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Loans Receivable and Allowance for Credit Losses (Non-PCI TDR Modifications) (Details) - Non-PCI impaired loans - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | $ 43,651 | $ 65,762 | $ 36,254
Principal |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 19,164 | 57,729 | 17,191
Principal and Interest |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 8,003 | 0 | 18,588
Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 6,722 | 0
Interest Deferments |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 237 | 0
Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 16,484 | 1,074 | 475
Commercial Lending |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 43,496 | 64,112 | 35,975
Commercial Lending | Principal |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 19,164 | 57,132 | 16,912
Commercial Lending | Principal and Interest |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 7,848 | 0 | 18,588
Commercial Lending | Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 5,876 | 0
Commercial Lending | Interest Deferments |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 30 | 0
Commercial Lending | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 16,484 | 1,074 | 475
Commercial Lending | C&I |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 37,900 | 40,405 | 34,165
Commercial Lending | C&I | Principal |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 13,568 | 34,499 | 16,364
Commercial Lending | C&I | Principal and Interest |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 7,848 | 0 | 17,801
Commercial Lending | C&I | Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 5,876 | 0
Commercial Lending | C&I | Interest Deferments |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 30 | 0
Commercial Lending | C&I | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 16,484 | 0 | 0
Commercial Lending | CRE |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 2,627 | 18,824 | 1,727
Commercial Lending | CRE | Principal |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 2,627 | 17,750 | 548
Commercial Lending | CRE | Principal and Interest |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 787
Commercial Lending | CRE | Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0
Commercial Lending | CRE | Interest Deferments |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0
Commercial Lending | CRE | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 1,074 | 392
Commercial Lending | Residential loan | Multifamily |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 2,969 |  |
Commercial Lending | Residential loan | Multifamily | Principal |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 2,969 |  |
Commercial Lending | Residential loan | Multifamily | Principal and Interest |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 |  |
Commercial Lending | Residential loan | Multifamily | Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 |  |
Commercial Lending | Residential loan | Multifamily | Interest Deferments |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 |  |
Commercial Lending | Residential loan | Multifamily | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 |  |
Commercial Lending | Construction and land |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 4,883 | 83
Commercial Lending | Construction and land | Principal |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 4,883 | 0
Commercial Lending | Construction and land | Principal and Interest |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 0 | 0
Commercial Lending | Construction and land | Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 0 | 0
Commercial Lending | Construction and land | Interest Deferments |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 0 | 0
Commercial Lending | Construction and land | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 0 | 83
Consumer Lending |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 155 | 1,650 | 279
Consumer Lending | Principal |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 597 | 279
Consumer Lending | Principal and Interest |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 155 | 0 | 0
Consumer Lending | Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 846 | 0
Consumer Lending | Interest Deferments |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 207 | 0
Consumer Lending | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 | 0
Consumer Lending | Residential loan | Single-family |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 1,268 | 279
Consumer Lending | Residential loan | Single-family | Principal |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 264 | 279
Consumer Lending | Residential loan | Single-family | Principal and Interest |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 0 | 0
Consumer Lending | Residential loan | Single-family | Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 797 | 0
Consumer Lending | Residential loan | Single-family | Interest Deferments |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 207 | 0
Consumer Lending | Residential loan | Single-family | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment |  | 0 | $ 0
Consumer Lending | HELOCs |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 155 | 382 |
Consumer Lending | HELOCs | Principal |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 333 |
Consumer Lending | HELOCs | Principal and Interest |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 155 | 0 |
Consumer Lending | HELOCs | Interest Rate Reduction |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 49 |
Consumer Lending | HELOCs | Interest Deferments |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | 0 | 0 |
Consumer Lending | HELOCs | Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Post-Modification Outstanding Recorded Investment | $ 0 | $ 0 |

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