Loans Receivable and Allowance For Credit Losses - Aging by Class (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 days past due	$ 16,964	$ 34,944
60 to 89 days past due	7,204	8,569
90 days or more past due	47,645	93,936
Total past due	71,813	137,449
Current	7,386,006	6,115,785
Loans receivable	7,457,819	6,253,234
Past due 90 days or more and accruing	0	0
% of total, 30 to 59 days past due	0.00%	1.00%
% of total, 60 to 89 days past due	0.00%	0.00%
% of total, 90 days or more past due	1.00%	2.00%
% of total, total past due	1.00%	3.00%
% of total, current	99.00%	97.00%
Total loans, percentage	100.00%	100.00%
% of total, past due 90 days or more and accruing	0.00%	0.00%
Residential real estate [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 days past due	2,544	5,800
60 to 89 days past due	1,258	1,576
90 days or more past due	15,175	20,507
Total past due	18,977	27,883
Current	1,100,597	778,839
Loans receivable	1,119,574	806,722
Past due 90 days or more and accruing	0	0
Commercial real estate
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	3,342,895	2,874,801
Investor CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 days past due	1,575	10,565
60 to 89 days past due	1,230	1,042
90 days or more past due	12,553	34,196
Total past due	15,358	45,803
Current	1,099,410	1,174,044
Loans receivable	1,114,768	1,219,847
Past due 90 days or more and accruing	0	0
Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 days past due	378	707
60 to 89 days past due	0	479
90 days or more past due	222	3,436
Total past due	600	4,622
Current	2,155,834	1,575,667
Loans receivable	2,156,434	1,580,289
Past due 90 days or more and accruing	0	0
Construction [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 days past due	0	611
60 to 89 days past due	0	0
90 days or more past due	1,582	8,243
Total past due	1,582	8,854
Current	70,111	65,811
Loans receivable	71,693	74,665
Past due 90 days or more and accruing	0	0
Commercial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
Loans receivable	2,173,282	1,817,090
Owner Occupied CRE [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 days past due	6,069	10,543
60 to 89 days past due	1,350	3,300
90 days or more past due	12,086	20,883
Total past due	19,505	34,726
Current	1,411,635	1,241,865
Loans receivable	1,431,140	1,276,591
Past due 90 days or more and accruing	0	0
Commercial & Industrial [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 days past due	1,066	2,690
60 to 89 days past due	1,893	376
90 days or more past due	1,997	1,954
Total past due	4,956	5,020
Current	737,186	535,479
Loans receivable	742,142	540,499
Past due 90 days or more and accruing	0	0
Consumer [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30 to 59 days past due	5,332	4,028
60 to 89 days past due	1,473	1,796
90 days or more past due	4,030	4,717
Total past due	10,835	10,541
Current	811,233	744,080
Loans receivable	822,068	754,621
Past due 90 days or more and accruing	$ 0	$ 0