NON-COVERED LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 6) (USD $)	3 Months Ended		12 Months Ended
	Mar. 31, 2012		Dec. 31, 2011
Impaired loans disclosures
Unpaid principal balance	$ 161,192,000		$ 279,181,000
Recorded investment	134,854,000		219,580,000
Related allowance	5,952,000		13,041,000
Average recorded investment	138,914,000		252,418,000
Interest income recognized (cash basis)	701,000	[1]	3,519,000	[1]
With Related Allowance
Impaired loans disclosures
Recorded investment	18,700,000		30,405,000
No Related Allowance
Impaired loans disclosures
Recorded investment	116,154,000		189,175,000
Residential | Single-family
Impaired loans disclosures
Unpaid principal balance	5,428,000		10,248,000
Recorded investment	4,571,000		9,113,000
Related allowance			1,131,000
Average recorded investment	5,186,000		9,408,000
Interest income recognized (cash basis)			65,000	[1]
Residential | Single-family | With Related Allowance
Impaired loans disclosures
Recorded investment			2,535,000
Residential | Single-family | No Related Allowance
Impaired loans disclosures
Recorded investment	4,571,000		6,578,000
Residential | Multifamily
Impaired loans disclosures
Unpaid principal balance	26,651,000		37,450,000
Recorded investment	24,041,000		31,792,000
Related allowance	683,000		1,124,000
Average recorded investment	24,441,000		35,855,000
Interest income recognized (cash basis)	107,000	[1]	473,000	[1]
Residential | Multifamily | With Related Allowance
Impaired loans disclosures
Recorded investment	2,025,000		3,520,000
Residential | Multifamily | No Related Allowance
Impaired loans disclosures
Recorded investment	22,016,000		28,272,000
Commercial Real Estate ("CRE") | Income producing
Impaired loans disclosures
Unpaid principal balance	51,633,000		69,664,000
Recorded investment	42,549,000		63,642,000
Related allowance	1,050,000		1,187,000
Average recorded investment	44,072,000		68,087,000
Interest income recognized (cash basis)	255,000	[1]	1,030,000	[1]
Commercial Real Estate ("CRE") | Income producing | With Related Allowance
Impaired loans disclosures
Recorded investment	5,274,000		7,941,000
Commercial Real Estate ("CRE") | Income producing | No Related Allowance
Impaired loans disclosures
Recorded investment	37,275,000		55,701,000
Commercial Real Estate ("CRE") | Construction
Impaired loans disclosures
Unpaid principal balance	34,819,000		75,714,000
Recorded investment	28,053,000		46,480,000
Related allowance	220,000		815,000
Average recorded investment	28,447,000		64,398,000
Interest income recognized (cash basis)	153,000	[1]	1,099,000	[1]
Commercial Real Estate ("CRE") | Construction | With Related Allowance
Impaired loans disclosures
Recorded investment	472,000		1,067,000
Commercial Real Estate ("CRE") | Construction | No Related Allowance
Impaired loans disclosures
Recorded investment	27,581,000		45,413,000
Commercial Real Estate ("CRE") | Land
Impaired loans disclosures
Unpaid principal balance	19,527,000		40,615,000
Recorded investment	17,140,000		34,498,000
Related allowance	2,030,000		3,949,000
Average recorded investment	17,486,000		36,002,000
Interest income recognized (cash basis)	41,000	[1]	341,000	[1]
Commercial Real Estate ("CRE") | Land | With Related Allowance
Impaired loans disclosures
Recorded investment	8,139,000		8,692,000
Commercial Real Estate ("CRE") | Land | No Related Allowance
Impaired loans disclosures
Recorded investment	9,001,000		25,806,000
Commercial and Industrial ("C&I") | Commercial Business
Impaired loans disclosures
Unpaid principal balance	17,861,000		38,857,000
Recorded investment	13,284,000		27,422,000
Related allowance	1,969,000		4,835,000
Average recorded investment	13,999,000		32,033,000
Interest income recognized (cash basis)	145,000	[1]	484,000	[1]
Commercial and Industrial ("C&I") | Commercial Business | With Related Allowance
Impaired loans disclosures
Recorded investment	2,790,000		6,650,000
Commercial and Industrial ("C&I") | Commercial Business | No Related Allowance
Impaired loans disclosures
Recorded investment	10,494,000		20,772,000
Commercial and Industrial ("C&I") | Trade finance
Impaired loans disclosures
Unpaid principal balance	2,042,000		4,127,000
Recorded investment	2,042,000		4,127,000
Average recorded investment	2,083,000		4,127,000
Commercial and Industrial ("C&I") | Trade finance | No Related Allowance
Impaired loans disclosures
Recorded investment	2,042,000		4,127,000
Consumer | Student loans
Impaired loans disclosures
Unpaid principal balance	782,000		257,000
Recorded investment	782,000		257,000
Average recorded investment	782,000		257,000
Consumer | Student loans | No Related Allowance
Impaired loans disclosures
Recorded investment	782,000		257,000
Consumer | Other Consumer
Impaired loans disclosures
Unpaid principal balance	2,449,000		2,249,000
Recorded investment	2,392,000		2,249,000
Average recorded investment	2,418,000		2,251,000
Interest income recognized (cash basis)			27,000	[1]
Consumer | Other Consumer | No Related Allowance
Impaired loans disclosures
Recorded investment	$ 2,392,000		$ 2,249,000

[1] Excludes interest from performing TDRs.