Loans Receivable and Allowance For Credit Losses - Internally Assigned Risk Rating and Performance Status (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	$ 7,457,819,000	$ 6,253,234,000
% of Total	100.00%	100.00%
Carrying amount	16,700,000	11,200,000
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	5,814,446,000	4,564,064,000
% of Total	78.00%	73.00%
Marginal
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,367,030,000	1,261,577,000
% of Total	18.00%	20.00%
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	148,223,000	231,570,000
% of Total	2.00%	4.00%
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	122,283,000	187,560,000
% of Total	2.00%	3.00%
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	5,837,000	8,463,000
% of Total	0.00%	0.00%
Restructured Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	47,774,000	64,216,000
% of Total	1.00%	1.00%
Nonaccrual Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	69,302,000	121,113,000
% of Total	1.00%	2.00%
Carrying amount	5,700,000	2,100,000
Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	117,076,000	185,329,000
% of Total	2.00%	3.00%
Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	7,340,743,000	6,067,905,000
% of Total	98.00%	97.00%
Residential real estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,119,574,000	806,722,000
Residential real estate [Member] | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,038,460,000	714,346,000
Residential real estate [Member] | Marginal
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	52,154,000	53,722,000
Residential real estate [Member] | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	7,808,000	11,739,000
Residential real estate [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	18,184,000	26,550,000
Residential real estate [Member] | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	2,968,000	365,000
Residential real estate [Member] | Restructured Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	22,337,000	22,968,000
Residential real estate [Member] | Nonaccrual Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	15,571,000	20,457,000
Residential real estate [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	37,908,000	43,425,000
Residential real estate [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,081,666,000	763,297,000
Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	3,342,895,000	2,874,801,000
Investor CRE [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,114,768,000	1,219,847,000
Investor CRE [Member] | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	602,384,000	599,660,000
Investor CRE [Member] | Marginal
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	435,022,000	472,801,000
Investor CRE [Member] | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	44,934,000	77,342,000
Investor CRE [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	31,613,000	67,347,000
Investor CRE [Member] | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	815,000	2,697,000
Investor CRE [Member] | Restructured Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	3,005,000	4,334,000
Investor CRE [Member] | Nonaccrual Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	23,709,000	46,399,000
Investor CRE [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	26,714,000	50,733,000
Investor CRE [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,088,054,000	1,169,114,000
Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	2,156,434,000	1,580,289,000
Multifamily [Member] | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	2,058,031,000	1,486,824,000
Multifamily [Member] | Marginal
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	87,830,000	74,379,000
Multifamily [Member] | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	9,296,000	10,122,000
Multifamily [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,140,000	8,745,000
Multifamily [Member] | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	137,000	219,000
Multifamily [Member] | Restructured Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	0	4,094,000
Multifamily [Member] | Nonaccrual Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	222,000	4,055,000
Multifamily [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	222,000	8,149,000
Multifamily [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	2,156,212,000	1,572,140,000
Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	71,693,000	74,665,000
Construction [Member] | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	14,591,000	10,946,000
Construction [Member] | Marginal
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	53,742,000	42,518,000
Construction [Member] | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,128,000	3,401,000
Construction [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	2,232,000	17,534,000
Construction [Member] | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	0	266,000
Construction [Member] | Restructured Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	2,084,000	8,551,000
Construction [Member] | Nonaccrual Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,582,000	8,144,000
Construction [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	3,666,000	16,695,000
Construction [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	68,027,000	57,970,000
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	2,173,282,000	1,817,090,000
Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,431,140,000	1,276,591,000
Owner Occupied CRE [Member] | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	785,237,000	678,916,000
Owner Occupied CRE [Member] | Marginal
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	544,329,000	454,348,000
Owner Occupied CRE [Member] | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	61,103,000	85,228,000
Owner Occupied CRE [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	38,709,000	53,183,000
Owner Occupied CRE [Member] | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,762,000	4,916,000
Owner Occupied CRE [Member] | Restructured Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	19,553,000	23,152,000
Owner Occupied CRE [Member] | Nonaccrual Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	20,472,000	31,696,000
Owner Occupied CRE [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	40,025,000	54,848,000
Owner Occupied CRE [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	1,391,115,000	1,221,743,000
Commercial & Industrial [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	742,142,000	540,499,000
Commercial & Industrial [Member] | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	521,711,000	349,674,000
Commercial & Industrial [Member] | Marginal
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	177,998,000	146,554,000
Commercial & Industrial [Member] | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	17,761,000	38,874,000
Commercial & Industrial [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	24,672,000	5,397,000
Commercial & Industrial [Member] | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	0	0
Commercial & Industrial [Member] | Restructured Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	774,000	810,000
Commercial & Industrial [Member] | Nonaccrual Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	3,230,000	3,424,000
Commercial & Industrial [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	4,004,000	4,234,000
Commercial & Industrial [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	738,138,000	536,265,000
Consumer [Member]
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	822,068,000	754,621,000
Consumer [Member] | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	794,032,000	723,698,000
Consumer [Member] | Marginal
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	15,955,000	17,255,000
Consumer [Member] | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	6,193,000	4,864,000
Consumer [Member] | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	5,733,000	8,804,000
Consumer [Member] | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	155,000	0
Consumer [Member] | Restructured Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	21,000	307,000
Consumer [Member] | Nonaccrual Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	4,516,000	6,938,000
Consumer [Member] | Nonperforming Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	4,537,000	7,245,000
Consumer [Member] | Performing Financing Receivable
Financing Receivable, Recorded Investment [Line Items]
Total loans receivable, gross	$ 817,531,000	$ 747,376,000