Loans Receivable And Allowance For Credit Losses (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	$ 7,154,243,000		$ 7,154,243,000		$ 6,253,234,000
Financing Receivable, Deferred Fees, Net	8,781,000		8,781,000		2,860,000
Total allowance for loan losses	(138,698,000)	(154,279,000)	(138,698,000)	(154,279,000)
Net loans receivable	7,024,326,000		7,024,326,000		6,101,749,000
Individually evaluated for impairment	94,467,000		94,467,000		126,257,000
Collectively evaluated for impairment	7,059,776,000		7,059,776,000		6,126,977,000
Individually evaluated for impairment	4,613,000		4,613,000		8,463,000
Collectively evaluated for impairment	134,085,000		134,085,000		145,882,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, July 1	141,949,000	158,244,000	154,345,000	177,458,000
Provisions	(2,100,000)	2,000,000	(4,700,000)	8,000,000
Charge-offs	(4,488,000)	(10,479,000)	(19,420,000)	(51,056,000)
Recovery	3,337,000	4,514,000	8,473,000	19,877,000
Ending balance, September 30	138,698,000	154,279,000	138,698,000	154,279,000
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, July 1	9,505,000	7,952,000	8,002,000	10,029,000
Provisions	2,100,000	0	4,700,000	2,000,000
Charge-offs	(1,064,000)	(181,000)	(2,161,000)	(4,258,000)
Recoveries	0	0	0	0
Ending balance, September 30	10,541,000	7,771,000	10,541,000	7,771,000
Total credit allowance	149,239,000	162,050,000	149,239,000	162,050,000
FHLB and Federal Reserve [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Loans Pledged as Collateral	4,930,000,000		4,930,000,000		4,150,000,000
Commercial Real Estate Other Receivable [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	2,085,672,000		2,085,672,000		1,817,090,000
Commercial Real Estate Construction Financing Receivable [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	3,208,226,000		3,208,226,000		2,874,801,000
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	1,052,381,000		1,052,381,000		806,722,000
Total allowance for loan losses	(17,276,000)	(10,748,000)	(17,276,000)	(10,748,000)
Individually evaluated for impairment	0		0		9,134,000
Collectively evaluated for impairment	1,052,381,000		1,052,381,000		797,588,000
Individually evaluated for impairment	0		0		365,000
Collectively evaluated for impairment	17,276,000		17,276,000		19,482,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, July 1	18,989,000	12,381,000	19,847,000	15,197,000
Provisions	(1,270,000)	(129,000)	(524,000)	(1,486,000)
Charge-offs	(752,000)	(1,641,000)	(2,878,000)	(3,985,000)
Recovery	309,000	137,000	831,000	1,022,000
Ending balance, September 30	17,276,000	10,748,000	17,276,000	10,748,000
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, July 1	3,142,000	2,321,000	2,230,000	3,828,000
Provisions	1,721,000	66,000	3,730,000	2,636,000
Charge-offs	(1,064,000)	(181,000)	(2,161,000)	(4,258,000)
Recoveries	0	0	0	0
Ending balance, September 30	3,799,000	2,206,000	3,799,000	2,206,000
Total credit allowance	21,075,000	12,954,000	21,075,000	12,954,000
Commercial Real Estate [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	3,208,226,000		3,208,226,000		2,874,801,000
Total allowance for loan losses	(41,113,000)	(57,178,000)	(41,113,000)	(57,178,000)
Individually evaluated for impairment	55,583,000		55,583,000		68,317,000
Collectively evaluated for impairment	3,152,643,000		3,152,643,000		2,806,484,000
Individually evaluated for impairment	1,444,000		1,444,000		3,182,000
Collectively evaluated for impairment	39,669,000		39,669,000		44,912,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, July 1	41,587,000	66,852,000	48,094,000	91,722,000
Provisions	(659,000)	(8,349,000)	(3,948,000)	(21,078,000)
Charge-offs	(1,219,000)	(4,898,000)	(6,778,000)	(25,897,000)
Recovery	1,404,000	3,573,000	3,745,000	12,431,000
Ending balance, September 30	41,113,000	57,178,000	41,113,000	57,178,000
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, July 1	507,000	698,000	405,000	2,321,000
Provisions	237,000	(427,000)	339,000	(2,050,000)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, September 30	744,000	271,000	744,000	271,000
Total credit allowance	41,857,000	57,449,000	41,857,000	57,449,000
Commercial [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	2,085,672,000		2,085,672,000		1,817,090,000
Total allowance for loan losses	(42,611,000)	(41,515,000)	(42,611,000)	(41,515,000)
Individually evaluated for impairment	38,884,000		38,884,000		48,312,000
Collectively evaluated for impairment	2,046,788,000		2,046,788,000		1,768,778,000
Individually evaluated for impairment	3,169,000		3,169,000		4,916,000
Collectively evaluated for impairment	39,442,000		39,442,000		36,958,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, July 1	39,524,000	40,270,000	41,874,000	38,046,000
Provisions	2,820,000	2,762,000	3,029,000	13,442,000
Charge-offs	(1,051,000)	(2,058,000)	(5,151,000)	(15,197,000)
Recovery	1,318,000	541,000	2,859,000	5,224,000
Ending balance, September 30	42,611,000	41,515,000	42,611,000	41,515,000
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, July 1	2,552,000	3,350,000	2,806,000	1,796,000
Provisions	342,000	(1,000)	88,000	1,553,000
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, September 30	2,894,000	3,349,000	2,894,000	3,349,000
Total credit allowance	45,505,000	44,864,000	45,505,000	44,864,000
Consumer [Member]
Financing Receivable, Allowance for Credit Loss, Additional Information [Abstract]
Total loans receivable, gross	807,964,000		807,964,000		754,621,000
Total allowance for loan losses	(25,220,000)	(19,992,000)	(25,220,000)	(19,992,000)
Individually evaluated for impairment	0		0		494,000
Collectively evaluated for impairment	807,964,000		807,964,000		754,127,000
Individually evaluated for impairment	0		0		0
Collectively evaluated for impairment	25,220,000		25,220,000		25,602,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, July 1	27,744,000	16,959,000	25,602,000	13,427,000
Provisions	(1,364,000)	4,652,000	3,193,000	11,342,000
Charge-offs	(1,466,000)	(1,882,000)	(4,613,000)	(5,977,000)
Recovery	306,000	263,000	1,038,000	1,200,000
Ending balance, September 30	25,220,000	19,992,000	25,220,000	19,992,000
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, July 1	3,247,000	1,510,000	2,118,000	1,787,000
Provisions	(206,000)	165,000	923,000	(112,000)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, September 30	3,041,000	1,675,000	3,041,000	1,675,000
Total credit allowance	28,261,000	21,667,000	28,261,000	21,667,000
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	(12,478,000)	(24,846,000)	(12,478,000)	(24,846,000)
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	12,478,000		12,478,000		18,928,000
Financing Receivable, Allowance for Credit Losses [Roll Forward]
Beginning balance, July 1	14,105,000	21,782,000	18,928,000	19,066,000
Provisions	(1,627,000)	3,064,000	(6,450,000)	5,780,000
Charge-offs	0	0	0	0
Recovery	0	0	0	0
Ending balance, September 30	12,478,000	24,846,000	12,478,000	24,846,000
Financing Receivable, Unfunded Credit Commitments [Roll Forward]
Beginning balance, July 1	57,000	73,000	443,000	297,000
Provisions	6,000	197,000	(380,000)	(27,000)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Ending balance, September 30	63,000	270,000	63,000	270,000
Total credit allowance	$ 12,541,000	$ 25,116,000	$ 12,541,000	$ 25,116,000