COVERED ASSETS AND FDIC INDEMNIFICATION ASSET (Details 5) (USD $)					3 Months Ended			6 Months Ended									6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended			0 Months Ended
	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2014 Covered loans accounted for under ASC 310-10	Dec. 31, 2013 Covered loans accounted for under ASC 310-10	Jun. 30, 2014 Covered loans		Jun. 30, 2013 Covered loans	Jun. 30, 2014 Covered loans		Jun. 30, 2013 Covered loans	Dec. 31, 2013 Covered loans		Jun. 30, 2014 Covered loans Covered Advances	Dec. 31, 2013 Covered loans Covered Advances	Jun. 30, 2014 Covered loans PCI Covered Loans	Dec. 31, 2013 Covered loans PCI Covered Loans	Jun. 30, 2014 Covered loans Covered OREO Properties item	Dec. 31, 2013 Covered loans Covered OREO Properties	Jun. 30, 2014 Covered loans Covered OREO Properties Geographic Concentration California	Dec. 31, 2013 Covered loans Covered OREO Properties Geographic Concentration California	Jun. 30, 2014 Covered loans Covered OREO Properties Geographic Concentration Massachusetts	Dec. 31, 2013 Covered loans Covered OREO Properties Geographic Concentration Massachusetts	Jun. 30, 2014 Covered loans Covered OREO Properties Geographic Concentration Washington	Jun. 30, 2014 Covered loans United Commercial Bank (UCB) item	Dec. 31, 2013 Covered loans United Commercial Bank (UCB)	Nov. 06, 2009 Covered loans United Commercial Bank (UCB) Covered loans acquired from specific acquiree Geographic Concentration California	Nov. 06, 2009 Covered loans United Commercial Bank (UCB) Covered loans acquired from specific acquiree Geographic Concentration New York	Nov. 06, 2009 Covered loans United Commercial Bank (UCB) Covered loans acquired from specific acquiree Geographic Concentration Hong Kong
Credit Risk and Concentrations
Percentage of the entity's total covered loans acquired from a specific counterparty																								94.00%	94.00%
Percent of total																			24.00%	31.00%	26.00%	31.00%	22.00%			64.00%	11.00%	10.00%
Number of general geographic regions																								3
Covered Nonperforming Assets
Covered nonaccrual loans			$ 14,300,000	$ 17,700,000	$ 86,771,000	[1],[2],[3]		$ 86,771,000	[1],[2],[3]		$ 126,895,000	[1],[2],[3]	$ 14,300,000	$ 17,700,000	$ 72,500,000	$ 109,200,000
Other real estate owned covered, net	24,779,000	21,373,000			24,779,000			24,779,000			21,373,000
Total covered nonperforming assets					111,550,000			111,550,000			148,268,000
Percentage of any reimbursable expense recorded as interest income under ASC 310-30					80.00%			80.00%			80.00%
Covered loans past due 90 days or more but not on nonaccrual					0			0			0
Covered nonaccrual loans			14,300,000	17,700,000	86,771,000	[1],[2],[3]		86,771,000	[1],[2],[3]		126,895,000	[1],[2],[3]	14,300,000	17,700,000	72,500,000	109,200,000
Covered OREO balances																	24,800,000	21,400,000
Number of covered OREO properties added during the period																	10
Aggregate carrying value of covered OREO properties added during the period																	19,600,000
Net valuation adjustments included in aggregate carrying value on covered OREO properties																	465,000	2,400,000
Number of covered OREO properties sold during the period																	10
Total proceeds value of covered OREO properties sold during the period																	17,700,000
Total net gains (losses) on covered OREO properties sold during the period																	2,000,000
Covered TDR activity
Balance at beginning of period					73,234,000		141,923,000	116,007,000		157,736,000
Additions					704,000		3,709,000	787,000		25,793,000
Transfers to covered OREO					(1,230,000)			(1,230,000)
Charge-offs					(500,000)		(3,762,000)	(1,323,000)		(7,466,000)
Paydowns/ Reductions					(13,414,000)		(21,622,000)	(54,217,000)		(55,815,000)
Balance at end of period					60,024,000		120,248,000	60,024,000		120,248,000
Changes in the accretable yield for the covered loans
Balance at beginning of period					424,005,000		503,476,000	461,545,000		556,986,000
Accretion					(64,114,000)		(84,811,000)	(125,304,000)		(166,438,000)
Changes in expected cash flows					27,236,000		40,052,000	50,886,000		68,169,000
Balance at end of period					387,127,000		458,717,000	387,127,000		458,717,000
Covered assets - other disclosures
Amount reclassified from nonaccretable yield to accretable yield due to changes in loss rate assumptions					19,600,000		26,000,000	38,600,000		39,500,000
Amount of loans removed from the covered loans accounted for under ASC 310-30, excluding scheduled principal payments								353,700,000		392,700,000
Loan discount related to payoffs and removals of loans								$ 51,100,000		$ 74,300,000

[1] Covered nonaccrual loans include loans that meet the criteria for nonaccrual but have a yield accreted through interest income under ASC 310-30. All losses on covered loans are 80% reimbursed by the FDIC.

[2] Net of discount.

[3] Includes $14.3 million and $17.7 million of covered advances as of June 30, 2014 and December 31, 2013, respectively; and $72.5 million and $109.2 million of PCI loans as of June 30, 2014 and December 31, 2013, respectively.