Loans Receivable And Allowance For Credit Losses (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	$ 7,001,924,000		$ 7,001,924,000		$ 6,253,234,000
Financing Receivable, Deferred Fees, Net	8,891,000		8,891,000		2,860,000
Total allowance for loan losses	(141,949,000)	(158,244,000)	(141,949,000)	(158,244,000)
Net loans receivable	6,868,866,000		6,868,866,000		6,101,749,000
Individually evaluated for impairment	105,354,000		105,354,000		126,257,000
Collectively evaluated for impairment	6,896,570,000		6,896,570,000		6,126,977,000
Individually evaluated for impairment	4,532,000		4,532,000		8,463,000
Collectively evaluated for impairment	137,417,000		137,417,000		145,882,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(149,673,000)	(161,273,000)	(154,345,000)	(177,458,000)
Provisions	(2,600,000)	2,000,000	(2,600,000)	6,000,000
Charge-offs	(7,758,000)	(14,887,000)	(14,932,000)	(40,577,000)
Recovery	2,634,000	9,858,000	5,136,000	15,363,000
Ending balance, June 30	(141,949,000)	(158,244,000)	(141,949,000)	(158,244,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	7,990,000	10,028,000	8,002,000	10,029,000
Provisions	2,600,000	2,000,000	2,600,000	2,000,000
Charge-offs	(1,085,000)	(4,076,000)	(1,097,000)	(4,077,000)
Recoveries	0	0	0	0
Ending balance, June 30	9,505,000	7,952,000	9,505,000	7,952,000
Total credit allowance	151,454,000	166,196,000	151,454,000	166,196,000
FHLB and Federal Reserve [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans Pledged as Collateral	4,820,000,000		4,820,000,000		4,150,000,000
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	964,872,000		964,872,000		806,722,000
Total allowance for loan losses	(18,989,000)	(12,381,000)	(18,989,000)	(12,381,000)
Individually evaluated for impairment	0		0		9,134,000
Collectively evaluated for impairment	964,872,000		964,872,000		797,588,000
Individually evaluated for impairment	0		0		365,000
Collectively evaluated for impairment	18,989,000		18,989,000		19,482,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(19,968,000)	(12,242,000)	(19,847,000)	(15,197,000)
Provisions	(214,000)	(377,000)	746,000	(1,357,000)
Charge-offs	(1,107,000)	(157,000)	(2,126,000)	(2,344,000)
Recovery	342,000	673,000	522,000	885,000
Ending balance, June 30	(18,989,000)	(12,381,000)	(18,989,000)	(12,381,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	1,909,000	3,802,000	2,230,000	3,828,000
Provisions	2,318,000	2,595,000	2,009,000	2,570,000
Charge-offs	(1,085,000)	(4,076,000)	(1,097,000)	(4,077,000)
Recoveries	0	0	0	0
Ending balance, June 30	3,142,000	2,321,000	3,142,000	2,321,000
Total credit allowance	22,131,000	14,702,000	22,131,000	14,702,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	3,205,148,000		3,205,148,000		2,874,801,000
Total allowance for loan losses	(41,587,000)	(66,852,000)	(41,587,000)	(66,852,000)
Individually evaluated for impairment	62,018,000		62,018,000		68,317,000
Collectively evaluated for impairment	3,143,130,000		3,143,130,000		2,806,484,000
Individually evaluated for impairment	1,793,000		1,793,000		3,182,000
Collectively evaluated for impairment	39,794,000		39,794,000		44,912,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(45,135,000)	(80,614,000)	(48,094,000)	(91,722,000)
Provisions	(2,198,000)	(9,905,000)	(3,289,000)	(12,729,000)
Charge-offs	(2,636,000)	(9,481,000)	(5,559,000)	(20,999,000)
Recovery	1,286,000	5,624,000	2,341,000	8,858,000
Ending balance, June 30	(41,587,000)	(66,852,000)	(41,587,000)	(66,852,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	355,000	1,608,000	405,000	2,321,000
Provisions	152,000	(910,000)	102,000	(1,623,000)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, June 30	507,000	698,000	507,000	698,000
Total credit allowance	42,094,000	67,550,000	42,094,000	67,550,000
Commercial Real Estate [Member] | Investor CRE [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,172,433,000		1,172,433,000		1,219,847,000
Commercial Real Estate [Member] | Multifamily [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,962,919,000		1,962,919,000		1,580,289,000
Commercial Real Estate [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	69,796,000		69,796,000		74,665,000
Commercial [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	2,048,303,000		2,048,303,000		1,817,090,000
Total allowance for loan losses	(39,524,000)	(40,270,000)	(39,524,000)	(40,270,000)
Individually evaluated for impairment	43,336,000		43,336,000		48,312,000
Collectively evaluated for impairment	2,004,967,000		2,004,967,000		1,768,778,000
Individually evaluated for impairment	2,739,000		2,739,000		4,916,000
Collectively evaluated for impairment	36,785,000		36,785,000		36,958,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(39,596,000)	(34,483,000)	(41,874,000)	(38,046,000)
Provisions	1,819,000	6,222,000	209,000	10,680,000
Charge-offs	(2,512,000)	(3,606,000)	(4,100,000)	(13,139,000)
Recovery	621,000	3,171,000	1,541,000	4,683,000
Ending balance, June 30	(39,524,000)	(40,270,000)	(39,524,000)	(40,270,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	2,433,000	2,461,000	2,806,000	1,796,000
Provisions	119,000	889,000	(254,000)	1,554,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, June 30	2,552,000	3,350,000	2,552,000	3,350,000
Total credit allowance	42,076,000	43,620,000	42,076,000	43,620,000
Commercial [Member] | Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,411,576,000		1,411,576,000		1,276,591,000
Commercial [Member] | Commercial & Industrial (C&I) [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	636,727,000		636,727,000		540,499,000
Consumer [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	783,601,000		783,601,000		754,621,000
Total allowance for loan losses	(27,744,000)	(16,959,000)	(27,744,000)	(16,959,000)
Individually evaluated for impairment	0		0		494,000
Collectively evaluated for impairment	783,601,000		783,601,000		754,127,000
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	27,744,000		27,744,000		25,602,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(25,817,000)	(14,160,000)	(25,602,000)	(13,427,000)
Provisions	3,045,000	4,052,000	4,557,000	6,690,000
Charge-offs	(1,503,000)	(1,643,000)	(3,147,000)	(4,095,000)
Recovery	385,000	390,000	732,000	937,000
Ending balance, June 30	(27,744,000)	(16,959,000)	(27,744,000)	(16,959,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	2,722,000	1,282,000	2,118,000	1,787,000
Provisions	525,000	228,000	1,129,000	(277,000)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, June 30	3,247,000	1,510,000	3,247,000	1,510,000
Total credit allowance	30,991,000	18,469,000	30,991,000	18,469,000
Unallocated Financing Receivables [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	0		0		0
Total allowance for loan losses	(14,105,000)	(21,782,000)	(14,105,000)	(21,782,000)
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	0		0		0
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	14,105,000		14,105,000		18,928,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(19,157,000)	(19,774,000)	(18,928,000)	(19,066,000)
Provisions	(5,052,000)	2,008,000	(4,823,000)	2,716,000
Charge-offs	0	0	0	0
Recovery	0	0	0	0
Ending balance, June 30	(14,105,000)	(21,782,000)	(14,105,000)	(21,782,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	571,000	875,000	443,000	297,000
Provisions	(514,000)	(802,000)	(386,000)	(224,000)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, June 30	57,000	73,000	57,000	73,000
Total credit allowance	$ 14,162,000	$ 21,855,000	$ 14,162,000	$ 21,855,000