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Loans Receivable and Allowance for Credit Losses (Additions to Non-PCI TDRs) (Details) - Non-PCI impaired loans $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) loan | Dec. 31, 2015 USD ($) loan
Loans Modified as TDRs |  |  |
Post-Modification Outstanding Recorded Investment | $ 43,651 | $ 65,762 | $ 36,254
Commercial Lending |  |  |
Loans Modified as TDRs |  |  |
Post-Modification Outstanding Recorded Investment | $ 43,496 | $ 64,112 | $ 35,975
Commercial Lending | C&I |  |  |
Loans Modified as TDRs |  |  |
Number of Loans | loan | 16 | 18 | 18
Pre-Modification Outstanding Recorded Investment | $ 43,884 | $ 65,991 | $ 42,816
Post-Modification Outstanding Recorded Investment | 37,900 | 40,405 | 34,165
Financial Impact | $ 11,520 | $ 20,574 | $ 6,726
Commercial Lending | CRE |  |  |
Loans Modified as TDRs |  |  |
Number of Loans | loan | 4 | 6 | 3
Pre-Modification Outstanding Recorded Investment | $ 2,675 | $ 19,275 | $ 1,802
Post-Modification Outstanding Recorded Investment | 2,627 | 18,824 | 1,727
Financial Impact | $ 157 | $ 701 | $ 0
Commercial Lending | Residential loan | Multifamily |  |  |
Loans Modified as TDRs |  |  |
Number of Loans | loan | 1 |  |
Pre-Modification Outstanding Recorded Investment | $ 3,655 |  |
Post-Modification Outstanding Recorded Investment | 2,969 |  |
Financial Impact | 0 |  |
Commercial Lending | Construction and land |  |  |
Loans Modified as TDRs |  |  |
Number of Loans | loan |  | 1 | 2
Pre-Modification Outstanding Recorded Investment |  | $ 5,522 | $ 2,227
Post-Modification Outstanding Recorded Investment |  | 4,883 | 83
Financial Impact |  | 0 | 102
Consumer Lending |  |  |
Loans Modified as TDRs |  |  |
Post-Modification Outstanding Recorded Investment | $ 155 | $ 1,650 | $ 279
Consumer Lending | Residential loan | Single-family |  |  |
Loans Modified as TDRs |  |  |
Number of Loans | loan |  | 3 | 1
Pre-Modification Outstanding Recorded Investment |  | $ 1,291 | $ 281
Post-Modification Outstanding Recorded Investment |  | 1,268 | 279
Financial Impact |  | $ 0 | $ 2
Consumer Lending | HELOCs |  |  |
Loans Modified as TDRs |  |  |
Number of Loans | loan | 1 | 3 |
Pre-Modification Outstanding Recorded Investment | $ 152 | $ 491 |
Post-Modification Outstanding Recorded Investment | 155 | 382 |
Financial Impact | $ 0 | $ 1 |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524 + Details
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