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Loans Receivable and Allowance for Credit Losses (Credit Risk Ratings for Non-PCI Loans by Portfolio Segment) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | $ 28,975,718 | $ 25,503,139
Commercial Lending |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 22,210,001 | 19,917,365
Commercial Lending | C&I |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 10,697,231 | 9,640,563
Commercial Lending | CRE |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 8,936,897 | 8,016,109
Commercial Lending | Residential loan | Multifamily |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 1,916,176 | 1,585,939
Commercial Lending | Construction and land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 659,697 | 674,754
Consumer Lending |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 6,765,717 | 5,585,774
Consumer Lending | Residential loan | Single-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 4,646,289 | 3,509,779
Consumer Lending | HELOCs |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 1,782,924 | 1,760,776
Consumer Lending | Other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 336,504 | 315,219
Non-PCI impaired loans |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 28,493,431 | 24,860,694
Non-PCI impaired loans | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 27,878,020 | 24,177,983
Non-PCI impaired loans | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 213,490 | 212,927
Non-PCI impaired loans | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 381,039 | 464,609
Non-PCI impaired loans | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 20,882 | 5,167
Non-PCI impaired loans | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 8
Non-PCI impaired loans | Commercial Lending |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 21,859,099 | 19,432,958
Non-PCI impaired loans | Commercial Lending | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 21,308,550 | 18,793,563
Non-PCI impaired loans | Commercial Lending | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 184,975 | 195,984
Non-PCI impaired loans | Commercial Lending | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 344,692 | 438,236
Non-PCI impaired loans | Commercial Lending | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 20,882 | 5,167
Non-PCI impaired loans | Commercial Lending | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 8
Non-PCI impaired loans | Commercial Lending | C&I |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 10,685,436 | 9,602,176
Non-PCI impaired loans | Commercial Lending | C&I | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 10,369,516 | 9,194,701
Non-PCI impaired loans | Commercial Lending | C&I | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 114,769 | 164,711
Non-PCI impaired loans | Commercial Lending | C&I | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 180,269 | 237,599
Non-PCI impaired loans | Commercial Lending | C&I | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 20,882 | 5,157
Non-PCI impaired loans | Commercial Lending | C&I | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 8
Non-PCI impaired loans | Commercial Lending | CRE |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 8,659,209 | 7,667,661
Non-PCI impaired loans | Commercial Lending | CRE | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 8,484,635 | 7,476,804
Non-PCI impaired loans | Commercial Lending | CRE | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 65,616 | 29,005
Non-PCI impaired loans | Commercial Lending | CRE | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 108,958 | 161,852
Non-PCI impaired loans | Commercial Lending | CRE | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Commercial Lending | CRE | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Commercial Lending | Residential loan | Multifamily |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 1,855,128 | 1,490,285
Non-PCI impaired loans | Commercial Lending | Residential loan | Multifamily | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 1,839,958 | 1,462,522
Non-PCI impaired loans | Commercial Lending | Residential loan | Multifamily | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 2,268
Non-PCI impaired loans | Commercial Lending | Residential loan | Multifamily | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 15,170 | 25,495
Non-PCI impaired loans | Commercial Lending | Residential loan | Multifamily | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Commercial Lending | Residential loan | Multifamily | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Commercial Lending | Construction and land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 659,326 | 672,836
Non-PCI impaired loans | Commercial Lending | Construction and land | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 614,441 | 659,536
Non-PCI impaired loans | Commercial Lending | Construction and land | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 4,590 | 0
Non-PCI impaired loans | Commercial Lending | Construction and land | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 40,295 | 13,290
Non-PCI impaired loans | Commercial Lending | Construction and land | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 10
Non-PCI impaired loans | Commercial Lending | Construction and land | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Consumer Lending |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 6,634,332 | 5,427,736
Non-PCI impaired loans | Consumer Lending | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 6,569,470 | 5,384,420
Non-PCI impaired loans | Consumer Lending | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 28,515 | 16,943
Non-PCI impaired loans | Consumer Lending | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 36,347 | 26,373
Non-PCI impaired loans | Consumer Lending | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Consumer Lending | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 4,528,911 | 3,370,669
Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 4,490,672 | 3,341,015
Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 16,504 | 10,179
Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 21,735 | 19,475
Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Consumer Lending | Residential loan | Single-family | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Consumer Lending | HELOCs |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 1,768,917 | 1,741,852
Non-PCI impaired loans | Consumer Lending | HELOCs | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 1,744,903 | 1,728,254
Non-PCI impaired loans | Consumer Lending | HELOCs | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 11,900 | 6,717
Non-PCI impaired loans | Consumer Lending | HELOCs | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 12,114 | 6,881
Non-PCI impaired loans | Consumer Lending | HELOCs | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Consumer Lending | HELOCs | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Consumer Lending | Other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 336,504 | 315,215
Non-PCI impaired loans | Consumer Lending | Other consumer | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 333,895 | 315,151
Non-PCI impaired loans | Consumer Lending | Other consumer | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 111 | 47
Non-PCI impaired loans | Consumer Lending | Other consumer | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 2,498 | 17
Non-PCI impaired loans | Consumer Lending | Other consumer | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
Non-PCI impaired loans | Consumer Lending | Other 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 | 482,287 | 642,445
PCI Loans | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 432,628 | 568,844
PCI Loans | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 2,131 | 5,566
PCI Loans | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 47,528 | 68,035
PCI Loans | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 350,902 | 484,407
PCI Loans | Commercial Lending | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 306,081 | 415,166
PCI Loans | Commercial Lending | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 588 | 4,011
PCI Loans | Commercial Lending | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 44,233 | 65,230
PCI Loans | Commercial Lending | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending | C&I |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 11,795 | 38,387
PCI Loans | Commercial Lending | C&I | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 10,712 | 33,885
PCI Loans | Commercial Lending | C&I | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 57 | 772
PCI Loans | Commercial Lending | C&I | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 1,026 | 3,730
PCI Loans | Commercial Lending | C&I | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending | C&I | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending | CRE |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 277,688 | 348,448
PCI Loans | Commercial Lending | CRE | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 238,605 | 293,529
PCI Loans | Commercial Lending | CRE | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 531 | 3,239
PCI Loans | Commercial Lending | CRE | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 38,552 | 51,680
PCI Loans | Commercial Lending | CRE | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending | CRE | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending | Residential loan | Multifamily |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 61,048 | 95,654
PCI Loans | Commercial Lending | Residential loan | Multifamily | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 56,720 | 86,190
PCI Loans | Commercial Lending | Residential loan | Multifamily | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending | Residential loan | Multifamily | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 4,328 | 9,464
PCI Loans | Commercial Lending | Residential loan | Multifamily | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending | Residential loan | Multifamily | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending | Construction and land |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 371 | 1,918
PCI Loans | Commercial Lending | Construction and land | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 44 | 1,562
PCI Loans | Commercial Lending | Construction and land | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending | Construction and land | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 327 | 356
PCI Loans | Commercial Lending | Construction and land | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Commercial Lending | Construction and land | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Consumer Lending |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 131,385 | 158,038
PCI Loans | Consumer Lending | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 126,547 | 153,678
PCI Loans | Consumer Lending | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 1,543 | 1,555
PCI Loans | Consumer Lending | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 3,295 | 2,805
PCI Loans | Consumer Lending | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Consumer Lending | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Consumer Lending | Residential loan | Single-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 117,378 | 139,110
PCI Loans | Consumer Lending | Residential loan | Single-family | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 113,905 | 136,245
PCI Loans | Consumer Lending | Residential loan | Single-family | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 1,543 | 1,239
PCI Loans | Consumer Lending | Residential loan | Single-family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 1,930 | 1,626
PCI Loans | Consumer Lending | Residential loan | Single-family | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Consumer Lending | Residential loan | Single-family | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Consumer Lending | HELOCs |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 14,007 | 18,924
PCI Loans | Consumer Lending | HELOCs | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 12,642 | 17,429
PCI Loans | Consumer Lending | HELOCs | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 316
PCI Loans | Consumer Lending | HELOCs | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 1,365 | 1,179
PCI Loans | Consumer Lending | HELOCs | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Consumer Lending | HELOCs | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Consumer Lending | Other consumer |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 4
PCI Loans | Consumer Lending | Other consumer | Pass/Watch |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 4
PCI Loans | Consumer Lending | Other consumer | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Consumer Lending | Other consumer | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Consumer Lending | Other consumer | Doubtful |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | 0 | 0
PCI Loans | Consumer Lending | Other consumer | Loss |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Total loans held-for-investment | $ 0 | $ 0

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