Loans Receivable And Allowance For Credit Losses (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	$ 6,142,327,000		$ 6,142,327,000		$ 5,518,889,000
Financing Receivable, Deferred Fees, Net	2,317,000		2,317,000		(252,000)
Total allowance for loan losses	(154,279,000)	(186,195,000)	(154,279,000)	(186,195,000)
Net loans receivable	5,990,365,000		5,990,365,000		5,341,179,000
Unamortized portion of discounts on acquired loans	23,400,000		23,400,000		4,300,000
Individually evaluated for impairment	152,445,000		152,445,000		243,112,000
Collectively evaluated for impairment	5,989,882,000		5,989,882,000		5,275,777,000
Individually evaluated for impairment	10,104,000		10,104,000		16,305,000
Collectively evaluated for impairment	144,175,000		144,175,000		161,153,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(158,244,000)	(212,088,000)	(177,458,000)	(247,056,000)
Provisions	2,000,000	4,000,000	8,000,000	26,500,000
Charge-offs	(10,479,000)	(41,177,000)	(51,056,000)	(109,903,000)
Recovery	4,514,000	11,284,000	19,877,000	22,542,000
Ending balance, June 30	(154,279,000)	(186,195,000)	(154,279,000)	(186,195,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	7,952,000	7,431,000	10,029,000	10,707,000
Provisions	0	2,000,000	2,000,000	(500,000)
Charge-offs	(181,000)	(55,000)	(4,258,000)	(831,000)
Recoveries	0	0	0	0
Ending balance, June 30	7,771,000	9,376,000	7,771,000	9,376,000
Total credit allowance	162,050,000	195,571,000	162,050,000	195,571,000
FHLB and Federal Reserve [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans Pledged as Collateral	3,610,000,000		3,610,000,000		4,020,000,000
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	818,323,000		818,323,000		688,020,000
Total allowance for loan losses	(10,748,000)	(20,050,000)	(10,748,000)	(20,050,000)
Individually evaluated for impairment	8,565,000		8,565,000		18,301,000
Collectively evaluated for impairment	809,758,000		809,758,000		669,719,000
Individually evaluated for impairment	365,000		365,000		872,000
Collectively evaluated for impairment	10,383,000		10,383,000		14,325,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(12,381,000)	(20,826,000)	(15,197,000)	(17,307,000)
Provisions	(129,000)	3,250,000	(1,486,000)	16,941,000
Charge-offs	(1,641,000)	(4,204,000)	(3,985,000)	(15,230,000)
Recovery	137,000	178,000	1,022,000	1,032,000
Ending balance, June 30	(10,748,000)	(20,050,000)	(10,748,000)	(20,050,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	2,321,000	2,435,000	3,828,000	3,189,000
Provisions	66,000	624,000	2,636,000	646,000
Charge-offs	(181,000)	(55,000)	(4,258,000)	(831,000)
Recoveries	0	0	0	0
Ending balance, June 30	2,206,000	3,004,000	2,206,000	3,004,000
Total credit allowance	12,954,000	23,054,000	12,954,000	23,054,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	2,733,833,000		2,733,833,000		2,451,754,000
Total allowance for loan losses	(57,178,000)	(87,561,000)	(57,178,000)	(87,561,000)
Individually evaluated for impairment	82,543,000		82,543,000		149,578,000
Collectively evaluated for impairment	2,651,290,000		2,651,290,000		2,302,176,000
Individually evaluated for impairment	3,660,000		3,660,000		11,170,000
Collectively evaluated for impairment	53,518,000		53,518,000		80,552,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(66,852,000)	(102,607,000)	(91,722,000)	(124,907,000)
Provisions	(8,349,000)	4,823,000	(21,078,000)	14,280,000
Charge-offs	(4,898,000)	(26,650,000)	(25,897,000)	(66,595,000)
Recovery	3,573,000	6,781,000	12,431,000	14,969,000
Ending balance, June 30	(57,178,000)	(87,561,000)	(57,178,000)	(87,561,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	698,000	2,555,000	2,321,000	4,157,000
Provisions	(427,000)	(387,000)	(2,050,000)	(1,989,000)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, June 30	271,000	2,168,000	271,000	2,168,000
Total credit allowance	57,449,000	89,729,000	57,449,000	89,729,000
Commercial Real Estate [Member] | Investor CRE [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,274,774,000		1,274,774,000		1,275,667,000
Commercial Real Estate [Member] | Multifamily [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,359,506,000		1,359,506,000		1,001,479,000
Commercial Real Estate [Member] | Construction [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	99,553,000		99,553,000		174,608,000
Commercial [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,821,812,000		1,821,812,000		1,704,154,000
Total allowance for loan losses	(41,515,000)	(38,170,000)	(41,515,000)	(38,170,000)
Individually evaluated for impairment	60,510,000		60,510,000		74,041,000
Collectively evaluated for impairment	1,761,302,000		1,761,302,000		1,630,113,000
Individually evaluated for impairment	6,036,000		6,036,000		4,206,000
Collectively evaluated for impairment	35,479,000		35,479,000		33,840,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(40,270,000)	(46,602,000)	(38,046,000)	(56,951,000)
Provisions	2,762,000	(4,525,000)	13,442,000	(2,640,000)
Charge-offs	(2,058,000)	(7,769,000)	(15,197,000)	(21,261,000)
Recovery	541,000	3,862,000	5,224,000	5,120,000
Ending balance, June 30	(41,515,000)	(38,170,000)	(41,515,000)	(38,170,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	3,350,000	924,000	1,796,000	1,515,000
Provisions	(1,000)	613,000	1,553,000	22,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, June 30	3,349,000	1,537,000	3,349,000	1,537,000
Total credit allowance	44,864,000	39,707,000	44,864,000	39,707,000
Commercial [Member] | Owner Occupied CRE [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,304,224,000		1,304,224,000		1,272,461,000
Commercial [Member] | Commercial & Industrial (C&I) [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	517,588,000		517,588,000		431,693,000
Consumer [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	768,359,000		768,359,000		674,961,000
Total allowance for loan losses	(19,992,000)	(12,611,000)	(19,992,000)	(12,611,000)
Individually evaluated for impairment	827,000		827,000		1,192,000
Collectively evaluated for impairment	767,532,000		767,532,000		673,769,000
Individually evaluated for impairment	43,000		43,000		57,000
Collectively evaluated for impairment	19,949,000		19,949,000		13,370,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(16,959,000)	(13,800,000)	(13,427,000)	(14,645,000)
Provisions	4,652,000	902,000	11,342,000	3,362,000
Charge-offs	(1,882,000)	(2,554,000)	(5,977,000)	(6,817,000)
Recovery	263,000	463,000	1,200,000	1,421,000
Ending balance, June 30	(19,992,000)	(12,611,000)	(19,992,000)	(12,611,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	1,510,000	2,108,000	1,787,000	817,000
Provisions	165,000	(383,000)	(112,000)	908,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, June 30	1,675,000	1,725,000	1,675,000	1,725,000
Total credit allowance	21,667,000	14,336,000	21,667,000	14,336,000
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	(24,846,000)	(27,803,000)	(24,846,000)	(27,803,000)
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	24,846,000		24,846,000		19,066,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, April 1	(21,782,000)	(28,253,000)	(19,066,000)	(33,246,000)
Provisions	3,064,000	(450,000)	5,780,000	(5,443,000)
Charge-offs	0	0	0	0
Recovery	0	0	0	0
Ending balance, June 30	(24,846,000)	(27,803,000)	(24,846,000)	(27,803,000)
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, April 1	73,000	(591,000)	297,000	1,029,000
Provisions	197,000	1,533,000	(27,000)	(87,000)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, June 30	270,000	942,000	270,000	942,000
Total credit allowance	$ 25,116,000	$ 28,745,000	$ 25,116,000	$ 28,745,000