XML 146 R130.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Business Segments (Operating Results and Other Key Financial Measures) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 359,765 | $ 339,910 | $ 322,775 | $ 302,669 | $ 302,127 | $ 280,317 | $ 278,865 | $ 276,172 | $ 1,325,119 | $ 1,137,481 | $ 1,053,815
Charge for funds used |  |  |  |  |  |  |  |  | (533,777) | (360,465) | (317,143)
Interest spread on funds used |  |  |  |  |  |  |  |  | 791,342 | 777,016 | 736,672
Interest expense | (40,064) | (36,755) | (32,684) | (30,547) | (29,425) | (26,169) | (25,281) | (23,968) | (140,050) | (104,843) | (103,376)
Credit on funds provided |  |  |  |  |  |  |  |  | 533,777 | 360,465 | 317,143
Interest spread on funds provided |  |  |  |  |  |  |  |  | 393,727 | 255,622 | 213,767
Net interest income before provision for credit losses | 319,701 | 303,155 | 290,091 | 272,122 | 272,702 | 254,148 | 253,584 | 252,204 | 1,185,069 | 1,032,638 | 950,439
Provision for credit losses | 15,517 | 12,996 | 10,685 | 7,068 | 10,461 | 9,525 | 6,053 | 1,440 | 46,266 | 27,479 | 14,217
Noninterest income | 45,359 | 49,624 | 47,400 | 116,023 | 48,800 | 49,341 | 44,264 | 40,513 | 258,406 | 182,918 | 183,383
Noninterest expense | 175,416 | 164,499 | 169,121 | 153,073 | 149,904 | 170,500 | 148,879 | 146,606 | 662,109 | 615,889 | 540,884
Segment income (loss) before income taxes | 174,127 | 175,284 | 157,685 | 228,004 | 161,137 | 123,464 | 142,916 | 144,671 | 735,100 | 572,188 | 578,721
Segment income after income taxes | 84,898 | $ 132,660 | $ 118,330 | $ 169,736 | 110,734 | $ 110,143 | $ 103,284 | $ 107,516 | 505,624 | 431,677 | 384,677
Segment assets | 37,150,249 |  |  |  | 34,788,840 |  |  |  | 37,150,249 | 34,788,840 | 32,350,922
Retail Banking |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 364,906 | 315,146 | 331,755
Charge for funds used |  |  |  |  |  |  |  |  | (142,619) | (95,970) | (86,769)
Interest spread on funds used |  |  |  |  |  |  |  |  | 222,287 | 219,176 | 244,986
Interest expense |  |  |  |  |  |  |  |  | (76,770) | (60,180) | (53,088)
Credit on funds provided |  |  |  |  |  |  |  |  | 445,304 | 300,446 | 261,117
Interest spread on funds provided |  |  |  |  |  |  |  |  | 368,534 | 240,266 | 208,029
Net interest income before provision for credit losses |  |  |  |  |  |  |  |  | 590,821 | 459,442 | 453,015
Provision for credit losses |  |  |  |  |  |  |  |  | 1,812 | (4,356) | (5,835)
Noninterest income |  |  |  |  |  |  |  |  | 55,093 | 51,435 | 46,265
Noninterest expense |  |  |  |  |  |  |  |  | 320,287 | 306,570 | 276,144
Segment income (loss) before income taxes |  |  |  |  |  |  |  |  | 323,815 | 208,663 | 228,971
Segment income after income taxes |  |  |  |  |  |  |  |  | 190,404 | 122,256 | 134,383
Segment assets | 9,316,587 |  |  |  | 7,821,610 |  |  |  | 9,316,587 | 7,821,610 | 7,095,737
Commercial Banking |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 844,303 | 726,013 | 654,966
Charge for funds used |  |  |  |  |  |  |  |  | (326,902) | (216,849) | (163,601)
Interest spread on funds used |  |  |  |  |  |  |  |  | 517,401 | 509,164 | 491,365
Interest expense |  |  |  |  |  |  |  |  | (24,603) | (16,892) | (18,025)
Credit on funds provided |  |  |  |  |  |  |  |  | 61,019 | 38,636 | 36,251
Interest spread on funds provided |  |  |  |  |  |  |  |  | 36,416 | 21,744 | 18,226
Net interest income before provision for credit losses |  |  |  |  |  |  |  |  | 553,817 | 530,908 | 509,591
Provision for credit losses |  |  |  |  |  |  |  |  | 44,454 | 31,835 | 20,052
Noninterest income |  |  |  |  |  |  |  |  | 110,104 | 96,010 | 71,867
Noninterest expense |  |  |  |  |  |  |  |  | 193,176 | 172,259 | 159,987
Segment income (loss) before income taxes |  |  |  |  |  |  |  |  | 426,291 | 422,824 | 401,419
Segment income after income taxes |  |  |  |  |  |  |  |  | 251,834 | 248,474 | 236,459
Segment assets | 21,431,472 |  |  |  | 19,128,510 |  |  |  | 21,431,472 | 19,128,510 | 17,923,319
Other |  |  |  |  |  |  |  |  |  |  |
Segment Reporting Information |  |  |  |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  |  |  | 115,910 | 96,322 | 67,094
Charge for funds used |  |  |  |  |  |  |  |  | (64,256) | (47,646) | (66,773)
Interest spread on funds used |  |  |  |  |  |  |  |  | 51,654 | 48,676 | 321
Interest expense |  |  |  |  |  |  |  |  | (38,677) | (27,771) | (32,263)
Credit on funds provided |  |  |  |  |  |  |  |  | 27,454 | 21,383 | 19,775
Interest spread on funds provided |  |  |  |  |  |  |  |  | (11,223) | (6,388) | (12,488)
Net interest income before provision for credit losses |  |  |  |  |  |  |  |  | 40,431 | 42,288 | (12,167)
Provision for credit losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Noninterest income |  |  |  |  |  |  |  |  | 93,209 | 35,473 | 65,251
Noninterest expense |  |  |  |  |  |  |  |  | 148,646 | 137,060 | 104,753
Segment income (loss) before income taxes |  |  |  |  |  |  |  |  | (15,006) | (59,299) | (51,669)
Segment income after income taxes |  |  |  |  |  |  |  |  | 63,386 | 60,947 | 13,835
Segment assets | $ 6,402,190 |  |  |  | $ 7,838,720 |  |  |  | $ 6,402,190 | $ 7,838,720 | $ 7,331,866

X
- Definition Charge for funds used. + References No definition available. + Details
Name: | ewbc_ChargeForFundsUsed
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Credit on funds provided. + References No definition available. + Details
Name: | ewbc_CreditOnFundsProvided
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest spread on funds provided. + References No definition available. + Details
Name: | ewbc_InterestSpreadOnFundsProvided
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Interest spread on funds used. + References No definition available. + Details
Name: | ewbc_InterestSpreadOnFundsUsed
Namespace Prefix: | ewbc_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(12)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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(11)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
Name: | us-gaap_Assets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=68072869&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(10)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(15)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(8)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 + Details
Name: | us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_InterestAndDividendIncomeOperating
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_InterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The net amount of operating interest income (expense). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.10) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_InterestIncomeExpenseNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The portion of profit or loss for the period, net of income taxes, which is attributable to the parent. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(22)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(18)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(20)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
Name: | us-gaap_NetIncomeLoss
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Total aggregate amount of all noninterest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.14) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_NoninterestExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The total amount of noninterest income which may be derived from: (1) fees and commissions; (2) premiums earned; (3) insurance policy charges; (4) the sale or disposal of assets; and (5) other sources not otherwise specified. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.13) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_NoninterestIncome
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value. + 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 (c)(2) -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 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.11) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
Name: | us-gaap_ProvisionForLoanLeaseAndOtherLosses
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SegmentReportingInformationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ewbc_RetailBankingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=ewbc_CommercialBankingMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=us-gaap_AllOtherSegmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |