XML 107 R91.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Allowance for loan losses |  |  |  |
Loans held-for-investment | $ 287,128 | $ 260,520 | $ 264,959 |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 28,975,718 | 25,503,139 |  |
Total loans held-for-investment | 28,975,718 | 25,503,139 |  |
Non-PCI impaired loans |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 19,895 | 12,701 |  |
Collectively evaluated for impairment | 267,175 | 247,701 |  |
Loans held-for-investment | 287,070 | 260,402 | 264,600 | $ 260,965
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 170,887 | 206,055 |  |
Collectively evaluated for impairment | 28,322,544 | 24,654,639 |  |
Financing receivables, gross | 28,493,431 | 24,860,694 |  |
Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 58 | 118 | $ 359 | $ 714
Recorded investment in loans |  |  |  |
Financing receivables, gross | 482,287 | 642,445 |  |
Commercial Lending |  |  |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 22,210,001 | 19,917,365 |  |
Commercial Lending | Non-PCI impaired loans |  |  |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 21,859,099 | 19,432,958 |  |
Commercial Lending | Acquired with deteriorated credit quality |  |  |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 350,902 | 484,407 |  |
Commercial Lending | C&I |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 163,058 | 142,167 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 10,697,231 | 9,640,563 |  |
Total loans held-for-investment | 10,697,231 | 9,640,563 |  |
Commercial Lending | C&I | Non-PCI impaired loans |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 16,094 | 10,477 |  |
Collectively evaluated for impairment | 146,964 | 131,689 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 98,685 | 125,619 |  |
Collectively evaluated for impairment | 10,586,751 | 9,476,557 |  |
Financing receivables, gross | 10,685,436 | 9,602,176 |  |
Commercial Lending | C&I | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 0 | 1 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 11,795 | 38,387 |  |
Commercial Lending | CRE |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 41,237 | 47,927 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 8,936,897 | 8,016,109 |  |
Total loans held-for-investment | 8,936,897 | 8,016,109 |  |
Commercial Lending | CRE | Non-PCI impaired loans |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 684 | 1,263 |  |
Collectively evaluated for impairment | 40,495 | 46,552 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 35,556 | 46,508 |  |
Collectively evaluated for impairment | 8,623,653 | 7,621,153 |  |
Financing receivables, gross | 8,659,209 | 7,667,661 |  |
Commercial Lending | CRE | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 58 | 112 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 277,688 | 348,448 |  |
Commercial Lending | Residential loan | Multifamily |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 19,109 | 17,543 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 1,916,176 | 1,585,939 |  |
Total loans held-for-investment | 1,916,176 | 1,585,939 |  |
Commercial Lending | Residential loan | Multifamily | Non-PCI impaired loans |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 88 | 180 |  |
Collectively evaluated for impairment | 19,021 | 17,363 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 10,636 | 10,041 |  |
Collectively evaluated for impairment | 1,844,492 | 1,480,244 |  |
Financing receivables, gross | 1,855,128 | 1,490,285 |  |
Commercial Lending | Residential loan | Multifamily | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 61,048 | 95,654 |  |
Commercial Lending | Construction and land |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 26,881 | 24,989 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 659,697 | 674,754 |  |
Total loans held-for-investment | 659,697 | 674,754 |  |
Commercial Lending | Construction and land | Non-PCI impaired loans |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 0 | 63 |  |
Collectively evaluated for impairment | 26,881 | 24,926 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 3,973 | 5,870 |  |
Collectively evaluated for impairment | 655,353 | 666,966 |  |
Financing receivables, gross | 659,326 | 672,836 |  |
Commercial Lending | Construction and land | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 371 | 1,918 |  |
Consumer Lending |  |  |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 6,765,717 | 5,585,774 |  |
Consumer Lending | Non-PCI impaired loans |  |  |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 6,634,332 | 5,427,736 |  |
Consumer Lending | Acquired with deteriorated credit quality |  |  |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 131,385 | 158,038 |  |
Consumer Lending | Residential loan | Single-family |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 26,362 | 19,795 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 4,646,289 | 3,509,779 |  |
Total loans held-for-investment | 4,646,289 | 3,509,779 |  |
Consumer Lending | Residential loan | Single-family | Non-PCI impaired loans |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 534 | 687 |  |
Collectively evaluated for impairment | 25,828 | 19,103 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 14,338 | 14,335 |  |
Collectively evaluated for impairment | 4,514,573 | 3,356,334 |  |
Financing receivables, gross | 4,528,911 | 3,370,669 |  |
Consumer Lending | Residential loan | Single-family | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 0 | 5 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 117,378 | 139,110 |  |
Consumer Lending | HELOCs |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 7,354 | 7,506 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 1,782,924 | 1,760,776 |  |
Total loans held-for-investment | 1,782,924 | 1,760,776 |  |
Consumer Lending | HELOCs | Non-PCI impaired loans |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 4 | 31 |  |
Collectively evaluated for impairment | 7,350 | 7,475 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 5,208 | 3,682 |  |
Collectively evaluated for impairment | 1,763,709 | 1,738,170 |  |
Financing receivables, gross | 1,768,917 | 1,741,852 |  |
Consumer Lending | HELOCs | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 14,007 | 18,924 |  |
Consumer Lending | Other consumer |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 3,127 | 593 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | 336,504 | 315,219 |  |
Total loans held-for-investment | 336,504 | 315,219 |  |
Consumer Lending | Other consumer | Non-PCI impaired loans |  |  |  |
Allowance for loan losses |  |  |  |
Individually evaluated for impairment | 2,491 | 0 |  |
Collectively evaluated for impairment | 636 | 593 |  |
Recorded investment in loans |  |  |  |
Individually evaluated for impairment | 2,491 | 0 |  |
Collectively evaluated for impairment | 334,013 | 315,215 |  |
Financing receivables, gross | 336,504 | 315,215 |  |
Consumer Lending | Other consumer | Acquired with deteriorated credit quality |  |  |  |
Allowance for loan losses |  |  |  |
Loans held-for-investment | 0 | 0 |  |
Recorded investment in loans |  |  |  |
Financing receivables, gross | $ 0 | $ 4 |  |

X
- References No definition available. + Details
Name: | ewbc_RecordedInvestmentInTotalLoansReceivableRelatedToEachBalanceInAllowanceForLoanLossesAbstract
Namespace Prefix: | ewbc_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossAdditionalInformationAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesIndividuallyEvaluatedForImpairment1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The balance of financing receivables that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableCollectivelyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition The balance of financing receivables that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
Name: | us-gaap_FinancingReceivableIndividuallyEvaluatedForImpairment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SAB Topic 6.L.1) -URI http://asc.fasb.org/extlink&oid=27010918&loc=d3e74567-122707 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (b)(1)(ii) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 + Details
Name: | us-gaap_LoansAndLeasesReceivableAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date. Such amount may include accrued interest receivable in accordance with the terms of the note. The note also may contain provisions and related items including a discount or premium, payable on demand, secured, or unsecured, interest bearing or noninterest bearing, among a myriad of other features and characteristics. Excludes amounts related to receivables held-for-sale. + 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 + Details
Name: | us-gaap_NotesReceivableGross
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Net amount of the investment in a contractual right to receive money on demand or on fixed or determinable dates that is recognized as an asset in the creditor's statement of financial position. Examples include, but are not limited to, credit card receivables, notes receivable and receivables relating to lessor's rights to payments from leases other than operating leases that have been recorded as assets. Excludes trade accounts receivable with contractual maturity of one year or less and arose from the sale of goods or services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.3) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_NotesReceivableNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityAxis=ewbc_ReceivablesOriginatedOrAcquiredWithoutDeterioratedCreditQualityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityAxis=us-gaap_ReceivablesAcquiredWithDeterioratedCreditQualityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_CommercialPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_CommercialAndIndustrialLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_RealEstateLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_MultifamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_ConstructionAndLandLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivablePortfolioSegmentAxis=us-gaap_ConsumerPortfolioSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MortgageLoansOnRealEstateDescriptionTypeOfPropertyAxis=us-gaap_SingleFamilyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_HomeEquityLoanMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ewbc_OtherConsumerMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |