Period of accrued interest on loans that will be covered by FDIC under shared loss agreements (in days)							90					90
Percentage of losses absorbed by FDIC under shared loss agreements	80.00%	80.00%						80.00%
Percentage of loss recoveries shared by FDIC under shared loss agreements		80.00%						80.00%
Threshold amount of losses absorbed by FDIC under shared loss agreements								$ 2,050,000,000
Period for which shared-loss agreements are in effect (in years)					5	10				5	10
Period for which loss recovery provisions are in effect (in years)					8	10				8	10
Cash received from FDIC		51,700,000
Fair value of assets acquired				492,600,000				9,860,000,000
Percentage of losses absorbed by FDIC under shared loss agreements exceeding $2.05 billion								95.00%
Percentage of loss recoveries shared by FDIC under shared loss agreements exceeding $2.05 billion								95.00%
Book value of assets transferred to the bank				486,300,000
Pre-tax bargain purchase gain		19,500,000	1,600,000					471,000,000	5,000,000
After-tax bargain purchase gain		$ 11,300,000
Measurement period (in years)							1