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Loans Receivable and Allowance for Credit Losses (Details 3) - Loans Receivable - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	$ 26,461,292	$ 25,503,139
CRE
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	8,986,890	8,690,863
CRE | Income producing
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	8,302,098	8,016,109
CRE | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	562,560	551,560
CRE | Land
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	122,232	123,194
C&I
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	9,918,072	9,640,563
C&I | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	9,208,857	8,959,633
C&I | Trade finance
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	709,215	680,930
Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	5,432,767	5,095,718
Residential | Real estate loan | Single-family
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,700,072	3,509,779
Residential | Real estate loan | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,732,695	1,585,939
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	2,123,563	2,075,995
Non-PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	25,849,628	24,860,694
Non-PCI Loans | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	25,184,475	24,177,983
Non-PCI Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	215,345	212,927
Non-PCI Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	424,879	464,609
Non-PCI Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	24,929	5,167
Non-PCI Loans | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	8
Non-PCI Loans | CRE
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	8,647,669	8,340,497
Non-PCI Loans | CRE | Income producing
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	7,964,224	7,667,661
Non-PCI Loans | CRE | Income producing | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	7,800,487	7,476,804
Non-PCI Loans | CRE | Income producing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	23,362	29,005
Non-PCI Loans | CRE | Income producing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	140,375	161,852
Non-PCI Loans | CRE | Income producing | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Income producing | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	562,560	551,560
Non-PCI Loans | CRE | Construction | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	530,278	551,560
Non-PCI Loans | CRE | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	32,282	0
Non-PCI Loans | CRE | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Land
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	120,885	121,276
Non-PCI Loans | CRE | Land | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	109,013	107,976
Non-PCI Loans | CRE | Land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Land | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	11,872	13,290
Non-PCI Loans | CRE | Land | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	10
Non-PCI Loans | CRE | Land | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | C&I
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	9,885,962	9,602,176
Non-PCI Loans | C&I | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	9,176,747	8,921,246
Non-PCI Loans | C&I | Commercial business | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	8,827,318	8,559,674
Non-PCI Loans | C&I | Commercial business | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	139,251	155,276
Non-PCI Loans | C&I | Commercial business | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	185,249	201,139
Non-PCI Loans | C&I | Commercial business | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	24,929	5,157
Non-PCI Loans | C&I | Commercial business | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | C&I | Trade finance
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	709,215	680,930
Non-PCI Loans | C&I | Trade finance | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	677,654	635,027
Non-PCI Loans | C&I | Trade finance | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,566	9,435
Non-PCI Loans | C&I | Trade finance | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	27,995	36,460
Non-PCI Loans | C&I | Trade finance | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | C&I | Trade finance | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	8
Non-PCI Loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	5,209,906	4,860,954
Non-PCI Loans | Residential | Real estate loan | Single-family
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,566,739	3,370,669
Non-PCI Loans | Residential | Real estate loan | Single-family | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,533,047	3,341,015
Non-PCI Loans | Residential | Real estate loan | Single-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	8,693	10,179
Non-PCI Loans | Residential | Real estate loan | Single-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	24,999	19,475
Non-PCI Loans | Residential | Real estate loan | Single-family | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | Residential | Real estate loan | Single-family | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | Residential | Real estate loan | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,643,167	1,490,285
Non-PCI Loans | Residential | Real estate loan | Multifamily | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,619,193	1,462,522
Non-PCI Loans | Residential | Real estate loan | Multifamily | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,284	2,268
Non-PCI Loans | Residential | Real estate loan | Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	22,690	25,495
Non-PCI Loans | Residential | Real estate loan | Multifamily | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | Residential | Real estate loan | Multifamily | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	2,106,091	2,057,067
Non-PCI Loans | Consumer | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	2,087,485	2,043,405
Non-PCI Loans | Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	6,907	6,764
Non-PCI Loans | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	11,699	6,898
Non-PCI Loans | Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | Consumer | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	611,664	642,445
PCI Loans | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	537,095	568,844
PCI Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,149	5,566
PCI Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	71,420	68,035
PCI Loans | CRE
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	339,221	350,366
PCI Loans | CRE | Income producing
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	337,874	348,448
PCI Loans | CRE | Income producing | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	282,099	293,529
PCI Loans | CRE | Income producing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	573	3,239
PCI Loans | CRE | Income producing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	55,202	51,680
PCI Loans | CRE | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
PCI Loans | CRE | Land
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,347	1,918
PCI Loans | CRE | Land | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,012	1,562
PCI Loans | CRE | Land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
PCI Loans | CRE | Land | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	335	356
PCI Loans | C&I
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	32,110	38,387
PCI Loans | C&I | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	32,110	38,387
PCI Loans | C&I | Commercial business | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	27,884	33,885
PCI Loans | C&I | Commercial business | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	680	772
PCI Loans | C&I | Commercial business | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,546	3,730
PCI Loans | C&I | Trade finance
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
PCI Loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	222,861	234,764
PCI Loans | Residential | Real estate loan | Single-family
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	133,333	139,110
PCI Loans | Residential | Real estate loan | Single-family | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	130,031	136,245
PCI Loans | Residential | Real estate loan | Single-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,522	1,239
PCI Loans | Residential | Real estate loan | Single-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,780	1,626
PCI Loans | Residential | Real estate loan | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	89,528	95,654
PCI Loans | Residential | Real estate loan | Multifamily | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	80,510	86,190
PCI Loans | Residential | Real estate loan | Multifamily | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
PCI Loans | Residential | Real estate loan | Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	9,018	9,464
PCI Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	17,472	18,928
PCI Loans | Consumer | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	15,559	17,433
PCI Loans | Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	374	316
PCI Loans | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	$ 1,539	$ 1,179

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(3))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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