Loans Receivable And Allowance For Credit Losses (Details) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	$ 6,477,497,000		$ 6,253,234,000
Financing Receivable, Deferred Fees, Net	6,736,000		2,860,000
Total allowance for loan losses	(149,673,000)	(161,273,000)
Net loans receivable	6,334,560,000		6,101,749,000
Individually evaluated for impairment	131,796,000		126,257,000
Collectively evaluated for impairment	6,345,701,000		6,126,977,000
Individually evaluated for impairment	9,414,000		8,463,000
Collectively evaluated for impairment	140,259,000		145,882,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(154,345,000)	(177,458,000)
Provisions	0	4,000,000
Charge-offs	(7,174,000)	(25,690,000)
Recovery	2,502,000	5,505,000
Ending balance, June 30	(149,673,000)	(161,273,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	8,002,000	10,029,000
Provisions	0	0
Charge-offs	(12,000)	(1,000)
Recoveries	0	0
Ending balance, June 30	7,990,000	10,028,000
Total credit allowance	157,663,000	171,301,000
FHLB and Federal Reserve [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans Pledged as Collateral	4,280,000,000		4,150,000,000
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	857,864,000		806,722,000
Total allowance for loan losses	(19,968,000)	(12,242,000)
Individually evaluated for impairment	0		9,134,000
Collectively evaluated for impairment	857,864,000		797,588,000
Individually evaluated for impairment	0		365,000
Collectively evaluated for impairment	19,968,000		19,482,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(19,847,000)	(15,197,000)
Provisions	960,000	(980,000)
Charge-offs	(1,019,000)	(2,187,000)
Recovery	180,000	212,000
Ending balance, June 30	(19,968,000)	(12,242,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	2,230,000	3,828,000
Provisions	(309,000)	(25,000)
Charge-offs	(12,000)	(1,000)
Recoveries	0	0
Ending balance, June 30	1,909,000	3,802,000
Total credit allowance	21,877,000	16,044,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	2,960,437,000		2,874,801,000
Total allowance for loan losses	(45,135,000)	(80,614,000)
Individually evaluated for impairment	83,454,000		68,317,000
Collectively evaluated for impairment	2,876,983,000		2,806,484,000
Individually evaluated for impairment	4,308,000		3,182,000
Collectively evaluated for impairment	40,827,000		44,912,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(48,094,000)	(91,722,000)
Provisions	(1,091,000)	(2,824,000)
Charge-offs	(2,923,000)	(11,518,000)
Recovery	1,055,000	3,234,000
Ending balance, June 30	(45,135,000)	(80,614,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	405,000	2,321,000
Provisions	(50,000)	(713,000)
Charge-offs	0	0
Recoveries	0	0
Ending balance, June 30	355,000	1,608,000
Total credit allowance	45,490,000	82,222,000
Commercial Real Estate [Member] | Investor CRE [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,163,821,000		1,219,847,000
Commercial Real Estate [Member] | Multifamily [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,725,403,000		1,580,289,000
Commercial Real Estate [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	71,213,000		74,665,000
Commercial [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,906,904,000		1,817,090,000
Total allowance for loan losses	(39,596,000)	(34,483,000)
Individually evaluated for impairment	48,342,000		48,312,000
Collectively evaluated for impairment	1,858,562,000		1,768,778,000
Individually evaluated for impairment	5,106,000		4,916,000
Collectively evaluated for impairment	34,490,000		36,958,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(41,874,000)	(38,046,000)
Provisions	(1,610,000)	4,458,000
Charge-offs	(1,588,000)	(9,533,000)
Recovery	920,000	1,512,000
Ending balance, June 30	(39,596,000)	(34,483,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	2,806,000	1,796,000
Provisions	(373,000)	665,000
Charge-offs	0	0
Recoveries	0	0
Ending balance, June 30	2,433,000	2,461,000
Total credit allowance	42,029,000	36,944,000
Commercial [Member] | Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,372,949,000		1,276,591,000
Commercial [Member] | Commercial & Industrial (C&I) [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	533,955,000		540,499,000
Consumer [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	752,292,000		754,621,000
Total allowance for loan losses	(25,817,000)	(14,160,000)
Individually evaluated for impairment	0		494,000
Collectively evaluated for impairment	752,292,000		754,127,000
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	25,817,000		25,602,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(25,602,000)	(13,427,000)
Provisions	1,512,000	2,638,000
Charge-offs	(1,644,000)	(2,452,000)
Recovery	347,000	547,000
Ending balance, June 30	(25,817,000)	(14,160,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	2,118,000	1,787,000
Provisions	604,000	(505,000)
Charge-offs	0	0
Recoveries	0	0
Ending balance, June 30	2,722,000	1,282,000
Total credit allowance	28,539,000	15,442,000
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	0		0
Total allowance for loan losses	(19,157,000)	(19,774,000)
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	0		0
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	19,157,000		18,928,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(18,928,000)	(19,066,000)
Provisions	229,000	708,000
Charge-offs	0	0
Recovery	0	0
Ending balance, June 30	(19,157,000)	(19,774,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	443,000	297,000
Provisions	128,000	578,000
Charge-offs	0	0
Recoveries	0	0
Ending balance, June 30	571,000	875,000
Total credit allowance	$ 19,728,000	$ 20,649,000