East West Bancorp (EWBC) 10-Q 9 May 17 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 30, 2017
Document and Entity Information
Entity Registrant Name	EAST WEST BANCORP INC
Entity Central Index Key	1,069,157
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-Q
Document Period End Date	Mar. 31, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Common Stock, Shares Outstanding		144,484,091

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Cash and due from banks	$ 346,005	$ 460,559
Interest-bearing cash with banks	2,088,638	1,417,944
Cash and cash equivalents	2,434,643	1,878,503
Interest-bearing deposits with banks	249,849	323,148
Securities purchased under resale agreements (“resale agreements”)	1,650,000	2,000,000
Securities :
Available-for-sale investment securities, at fair value (includes assets pledged as collateral of $640,853 in 2017 and $767,437 in 2016)	2,962,034	3,335,795
Held-to-maturity investment security, at cost (fair value of $133,656 in 2017 and $144,593 in 2016)	132,497	143,971
Restricted equity securities, at cost	73,019	72,775
Loans held-for-sale	28,931	23,076
Loans held-for-investment (net of allowance for loan losses of $263,094 in 2017 and $260,520 in 2016; includes assets pledged as collateral of $17,159,894 in 2017 and $16,441,068 in 2016)	26,198,198	25,242,619
Investments in qualified affordable housing partnerships, net	176,965	183,917
Investments in tax credit and other investments, net	177,023	173,280
Premises and equipment (net of accumulated depreciation of $103,933 in 2017 and $114,890 in 2016)	128,002	159,923
Goodwill	469,433	469,433
Other assets	661,532	782,400
TOTAL	35,342,126	34,788,840
Customer deposits:
Noninterest-bearing	10,658,946	10,183,946
Interest-bearing	19,884,029	19,707,037
Total deposits	30,542,975	29,890,983
Short-term borrowings	42,023	60,050
Federal Home Loan Bank (“FHLB”) advances	322,196	321,643
Securities sold under repurchase agreements (“repurchase agreements”)	200,000	350,000
Long-term debt	181,388	186,327
Accrued expenses and other liabilities	487,590	552,096
Total liabilities	31,776,172	31,361,099
COMMITMENTS AND CONTINGENCIES (Note 11)
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 165,119,710 and 164,604,072 shares issued in 2017 and 2016, respectively.	164	164
Additional paid-in capital	1,732,585	1,727,434
Retained earnings	2,328,264	2,187,676
Treasury stock at cost — 20,658,144 shares in 2017 and 20,436,621 shares in 2016.	(451,541)	(439,387)
Accumulated other comprehensive loss (“AOCI”), net of tax	(43,518)	(48,146)
Total stockholders’ equity	3,565,954	3,427,741
TOTAL	$ 35,342,126	$ 34,788,840

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Available-for-sale securities pledged as collateral	$ 640,853	$ 767,437
Held-to-maturity investment security, fair value	133,656	144,593
Allowance for loan losses	263,094	260,520
Loans held-for-investment pledged as collateral	17,159,894	16,441,068
Premises and equipment, accumulated depreciation	$ 103,933	$ 114,890
STOCKHOLDERS’ EQUITY
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	200,000,000	200,000,000
Common stock, shares issued (in shares)	165,119,710	164,604,072
Treasury stock, shares (in shares)	20,658,144	20,436,621

Consolidated Statements of Inco

Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 272,061	$ 253,542
Investment securities	15,247	11,193
Resale agreements	9,468	6,677
Restricted equity securities	777	795
Interest-bearing cash and deposits with banks	5,116	3,965
Total interest and dividend income	302,669	276,172
INTEREST EXPENSE
Customer deposits	23,672	19,297
Federal funds purchased and other short-term borrowings	413	9
FHLB advances	2,030	1,500
Repurchase agreements	3,143	1,926
Long-term debt	1,289	1,236
Total interest expense	30,547	23,968
Net interest income before provision for credit losses	272,122	252,204
Provision for credit losses	7,068	1,440
Net interest income after provision for credit losses	265,054	250,764
NONINTEREST INCOME
Branch fees	10,296	10,222
Letters of credit fees and foreign exchange income	11,069	9,553
Ancillary loan fees	4,982	3,577
Wealth management fees	4,530	3,051
Derivative fees and other income	2,506	2,543
Net gains on sales of loans	2,754	1,927
Net gains on sales of available-for-sale investment securities	2,474	3,842
Net gains on sales of fixed assets	72,007	189
Other fees and operating income	5,405	5,609
Total noninterest income	116,023	40,513
NONINTEREST EXPENSE
Compensation and employee benefits	84,603	71,837
Occupancy and equipment expense	15,640	14,415
Deposit insurance premiums and regulatory assessments	5,929	5,418
Legal expense	3,062	3,007
Data processing	2,947	2,688
Consulting expense	1,919	8,452
Deposit related expenses	2,365	2,320
Computer software expense	3,968	2,741
Other operating expense	16,463	19,469
Amortization of tax credit and other investments	14,360	14,155
Amortization of core deposit intangibles	1,817	2,104
Total noninterest expense	153,073	146,606
INCOME BEFORE INCOME TAXES	228,004	144,671
INCOME TAX EXPENSE	58,268	37,155
NET INCOME	$ 169,736	$ 107,516
EARNINGS PER SHARE (“EPS”)
BASIC (in dollars per share)	$ 1.18	$ 0.75
DILUTED (in dollars per share)	$ 1.16	$ 0.74
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	144,249	143,958
DILUTED (in shares)	145,732	144,803
DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.2	$ 0.20

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 169,736	$ 107,516
Other comprehensive income, net of tax:
Net change in unrealized gains on available-for-sale investment securities	3,621	12,916
Foreign currency translation adjustments	1,007	(33)
Other comprehensive income	4,628	12,883
COMPREHENSIVE INCOME	$ 174,364	$ 120,399

Consolidated Statements of Chan

Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Common Stock and Additional Paid-in Capital	Retained Earnings	Treasury Stock	AOCI, net of tax
BALANCE (in shares) at Dec. 31, 2015		143,909,233
Beginning balance at Dec. 31, 2015	$ 3,122,950		$ 1,701,459	$ 1,872,594	$ (436,162)	$ (14,941)
Increase (Decrease) in Stockholders' Equity
Net income	107,516			107,516
Other comprehensive income	12,883					12,883
Stock compensation costs	4,575		4,575
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)		154,518
Net activity of common stock pursuant to various stock compensation plans and agreements	(2,068)		986		(3,054)
Common stock dividends	(29,075)			(29,075)
BALANCE (in shares) at Mar. 31, 2016		144,063,751
Ending balance at Mar. 31, 2016	3,216,781		1,707,020	1,951,035	(439,216)	(2,058)
BALANCE (in shares) at Dec. 31, 2016		144,167,451
Beginning balance at Dec. 31, 2016	3,427,741		1,727,598	2,187,676	(439,387)	(48,146)
Increase (Decrease) in Stockholders' Equity
Net income	169,736			169,736
Other comprehensive income	4,628					4,628
Stock compensation costs	5,151		5,151
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)		294,115
Net activity of common stock pursuant to various stock compensation plans and agreements	(12,154)				(12,154)
Common stock dividends	(29,148)			(29,148)
BALANCE (in shares) at Mar. 31, 2017		144,461,566
Ending balance at Mar. 31, 2017	$ 3,565,954		$ 1,732,749	$ 2,328,264	$ (451,541)	$ (43,518)

Consolidated Statements of Cash

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 169,736	$ 107,516
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	33,061	28,613
Accretion of discount and amortization of premiums, net	(4,931)	(15,855)
Stock compensation costs	5,151	4,575
Deferred tax expenses	2,295	3,718
Provision for credit losses	7,068	1,440
Net gains on sales of loans	(2,754)	(1,927)
Net gains on sales of available-for-sale investment securities	(2,474)	(3,842)
Net gains on sales of premises and equipment	(72,007)	(189)
Originations and purchases of loans held-for-sale	(4,287)	(1,403)
Proceeds from sales and paydowns/payoffs in loans held-for-sale	4,773	2,229
Net change in accrued interest receivable and other assets	93,501	2,057
Net change in accrued expenses and other liabilities	(37,791)	57,957
Other net operating activities	(6,064)	(1,339)
Total adjustments	15,541	76,034
Net cash provided by operating activities	185,277	183,550
Net (increase) decrease in:
Loans held-for-investment	(1,085,449)	(165,726)
Interest-bearing deposits with banks	75,140	(3,531)
Investments in qualified affordable housing partnerships, tax credit and other investments	(38,354)	(8,390)
Purchases of:
Resale agreements	(200,000)	(1,000,000)
Available-for-sale investment securities	(50,936)	(223,873)
Loans held-for-investment	(147,242)	(239,399)
Premises and equipment	(1,191)	(2,259)
Proceeds from sale of:
Available-for-sale investment securities	302,656	652,753
Loans held-for-investment	276,643	151,832
OREO	3,958	384
Premises and equipment	116,021	0
Paydowns and maturities of resale agreements	400,000	1,000,000
Repayments, maturities and redemptions of available-for-sale investment securities	125,006	158,268
Other net investing activities	11,345	10,467
Net cash (used in) provided by investing activities	(212,403)	330,526
Net increase in:
Customer deposits	646,188	1,116,272
Short-term borrowings	(18,524)	9,962
Payments for:
Repayment of FHLB advances	0	(700,000)
Repayment of long-term debt	(5,000)	(5,000)
Repurchase of vested shares due to employee tax liability	(12,154)	(3,054)
Cash dividends on common stocks	(30,039)	(29,325)
Other net financing activities	0	986
Net cash provided by financing activities	580,471	389,841
Effect of exchange rate changes on cash and cash equivalents	2,795	493
NET INCREASE IN CASH AND CASH EQUIVALENTS	556,140	904,410
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	1,878,503	1,360,887
CASH AND CASH EQUIVALENTS, END OF PERIOD	2,434,643	2,265,297
Cash paid (received) during the period for:
Interest	30,361	24,309
Income tax refunds, net	(230)	(28,509)
Noncash investing and financing activities:
Loans held-for-investment transferred to loans held-for-sale, net	278,024	308,722
Held-to-maturity investment security retained from securitization of loans	0	160,135
Dividends payable	$ 891	$ 250

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Note 1 — Basis of Presentation East West Bancorp, Inc. (referred to herein on an unconsolidated basis as “East West” and on a consolidated basis as the “Company”) is a registered bank holding company that offers a full range of banking services to individuals and businesses through its subsidiary bank, East West Bank and its subsidiaries (“East West Bank” or the “Bank”). The unaudited interim Consolidated Financial Statements in this Form 10-Q include the accounts of East West, East West Bank, East West Insurance Services, Inc., and various subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. As of March 31, 2017 , East West also has six wholly-owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with FASB Accounting Standards Codification (“ASC”) Topic 810, the Trusts are not included on the Consolidated Financial Statements. The unaudited interim Consolidated Financial Statements presented in accordance with United States Generally Accepted Accounting Principles (“U.S. GAAP”), applicable guidelines prescribed by regulatory authorities, and general practices in the banking industry, reflect all adjustments that, in the opinion of management, are necessary for fair statement of the interim period financial statements. Certain items on the Consolidated Financial Statements and notes for the prior years have been reclassified to conform to the current period presentation. The current period’s results of operations are not necessarily indicative of results that may be expected for any other interim period or for the year as a whole. Events subsequent to the Consolidated Balance Sheet date have been evaluated through the date the financial statements are issued for inclusion in the accompanying financial statements. The unaudited interim Consolidated Financial Statements should be read in conjunction with the audited Consolidated Financial Statements and notes thereto, included in the Company’s 2016 Form 10-K.

Current Accounting Developments

Current Accounting Developments	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Current Accounting Developments	Note 2 — Current Accounting Developments NEW ACCOUNTING PRONOUNCEMENTS ADOPTED In March 2016, the FASB issued Accounting Standards Update (“ASU”) 2016-05, Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships , to clarify that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument in an existing hedging relationship would not be considered a termination of the derivative instrument or a change in a critical term of the hedging relationship provided that all other hedge accounting criteria in ASC 815 continue to be met. This clarification applies to both cash flow and fair value hedging relationships. The Company adopted this guidance prospectively in the first quarter of 2017. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments which requires an entity to use a four step decision model when assessing contingent call (put) options that can accelerate the payment of principal on debt instruments to determine whether they are clearly and closely related to their debt hosts. The Company adopted this guidance on a modified retrospective basis in the first quarter of 2017. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-07, Investments — Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting, to eliminate the requirement for an investor to retroactively apply the equity method when its increase in ownership interest (or degree of influence) in an investee triggers equity method accounting. The amendments in ASU 2016-07 also require that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in AOCI at the date the investment becomes qualified for use of the equity method. The Company adopted this guidance prospectively in the first quarter of 2017. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-09, Compensation — Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification in the statement of cash flows. The Company adopted ASU 2016-09 in the first quarter of 2017. The changes that impacted the Company included a requirement that excess tax benefits and deficiencies be recognized as a component of Income tax expense on the Consolidated Statements of Income rather than Additional paid-in capital on the Consolidated Statements of Changes in Stockholders’ Equity as required in the previous guidance. Net excess tax benefits for restricted stock units (“RSUs”) of approximately $4.4 million were recognized by the Company as a component of Income tax expense on the Consolidated Statements of Income during the first quarter of 2017. This change also removes the impact of the excess tax benefits and deficiencies from the calculation of diluted EPS. In addition, ASU 2016-09 no longer requires a presentation of excess tax benefits and deficiencies as both an operating outflow and financing inflow on the Consolidated Statements of Cash Flows. Instead, excess tax benefits and deficiencies are recorded along with other income tax cash flows as an operating activity on the Consolidated Statements of Cash Flows. These changes were applied on a prospective basis. The adoption of ASU 2016-09 will result in increased volatility to the Company’s income tax expense but is not expected to have a material impact on the Consolidated Balance Sheets or the Consolidated Statements of Changes in Stockholders’ Equity. The income tax expense volatility is dependent on the Company’s stock price on the dates the RSUs vest, which occur primarily in the first quarter of each year. The Company has elected to retain its existing accounting policy election to estimate award forfeitures. RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) . The new guidance replaces existing revenue recognition guidance for contracts to provide goods or services to customers. ASU 2014-09 clarifies the principles for recognizing revenue and replaces nearly all existing revenue recognition guidance in U.S. GAAP. Quantitative and qualitative disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers are also required. ASU 2014-09 as amended by ASU 2015-14, ASU 2016-08, ASU 2016-10, ASU 2016-12 and ASU 2016-20, is effective for interim and annual periods beginning after December 15, 2017 and is applied on either a modified retrospective or full retrospective basis. Early adoption is permitted for interim and annual periods beginning after December 15, 2016. The Company’s revenue is mainly comprised of net interest income and noninterest income. The scope of the guidance explicitly excludes net interest income, as well as other revenues from financial instruments such as loans, leases, securities and derivatives. The Company has conducted a comprehensive scoping exercise to determine the revenue streams that are in the scope of these updates. Preliminary results indicate that certain noninterest income financial statement line items may contain revenue streams that are in the scope of these updates. The Company’s next implementation efforts include identifying contracts within the scope of the new guidance and assessing the related noninterest income revenues to determine if any accounting or internal control changes will be required under the provisions of the new guidance. The Company continues to evaluate the impact of ASU 2014-09 on our noninterest income and on our presentation and disclosures. In January 2016, the FASB issued ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 requires equity investments, except those accounted for under the equity method of accounting or consolidated, to be measured at fair value with changes recognized in net income. If there is no readily determinable fair value, the guidance allows entities the ability to measure investments at cost less impairment, whereby impairment is based on a qualitative assessment. The guidance eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value of financial instruments measured at amortized cost and changes the presentation of financial assets and financial liabilities on the Consolidated Balance Sheets or in the footnotes. If an entity has elected the fair value option to measure liabilities, the new accounting guidance requires the portion of the change in the fair value of a liability resulting from credit risk to be presented in Other Comprehensive Income . The Company has not elected to measure any of its liabilities at fair value, and therefore, this aspect of the guidance is not applicable to us. ASU 2016-01 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is not permitted except for certain specific changes under the fair value option guidance. To adopt the amendments, the Company is required to make a cumulative effect adjustment to the Consolidated Balance Sheets as of the beginning of the fiscal year in which the guidance is effective. However, the amendments related to equity securities without readily determinable fair values (including disclosure requirements) should be applied prospectively to equity investments that exist as of the adoption date. The Company is currently evaluating the impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which is intended to increase transparency and comparability in the accounting for lease transactions. ASU 2016-02 requires lessees to recognize all leases longer than 12 months on the Consolidated Balance Sheet as lease assets and lease liabilities and provide quantitative and qualitative disclosures regarding key information about leasing arrangements. For short-term leases with a term of 12 months or less, lessees can make a policy election not to recognize lease assets and lease liabilities. Lessor accounting is largely unchanged. ASU 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018 with modified retrospective application. Early adoption is permitted. The Company expects the adoption of ASU 2016-02 to result in additional assets and liabilities, as the Company will be required to recognize operating leases on its Consolidated Balance Sheets. The Company does not expect a material impact to its recognition of operating lease expense on its Consolidated Statements of Income. In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments to introduce a new approach based on expected losses to estimate credit losses on certain types of financial instruments, which modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The new “expected credit loss” impairment model will apply to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loans, available-for-sale and held-to-maturity debt securities, net investments in leases and off-balance-sheet credit exposures. For available-for-sale debt securities with unrealized losses, ASU 2016-13 does not change the measurement method of credit losses, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. ASU 2016-13 also expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loans and lease losses and requires disclosure of the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination (i.e., by vintage year). ASU 2016-13 is effective for the fiscal years beginning after December 15, 2019, including interim periods within those fiscal years using a modified retrospective approach through a cumulative effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. Earlier adoption is permitted as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. While the Company is still evaluating the impact on its Consolidated Financial Statements, the Company expects that ASU 2016-13 may result in an increase in the allowance for credit losses due to the following factors: 1) the allowance for credit losses provides for expected credit losses over the remaining expected life of the loan portfolio, and will consider expected future changes in macroeconomic conditions; 2) the nonaccretable difference on the purchased credit impaired (“PCI”) loans will be recognized as an allowance, offset by an increase in the carrying value of the PCI loans; and 3) an allowance may be established for estimated credit losses on available-for-sale and held-to-maturity debt securities. The amount of the increase will be impacted by the portfolio composition and quality, as well as the economic conditions and forecasts as of the adoption date. The Company has began its implementation efforts by identifying key interpretive issues, and assessing its processes and identifying the system requirements against the new guidance to determine what modifications may be required. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flow (Topic 230): Classification of Certain Cash Receipts and Cash Payments , to provide guidance on the classification of certain cash receipts and payments on the Consolidated Statements of Cash Flows in order to reduce diversity in practice. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The guidance requires application using a retrospective transition method. Early adoption is permitted. The Company does not expect the adoption of this guidance to have a material impact on its Consolidated Financial Statements. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which requires the Company to include in its cash and cash equivalents balances on the Statements of Cash Flows those amounts that are deemed to be restricted cash and restricted cash equivalents. In addition, the Company is required to explain the changes in the combined total of restricted and unrestricted balances on the Statements of Cash Flows. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, where the guidance should be applied using a retrospective transition method to each period presented. Early adoption is permitted. The Company is currently evaluating the impact on its Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment to simplify the accounting for goodwill impairment. An entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, impairment will be measured using the difference between the carrying amount and the fair value of the reporting unit. ASU 2017-04 also eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment. ASU 2017-04 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years and should be applied prospectively. Early adoption is permitted for interim or annual goodwill impairment tests with measurement dates after January 1, 2017. The Company is currently evaluating the impact on its Consolidated Financial Statements. In March 2017, the FASB issued ASU 2017-08, Receivables — Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities , which amends the amortization period for certain purchased callable debt securities held at a premium, shortening such period to the earliest call date. Therefore, entities will no longer recognize a loss in earnings upon the debtor’s exercise of a call on a purchased callable debt security held at a premium. The ASU does not require any accounting change for debt securities held at a discount; the discount continues to be amortized as an adjustment of yield over the contractual life (to maturity) of the instrument. ASU 2017-08 is effective for interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted. Entities must apply a modified retrospective approach, with the cumulative effect adjustment recognized to retained earnings as of the beginning of the period of adoption. Entities are also required to provide disclosures about a change in accounting principle in the period of adoption. The Company is currently evaluating the impact on its Consolidated Financial Statements.

Disposition of Commercial Prope

Disposition of Commercial Property	3 Months Ended
	Mar. 31, 2017
Leases [Abstract]
Disposition of Commercial Property	Note 3 — Disposition of Commercial Property In the first quarter of 2017, the Company completed the sale and leaseback of a commercial property in San Francisco, California for a sale price of $120.6 million and entered into a lease agreement for part of the property, including a retail branch and office facilities. The total pre-tax profit from the sale was $85.4 million with $71.7 million recognized in the first quarter of 2017 and $13.7 million to be deferred over the term of the lease agreement. The first quarter 2017 diluted EPS impact from the sale of the commercial property was $0.28 per share, net of tax.

Fair Value Measurement and Fair

Fair Value Measurement and Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurement and Fair Value of Financial Instruments	Note 4 — Fair Value Measurement and Fair Value of Financial Instruments In determining fair value, the Company uses various methods including market and income approaches. Based on these approaches, the Company utilizes certain assumptions that market participants would use in pricing the asset or liability. These inputs can be readily observable, market corroborated or generally unobservable. The Company utilizes valuation techniques that maximize the use of observable inputs and minimize the use of unobservable inputs. The fair value hierarchy noted below is based on the quality and reliability of the information used to determine fair value. The fair value hierarchy gives the highest priority to quoted prices available in active markets and the lowest priority to data lacking transparency. The fair value of the Company’s assets and liabilities is classified and disclosed in one of the following three categories: • Level 1 — Valuation is based on quoted prices for identical instruments traded in active markets. • Level 2 — Valuation is based on quoted prices for similar instruments in active markets; quoted prices for identical or similar instruments in markets that are not active; and model-derived valuations whose inputs are observable and can be corroborated by market data. • Level 3 — Valuation is based on significant unobservable inputs for determining the fair value of assets or liabilities. These significant unobservable inputs reflect assumptions that market participants may use in pricing the assets or liabilities. In determining the appropriate hierarchy levels, the Company performs an analysis of the assets and liabilities that are subject to fair value disclosure. The Company’s assets and liabilities are classified in their entirety based on the lowest level of input that is significant to their fair value measurements. The following tables present financial assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016 : Assets (Liabilities) Measured at Fair Value on a Recurring Basis ($ in thousands) Fair Value Measurements Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Available-for-sale investment securities: U.S. Treasury securities $ 700,860 $ 700,860 $ — $ — U.S. government agency and U.S. government sponsored enterprise debt securities 180,863 — 180,863 — U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 264,522 — 264,522 — Residential mortgage-backed securities 1,179,755 — 1,179,755 — Municipal securities 147,069 — 147,069 — Non-agency residential mortgage-backed securities: Investment grade 10,730 — 10,730 — Corporate debt securities: Investment grade 2,254 — 2,254 — Non-investment grade 9,184 — 9,184 — Foreign bonds: Investment grade 425,868 — 425,868 — Other securities 40,929 31,075 9,854 — Total available-for-sale investment securities $ 2,962,034 $ 731,935 $ 2,230,099 $ — Derivative assets: Interest rate swaps and options $ 61,586 $ — $ 61,586 $ — Foreign exchange contracts $ 8,220 $ — $ 8,220 $ — Credit risk participation agreements (“RPAs”) $ 3 $ — $ 3 $ — Derivative liabilities: Interest rate swaps on certificates of deposit $ (6,793 ) $ — $ (6,793 ) $ — Interest rate swaps and options $ (60,204 ) $ — $ (60,204 ) $ — Foreign exchange contracts $ (7,357 ) $ — $ (7,357 ) $ — RPAs $ (2 ) $ — $ (2 ) $ — Assets (Liabilities) Measured at Fair Value on a Recurring Basis ($ in thousands) Fair Value Measurements Quoted Prices in Significant Significant Unobservable Inputs (Level 3) Available-for-sale investment securities: U.S. Treasury securities $ 720,479 $ 720,479 $ — $ — U.S. government agency and U.S. government sponsored enterprise debt securities 274,866 — 274,866 — U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 266,799 — 266,799 — Residential mortgage-backed securities 1,258,747 — 1,258,747 — Municipal securities 147,654 — 147,654 — Non-agency residential mortgage-backed securities: Investment grade 11,477 — 11,477 — Corporate debt securities: Investment grade 222,377 — 222,377 — Non-investment grade 9,173 — 9,173 — Foreign bonds: Investment grade 383,894 — 383,894 — Other securities 40,329 30,991 9,338 — Total available-for-sale investment securities $ 3,335,795 $ 751,470 $ 2,584,325 $ — Derivative assets: Foreign currency forward contracts $ 4,325 $ — $ 4,325 $ — Interest rate swaps and options $ 67,578 $ — $ 67,578 $ — Foreign exchange contracts $ 11,874 $ — $ 11,874 $ — RPAs $ 3 $ — $ 3 $ — Derivative liabilities: Interest rate swaps on certificates of deposit $ (5,976 ) $ — $ (5,976 ) $ — Interest rate swaps and options $ (65,131 ) $ — $ (65,131 ) $ — Foreign exchange contracts $ (11,213 ) $ — $ (11,213 ) $ — RPAs $ (3 ) $ — $ (3 ) $ — At each reporting period, all assets and liabilities for which the fair value measurement is based on significant unobservable inputs are classified as Level 3. There were no assets or liabilities measured using significant unobservable inputs (Level 3) on a recurring basis as of March 31, 2017 and December 31, 2016, and during the three months ended March 31, 2017 and 2016 . Transfers into or out of fair value hierarchy classifications are made if the significant inputs used in the financial models measuring the fair values of the assets and liabilities become unobservable or observable in the current marketplace. The Company’s policy, with respect to transfers between levels of the fair value hierarchy, is to recognize transfers into and out of each level as of the end of the reporting period. There were no transfers of assets and liabilities measured on a recurring basis in and out of Level 1, Level 2 and Level 3 during the three months ended March 31, 2017 and 2016 . Assets measured at fair value on a nonrecurring basis include certain non-purchased credit impaired (“non-PCI”) loans that were impaired, OREO and loans held-for-sale. These fair value adjustments result from impairments recognized during the period on certain non-PCI impaired loans, application of fair value less cost to sell on OREO and application of the lower of cost or fair value on loans held-for-sale. The following tables present the carrying amounts of assets included on the Consolidated Balance Sheets that had fair value changes measured on a nonrecurring basis: Assets Measured at Fair Value on a Nonrecurring Basis ($ in thousands) Fair Value Measurements Quoted Prices in Significant Significant Unobservable Inputs (Level 3) Non-PCI impaired loans: Commercial real estate (“CRE”) $ 10,042 $ — $ — $ 10,042 Commercial and industrial (“C&I”) 47,829 — — 47,829 Residential 2,522 — — 2,522 Consumer 610 — — 610 Total non-PCI impaired loans $ 61,003 $ — $ — $ 61,003 OREO $ 70 $ — $ — $ 70 Assets Measured at Fair Value on a Nonrecurring Basis ($ in thousands) Fair Value Measurements Quoted Prices in Significant Significant Unobservable Inputs (Level 3) Non-PCI impaired loans: CRE $ 14,908 $ — $ — $ 14,908 C&I 52,172 — — 52,172 Residential 2,464 — — 2,464 Consumer 610 — — 610 Total non-PCI impaired loans $ 70,154 $ — $ — $ 70,154 OREO $ 345 $ — $ — $ 345 Loans held-for-sale $ 22,703 $ — $ 22,703 $ — The following table presents the fair value adjustments of assets measured on a nonrecurring basis recognized during the three months ended and which were included on the Consolidated Balance Sheets as of March 31, 2017 and 2016 : Three Months Ended March 31, ($ in thousands) 2017 2016 Non-PCI impaired loans: CRE $ (64 ) $ 2,178 C&I 32 (1,935 ) Residential 82 (83 ) Consumer (1 ) 3 Total non-PCI impaired loans $ 49 $ 163 OREO $ (285 ) $ (461 ) Loans held-for-sale $ — $ (2,351 ) The following table presents the quantitative information about the significant unobservable inputs used in the valuation of assets measured on a nonrecurring basis classified as Level 3 as of March 31, 2017 and December 31, 2016 : ($ in thousands) Fair Value Valuation Unobservable Range of Inputs Weighted March 31, 2017 Non-PCI impaired loans $ 31,453 Discounted cash flow Discount 0% — 74% 11% $ 29,550 Market comparables Discount (1) 0% — 100% 7% OREO $ 70 Appraisal Selling cost 8% 8% December 31, 2016 Non-PCI impaired loans $ 31,835 Discounted cash flow Discount 0% — 62% 7% $ 38,319 Market comparables Discount (1) 0% — 100% 18% OREO $ 345 Appraisal Selling cost 8% 8% (1) Discount is adjusted for factors such as liquidation cost of collateral and selling cost. The following tables present the carrying and fair values per the fair value hierarchy of certain financial instruments, excluding those measured at fair value on a recurring basis, as of March 31, 2017 and December 31, 2016 : ($ in thousands) March 31, 2017 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 2,434,643 $ 2,434,643 $ — $ — $ 2,434,643 Interest-bearing deposits with banks $ 249,849 $ — $ 249,849 $ — $ 249,849 Resale agreements (1) $ 1,650,000 $ — $ 1,628,839 $ — $ 1,628,839 Held-to-maturity investment security $ 132,497 $ — $ — $ 133,656 $ 133,656 Loans held-for-sale $ 28,931 $ — $ 28,931 $ — $ 28,931 Loans held-for-investment, net $ 26,198,198 $ — $ — $ 25,825,039 $ 25,825,039 Restricted equity securities $ 73,019 $ — $ 73,019 $ — $ 73,019 Accrued interest receivable $ 102,067 $ — $ 102,067 $ — $ 102,067 Financial liabilities: Customer deposits: Demand, interest checking, savings and money market deposits $ 24,700,811 $ — $ 24,700,811 $ — $ 24,700,811 Time deposits $ 5,842,164 $ — $ 5,837,924 $ — $ 5,837,924 Short-term borrowings $ 42,023 $ — $ 42,023 $ — $ 42,023 FHLB advances $ 322,196 $ — $ 336,619 $ — $ 336,619 Repurchase agreements (1) $ 200,000 $ — $ 260,545 $ — $ 260,545 Long-term debt $ 181,388 $ — $ 182,502 $ — $ 182,502 Accrued interest payable $ 9,626 $ — $ 9,626 $ — $ 9,626 (1) Resale and repurchase agreements are reported net pursuant to ASC 210-20-45, Balance Sheet Offsetting . As of March 31, 2017 , $250.0 million out of $450.0 million of repurchase agreements was eligible for netting against resale agreements. ($ in thousands) December 31, 2016 Carrying Level 1 Level 2 Level 3 Estimated Financial assets: Cash and cash equivalents $ 1,878,503 $ 1,878,503 $ — $ — $ 1,878,503 Interest-bearing deposits with banks $ 323,148 $ — $ 323,148 $ — $ 323,148 Resale agreements (1) $ 2,000,000 $ — $ 1,980,457 $ — $ 1,980,457 Held-to-maturity investment security $ 143,971 $ — $ — $ 144,593 $ 144,593 Loans held-for-sale $ 23,076 $ — $ 23,076 $ — $ 23,076 Loans held-for-investment, net $ 25,242,619 $ — $ — $ 24,915,143 $ 24,915,143 Restricted equity securities $ 72,775 $ — $ 72,775 $ — $ 72,775 Accrued interest receivable $ 100,524 $ — $ 100,524 $ — $ 100,524 Financial liabilities: Customer deposits: Demand, interest checking, savings and money market deposits $ 24,275,714 $ — $ 24,275,714 $ — $ 24,275,714 Time deposits $ 5,615,269 $ — $ 5,611,746 $ — $ 5,611,746 Short-term borrowings $ 60,050 $ — $ 60,050 $ — $ 60,050 FHLB advances $ 321,643 $ — $ 334,859 $ — $ 334,859 Repurchase agreements (1) $ 350,000 $ — $ 411,368 $ — $ 411,368 Long-term debt $ 186,327 $ — $ 186,670 $ — $ 186,670 Accrued interest payable $ 9,440 $ — $ 9,440 $ — $ 9,440 (1) Resale and repurchase agreements are reported net pursuant to ASC 210-20-45, Balance Sheet Offsetting . As of December 31, 2016 , $100.0 million out of $450.0 million of repurchase agreements was eligible for netting against resale agreements. The following is a description of the valuation methodologies and significant assumptions used to measure financial assets and liabilities at fair value and to estimate fair value for certain financial instruments not recorded at fair value. The description also includes the level of the fair value hierarchy in which the assets or liabilities are classified. Cash and Cash Equivalents — The carrying amount approximates fair value due to the short-term nature of these instruments. As such, the estimated fair value is classified as Level 1. Interest-bearing Deposits with Banks — The fair value of interest-bearing deposits with banks generally approximates their book value due to their short maturities. In addition, due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2. Resale Agreements — The fair value of resale agreements is estimated by discounting the cash flows based on expected maturities or repricing dates utilizing estimated market discount rates. In addition, due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2. Held-to-Maturity Investment Security — The fair value of the held-to-maturity investment security is determined by the discounted cash flow approach. The discount rate is derived from conditional prepayment rate, constant default rate, loss severity and discount margin. Due to the significant unobservable inputs, the held-to-maturity investment security is classified as Level 3. Available-for-Sale Investment Securities — When available, the Company uses quoted market prices to determine the fair value of available-for-sale investment securities, which are classified as Level 1. Level 1 available-for-sale investment securities are comprised primarily of U.S. Treasury securities. The fair values of other available-for-sale investment securities are generally determined by independent external pricing service providers who have experience in valuing these securities or by the average quoted market prices obtained from independent external brokers. In obtaining such valuation information from third parties, the Company has reviewed the methodologies used to develop the resulting fair values. The available-for-sale investment securities valued using such methods are classified as Level 2. Loans Held-for-Sale — The Company’s loans held-for-sale are carried at the lower of cost or fair value. These loans were mainly comprised of C&I loans as of March 31, 2017 and consumer loans as of December 31, 2016. The fair value of loans held-for-sale is derived from current market prices and comparative current sales. As such, the Company records any fair value adjustments on a nonrecurring basis. Loans held-for-sale are classified as Level 2. Non-PCI Impaired Loans — The fair value of non-PCI impaired loans is measured using the market comparables or discounted cash flow techniques. For CRE loans and C&I loans, the fair value is based on each loan’s observable market price or the fair value of the collateral less cost to sell, if the loan is collateral dependent. The fair value of collateral is generally based on third party appraisals (or internal evaluation if third party appraisal is not required by regulations) which utilize one or more valuation techniques (income, market and/or cost approaches). All third party appraisals and evaluations are reviewed and validated by independent appraisers or the Company’s appraisal department staffed by licensed appraisers and/or experienced real estate reviewers. The third party appraisals are ordered through the appraisal department (except for one-to-four unit residential appraisals which are typically ordered through an approved appraisal management company or an approved residential appraiser) at the inception, renewal or, for all real estate related loans, upon the occurrence of any event causing a downgrade to an adverse grade (i.e., “substandard” or “doubtful”). Updated appraisals and evaluations are generally obtained within the last 12 months . The Company increases the frequency of obtaining updated appraisals for adversely graded credits when declining market conditions exist. All appraisals include an “as is” market value without conditions as of the effective date of the appraisal. For certain impaired loans, the Company utilizes the discounted cash flow approach and applies a discount derived from historical data. The significant unobservable inputs used in the fair value measurement of non-PCI impaired loans are discounts applied based on the liquidation cost of collateral and selling cost. On a quarterly basis, all nonperforming assets are reviewed to assess whether the current carrying value is supported by the collateral or cash flow and to ensure that the current carrying value is appropriate. Non-PCI impaired loans are classified as Level 3. Loans Held-for-Investment, net — The fair value of loans held-for-investment other than Non-PCI impaired loans is determined based on a discounted cash flow approach considered for an exit price value. The discount rate is derived from the associated yield curve plus spreads that reflect the rates in the market for loans with similar financial characteristics. No adjustments have been made for changes in credit within any of the loan portfolios. It is management’s opinion that the allowance for loan losses pertaining to performing and nonperforming loans results in a fair value adjustment of credit for such loans. Due to the unobservable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 3. Other Real Estate Owned — The Company’s OREO represents properties acquired through foreclosure or through full or partial satisfaction of loans held-for-investment, which are recorded at estimated fair value less the cost to sell at the time of foreclosure and at the lower of cost or estimated fair value less the cost to sell subsequent to acquisition. The fair values of OREO properties are based on third party appraisals, broker price opinions or accepted written offers. Please refer to the Non-PCI Impaired Loans section above for a detailed discussion on the Company’s policies and procedures related to appraisals and evaluations. On a monthly basis, the current fair market value of each OREO property is reviewed to ensure that the current carrying value is appropriate. The Company uses the market comparable valuation technique to measure the fair value of OREO properties. The significant unobservable input used is the selling cost. OREO properties are classified as Level 3. Restricted Equity Securities — Restricted equity securities are comprised of FHLB stock and Federal Reserve Bank stock. The carrying amounts of the Company’s restricted equity securities approximate fair value. The valuation of these investments is classified as Level 2. Ownership of these securities is restricted to member banks and the securities do not have a readily determinable fair value. Purchases and sales of these securities are at par value. Accrued Interest Receivable — The carrying amount approximates fair value due to the short-term nature of these instruments. Due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2. Interest Rate Swaps and Options — The Company enters into interest rate swap and option contracts with institutional counterparties to hedge against interest rate swap and option products offered to bank customers. These products allow borrowers to lock in attractive intermediate and long-term interest rates by entering into an interest rate swap or option contract with the Company, resulting in the customer obtaining a synthetic fixed rate loan. The Company also enters into interest rate swap contracts with institutional counterparties to hedge against certificates of deposit issued. This product allows the Company to lock in attractive floating rate funding. The fair value of the interest rate swaps is determined using the market standard methodology of netting the discounted future fixed cash payments (or receipts) and the discounted expected variable cash receipts (or payments). The variable cash receipts (or payments) are based on the expectation of future interest rates (forward curves) derived from observed market interest rate curves. The fair value of the interest rate options, consisting of floors and caps, is determined using the market standard methodology of discounting the future expected cash receipts that would occur if variable interest rates fell below (rise above) the strike rate of the floors (caps). The variable interest rates used in the calculation of projected receipts on the floor (cap) are based on an expectation of future interest rates derived from observable market interest rate curves and volatilities. In addition, to comply with the provisions of ASC 820, the Company incorporates credit valuation adjustments to appropriately reflect both its own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements of its derivatives. The credit valuation adjustments associated with the Company’s derivatives utilize Level 3 inputs, model-derived credit spreads. As of March 31, 2017 , the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of these interest rate contracts’ positions and has determined that the credit valuation adjustments are not significant to the overall valuation of its derivative portfolios. As a result, the Company classifies these derivative valuations in Level 2 of the fair value hierarchy due to the observable nature of the significant inputs utilized. Foreign Exchange Contracts — The Company enters into short-term foreign exchange contracts to purchase/sell foreign currencies at set rates in the future. These contracts economically hedge against foreign exchange rate fluctuations. The Company also enters into contracts with institutional counterparties to hedge against foreign exchange products offered to bank customers. These products allow customers to hedge the foreign exchange risk of their deposits and loans denominated in foreign currencies. The Company assumes minimal foreign exchange rate risk because the contracts with the customer and the institutional party mirror each other. The fair value is determined at each reporting period based on changes in the foreign exchange rate. These are over-the-counter contracts where quoted market prices are not readily available. Valuation is measured using conventional valuation methodologies with observable market data. Valuation depends on the type of derivative and the nature of the underlying rate and contractual terms including period of maturity, price and index upon which the derivative’s value is based. Key inputs include foreign exchange rates (spot and/or forward rates), volatility of currencies, and the correlation of such inputs. The counterparties’ credit risks are considered nominal and resulted in no adjustments to the valuation of the foreign exchange contracts. Due to the observable nature of the inputs used in deriving the fair value of these contracts, the valuation of foreign contracts is classified as Level 2. As of March 31, 2017, foreign exchange forward contracts used to economically hedge the Company’s net investment in East West Bank (China) Limited, a non-U.S. Dollar (“USD”) functional currency subsidiary in China are included in this caption. See Foreign Currency Forward Contracts in the section below for details on valuation methodologies and significant assumptions. Customer Deposits — The fair value of deposits with no stated maturity, such as demand deposits, interest checking, savings and money market deposits, approximates the carrying amount as the amounts are payable on demand at the measurement date. Due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2. For time deposits, the fair value is based on the discounted value of contractual cash flows using current market rates for instruments with similar maturities. Due to the observable nature of the inputs used in deriving the estimated fair value, time deposits are classified as Level 2. Federal Home Loan Bank Advances — The fair value of FHLB advances is estimated based on the discounted value of contractual cash flows, using rates currently offered by the FHLB of San Francisco for advances with similar remaining maturities at each reporting date. Due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2. Repurchase Agreements — The fair value of the repurchase agreements is calculated by discounting future cash flows based on expected maturities or repricing dates, utilizing estimated market discount rates and taking into consideration the call features of each instrument. Due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2. Accrued Interest Payable — The carrying amount approximates fair value due to the short-term nature of these instruments. Due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2. Long-Term Debt — The fair value of long-term debt is estimated by discounting the cash flows through maturity based on current market rates the Company would pay for new issuances. Due to the observable nature of the inputs used in deriving the estimated fair value, long-term debt is classified as Level 2. Foreign Currency Forward Contracts — During the three months ended December 31, 2015, the Company began entering into foreign currency forward contracts to hedge its net investment in East West Bank (China) Limited. Previously, the foreign currency forward contracts or a proportion of the forward contracts were eligible for hedge accounting. During the three months ended March 31, 2017, the foreign currency forward contracts were dedesignated when the hedge relationship ceased to be highly effective. The Company continues to economically hedge its foreign currency exposure resulting from its China subsidiary and the foreign exchange forward contracts are included as part of the “Foreign Exchange Contracts” caption as of March 31, 2017. The fair value of foreign currency forward contracts is valued by comparing the contracted foreign exchange rate to the current market exchange rate. Inputs include spot rates, forward rates, and the interest rate curve of the domestic and foreign currency. Interest rate forward curves are used to determine which forward rate pertains to a specific maturity. Due to the observable nature of the inputs used in deriving the estimated fair value, these instruments are classified as Level 2. Credit Risk Participation Agreements — The Company enters into RPAs, under which the Company assumes its pro-rata share of the credit exposure associated with the borrower’s performance related to interest rate derivative contracts. The fair value of RPAs is calculated by determining the total expected asset or liability exposure of the derivatives to the borrowers and applying the borrowers’ credit spread to that exposure. Total expected exposure incorporates both the current and potential future exposure of the derivatives, derived from using observable inputs, such as yield curves and volatilities. The credit spreads of the borrowers used in the calculation are estimated by the Company based on current market conditions, including consideration of current borrowing spreads for similar customers and transactions, review of existing collateralization or other credit enhancements, and changes in credit sector and entity-specific credit information. The Company has determined that the majority of the inputs used to value RPAs fall within Level 2 of the fair value hierarchy. The fair value estimates presented herein are based on pertinent information available to management as of each reporting date. Although the Company is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since that date, and therefore, current estimates of fair value may differ significantly from the amounts presented herein.

Securities Purchased under Resa

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements	3 Months Ended
	Mar. 31, 2017
Resale and Repurchase Agreements [Abstract]
Securities Purchased under Resale Agreements and Sold under Repurchase Agreements	Note 5 — Securities Purchased under Resale Agreements and Sold under Repurchase Agreements Resale Agreements Resale agreements are recorded at the balances at which the securities were acquired. The market values of the underlying securities collateralizing the related receivable of the resale agreements, including accrued interest, are monitored. Additional collateral may be requested by the Company from the counterparty when deemed appropriate. Gross resale agreements were $1.90 billion and $2.10 billion as of March 31, 2017 and December 31, 2016 , respectively. The weighted average interest rates were 2.15% and 1.84% as of March 31, 2017 and December 31, 2016 , respectively. Repurchase Agreements Long-term repurchase agreements are accounted for as collateralized financing transactions and recorded at the balances at which the securities were sold. The collateral for the repurchase agreements is comprised of U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities, U.S. Treasury securities, and U.S. government agency and U.S. government sponsored enterprise debt securities. The Company may have to provide additional collateral for the repurchase agreements, as necessary. Gross repurchase agreements were $450.0 million as of both March 31, 2017 and December 31, 2016 , respectively. The weighted average interest rates were 3.30% and 3.15% as of March 31, 2017 and December 31, 2016 , respectively. Balance Sheet Offsetting The Company’s resale and repurchase agreements are transacted under legally enforceable master repurchase agreements that provide the Company, in the event of default by the counterparty, the right to liquidate securities held and to offset receivables and payables with the same counterparty. The Company nets resale and repurchase transactions with the same counterparty on the Consolidated Balance Sheets when it has a legally enforceable master netting agreement and the transactions are eligible for netting under ASC 210-20-45. Collateral accepted includes securities that are not recognized on the Consolidated Balance Sheets. Collateral pledged consists of securities that are not netted on the Consolidated Balance Sheets against the related collateralized liability. Collateral accepted or pledged in resale and repurchase agreements with other financial institutions may also be sold or re-pledged by the secured party, but is usually delivered to and held by the third party trustees. The collateral amounts received/posted are limited for presentation purposes to the related recognized asset/liability balance for each counterparty, and accordingly, do not include excess collateral received/pledged. The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 : ($ in thousands) As of March 31, 2017 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Financial Collateral Net Amount Resale agreements $ 1,900,000 $ (250,000 ) $ 1,650,000 $ (150,000 ) (1) $ (1,488,939 ) (2) $ 11,061 Gross Amounts Gross Amounts Net Amounts of on the Gross Amounts Not Offset on the Liabilities Financial Collateral Net Amount Repurchase agreements $ 450,000 $ (250,000 ) $ 200,000 $ (150,000 ) (1) $ (50,000 ) (3) $ — ($ in thousands) As of December 31, 2016 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Financial Collateral Net Amount Resale agreements $ 2,100,000 $ (100,000 ) $ 2,000,000 $ (150,000 ) (1) $ (1,839,120 ) (2) $ 10,880 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Liabilities Financial Collateral Net Amount Repurchase agreements $ 450,000 $ (100,000 ) $ 350,000 $ (150,000 ) (1) $ (200,000 ) (3) $ — (1) Represents financial instruments subject to enforceable master netting arrangements that are not eligible to be offset under ASC 210-20-45 but would be eligible for offsetting to the extent that an event of default has occurred. (2) Represents the fair value of securities the Company has received under resale agreements, limited for table presentation purposes to the amount of the recognized asset due from each counterparty. (3) Represents the fair value of securities the Company has pledged under repurchase agreements, limited for table presentation purposes to the amount of the recognized liability owed to each counterparty. In addition to the amounts included in the tables above, the Company also has balance sheet netting related to derivatives, refer to Note 7 — Derivatives to the Consolidated Financial Statements for additional information.

Securities

Securities	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Securities	Note 6 — Securities The following tables present as of March 31, 2017 and December 31, 2016 the amortized cost, gross unrealized gains and losses and fair value by major categories of available-for-sale investment securities, which are carried at fair value, and the held-to-maturity investment security, which is carried at amortized cost: As of March 31, 2017 ($ in thousands) Amortized Gross Gross Fair Available-for-sale investment securities: U.S. Treasury securities $ 709,332 $ 10 $ (8,482 ) $ 700,860 U.S. government agency and U.S. government sponsored enterprise debt securities 183,605 134 (2,876 ) 180,863 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 271,025 337 (6,840 ) 264,522 Residential mortgage-backed securities 1,185,382 3,855 (9,482 ) 1,179,755 Municipal securities 146,559 1,909 (1,399 ) 147,069 Non-agency residential mortgage-backed securities: Investment grade (1) 10,837 — (107 ) 10,730 Corporate debt securities: Investment grade (1) 2,476 — (222 ) 2,254 Non-investment grade (1) 10,191 — (1,007 ) 9,184 Foreign bonds: Investment grade (1) (2) 445,433 49 (19,614 ) 425,868 Other securities 40,593 853 (517 ) 40,929 Total available-for-sale investment securities $ 3,005,433 $ 7,147 $ (50,546 ) $ 2,962,034 Held-to-maturity investment security: Non-agency commercial mortgage-backed security $ 132,497 $ 1,159 $ — $ 133,656 Total investment securities $ 3,137,930 $ 8,306 $ (50,546 ) $ 3,095,690 As of December 31, 2016 ($ in thousands) Amortized Gross Gross Fair Available-for-sale investment securities: U.S. Treasury securities $ 730,287 $ 21 $ (9,829 ) $ 720,479 U.S. government agency and U.S. government sponsored enterprise debt securities 277,891 224 (3,249 ) 274,866 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 272,672 345 (6,218 ) 266,799 Residential mortgage-backed securities 1,266,372 3,924 (11,549 ) 1,258,747 Municipal securities 148,302 1,252 (1,900 ) 147,654 Non-agency residential mortgage-backed securities: Investment grade (1) 11,592 — (115 ) 11,477 Corporate debt securities: Investment grade (1) 222,190 562 (375 ) 222,377 Non-investment grade (1) 10,191 — (1,018 ) 9,173 Foreign bonds: Investment grade (1) (2) 405,443 30 (21,579 ) 383,894 Other securities 40,501 337 (509 ) 40,329 Total available-for-sale investment securities $ 3,385,441 $ 6,695 $ (56,341 ) $ 3,335,795 Held-to-maturity investment security: Non-agency commercial mortgage-backed security $ 143,971 $ 622 $ — $ 144,593 Total investment securities $ 3,529,412 $ 7,317 $ (56,341 ) $ 3,480,388 (1) Available-for-sale investment securities rated BBB- or higher by S&P or Baa3 or higher by Moody’s are considered investment grade. Conversely, available-for-sale investment securities rated lower than BBB- by S&P or lower than Baa3 by Moody’s are considered non-investment grade. Classifications are based on the lower of the credit ratings by S&P or Moody’s. (2) Fair values of foreign bonds include $395.5 million and $353.6 million of multilateral development bank bonds as of March 31, 2017 and December 31, 2016 , respectively. Unrealized Losses The following tables present as of March 31, 2017 and December 31, 2016 the Company’s investment portfolio’s gross unrealized losses and related fair values, aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position: As of March 31, 2017 ($ in thousands) Less Than 12 Months 12 Months or More Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-sale investment securities: U.S. Treasury securities $ 680,801 $ (8,482 ) $ — $ — $ 680,801 $ (8,482 ) U.S. government agency and U.S. government sponsored enterprise debt securities 154,847 (2,876 ) — — 154,847 (2,876 ) U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 212,706 (5,879 ) 35,193 (961 ) 247,899 (6,840 ) Residential mortgage-backed securities 598,526 (8,151 ) 132,328 (1,331 ) 730,854 (9,482 ) Municipal securities 45,327 (1,006 ) 6,925 (393 ) 52,252 (1,399 ) Non-agency residential mortgage-backed securities: Investment grade 10,729 (107 ) — — 10,729 (107 ) Corporate debt securities: Investment grade — — 2,254 (222 ) 2,254 (222 ) Non-investment grade — — 9,184 (1,007 ) 9,184 (1,007 ) Foreign bonds: Investment grade 380,530 (19,409 ) 9,795 (205 ) 390,325 (19,614 ) Other securities 31,013 (517 ) — — 31,013 (517 ) Total available-for-sale investment securities $ 2,114,479 $ (46,427 ) $ 195,679 $ (4,119 ) $ 2,310,158 $ (50,546 ) Held-to-maturity investment security: Non-agency commercial mortgage-backed security $ — $ — $ — $ — $ — $ — Total investment securities $ 2,114,479 $ (46,427 ) $ 195,679 $ (4,119 ) $ 2,310,158 $ (50,546 ) As of December 31, 2016 ($ in thousands) Less Than 12 Months 12 Months or More Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-sale investment securities: U.S. Treasury securities $ 670,268 $ (9,829 ) $ — $ — $ 670,268 $ (9,829 ) U.S. government agency and U.S. government sponsored enterprise debt securities 203,901 (3,249 ) — — 203,901 (3,249 ) U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 202,106 (5,452 ) 29,201 (766 ) 231,307 (6,218 ) Residential mortgage-backed securities 629,324 (9,594 ) 119,603 (1,955 ) 748,927 (11,549 ) Municipal securities 57,655 (1,699 ) 2,692 (201 ) 60,347 (1,900 ) Non-agency residential mortgage-backed securities: Investment grade 5,033 (101 ) 6,444 (14 ) 11,477 (115 ) Corporate debt securities: Investment grade — — 71,667 (375 ) 71,667 (375 ) Non-investment grade — — 9,173 (1,018 ) 9,173 (1,018 ) Foreign bonds: Investment grade 363,618 (21,327 ) 14,258 (252 ) 377,876 (21,579 ) Other securities 30,991 (509 ) — — 30,991 (509 ) Total available-for-sale investment securities $ 2,162,896 $ (51,760 ) $ 253,038 $ (4,581 ) $ 2,415,934 $ (56,341 ) Held-to-maturity investment security: Non-agency commercial mortgage-backed security $ — $ — $ — $ — $ — $ — Total investment securities $ 2,162,896 $ (51,760 ) $ 253,038 $ (4,581 ) $ 2,415,934 $ (56,341 ) For each reporting period, the Company examines all individual securities that are in an unrealized loss position for OTTI. For discussion of the factors and criteria the Company uses in analyzing securities for OTTI, see Note 1 — Summary of Significant Accounting Policies — Available-for-Sale Investment Securities t o the Consolidated Financial Statements of the Company’s 2016 Form 10-K. The unrealized losses were primarily attributed to the yield curve movement, in addition to widened liquidity and credit spreads. The issuers of these securities have not, to the Company’s knowledge, established any cause for default on these securities. These securities have fluctuated in value since their purchase dates as market interest rates have fluctuated. The Company believes that the gross unrealized losses detailed in the previous tables are temporary and not due to reasons of credit quality. As a result, the Company expects to recover the entire amortized cost basis of these securities. Accordingly, no impairment loss has been recorded on the Company’s Consolidated Statements of Income for the three months ended March 31, 2017 and 2016 . As of March 31, 2017 , the Company had 163 available-for-sale investment securities in an unrealized loss position with no credit impairment, primarily comprised of 13 investment grade foreign bonds, 83 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities and 27 U.S. Treasury securities. In comparison, the Company had 170 available-for-sale investment securities in an unrealized loss position with no credit impairment, primarily comprised of 13 investment grade foreign bonds, 82 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities and 26 U.S. Treasury securities as of December 31, 2016 . During the first quarter of 2016, the Company obtained a non-agency mortgage-backed investment security, through the securitization of multifamily real estate loans, which was classified as held-to-maturity and recorded at amortized cost. The Company has the intent and ability to hold the security to maturity. OTTI No OTTI credit losses were recognized for the three months ended March 31, 2017 and 2016 . Realized Gains and Losses The following table presents the proceeds, gross realized gains and losses, and tax expense related to the sales of available-for-sale investment securities for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 2016 Proceeds from sales $ 302,656 $ 652,753 Gross realized gains $ 2,474 $ 3,967 Gross realized losses $ — $ 125 Related tax expense $ 1,040 $ 1,616 Scheduled Maturities of Investment Securities The following table presents the scheduled maturities of available-for-sale investment securities as of March 31, 2017 : ($ in thousands) Amortized Cost Estimated Fair Value Due within one year $ 519,223 $ 503,271 Due after one year through five years 878,436 867,870 Due after five years through ten years 241,665 236,183 Due after ten years 1,366,109 1,354,710 Total available-for-sale investment securities $ 3,005,433 $ 2,962,034 The following table presents the scheduled maturity of the held-to-maturity investment security as of March 31, 2017 : ($ in thousands) Amortized Cost Estimated Fair Value Due after ten years $ 132,497 $ 133,656 Actual maturities of mortgage-backed securities can differ from contractual maturities because borrowers have the right to prepay obligations. In addition, factors such as prepayments and interest rates may affect the yields on the carrying values of mortgage-backed securities. Available-for-sale investment securities with fair values of $640.9 million and $767.4 million as of March 31, 2017 and December 31, 2016 , respectively, were pledged to secure public deposits, repurchase agreements, the Federal Reserve Bank’s discount window, and for other purposes required or permitted by law. Restricted Equity Securities Restricted equity securities include stock of the Federal Reserve Bank and the Federal Home Loan Bank. Restricted equity securities are carried at cost as these securities do not have a readily determined fair value because ownership of these shares is restricted and they lack a market. The following table presents the restricted equity securities as of March 31, 2017 and December 31, 2016 : ($ in thousands) March 31, 2017 December 31, 2016 Federal Reserve Bank stock $ 17,250 $ 17,250 FHLB stock 55,769 55,525 Total $ 73,019 $ 72,775

Derivatives

Derivatives	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Note 7 — Derivatives The Company uses derivatives to manage exposure to market risk, including interest rate risk and foreign currency risk and to assist customers with their risk management objectives. The Company’s goal is to manage interest rate sensitivity and volatility so that movements in interest rates are not significant to earnings or capital. The Company also uses foreign exchange contracts to manage the foreign exchange risk associated with certain foreign currency-denominated assets and liabilities, as well as the Company’s investment in its China subsidiary, East West Bank (China) Limited. The Company recognizes all derivatives on the Consolidated Balance Sheets at fair value. While the Company designates certain derivatives as hedging instruments in a qualifying hedge accounting relationship, other derivatives consist of economic hedges. For additional information on the Company’s derivatives and hedging activities, see Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements of the Company’s 2016 Form 10-K. The following table presents the total notional and fair values of the Company’s derivatives as of March 31, 2017 and December 31, 2016 : ($ in thousands) March 31, 2017 December 31, 2016 Notional Amount Fair Value Notional Amount Fair Value Derivative Assets (1) Derivative Liabilities (1) Derivative Assets (1) Derivative Liabilities (1) Derivatives designated as hedging instruments: Interest rate swaps on certificates of deposit $ 48,365 $ — $ 6,793 $ 48,365 $ — $ 5,976 Foreign currency forward contracts — — — 83,026 4,325 — Total derivatives designated as hedging instruments $ 48,365 $ — $ 6,793 $ 131,391 $ 4,325 $ 5,976 Derivatives not designated as hedging instruments: Interest rate swaps and options $ 7,831,456 $ 61,586 $ 60,204 $ 7,668,482 $ 67,578 $ 65,131 Foreign exchange contracts 1,267,282 8,220 7,357 767,764 11,874 11,213 RPAs 71,396 3 2 71,414 3 3 Total derivatives not designated as hedging instruments $ 9,170,134 $ 69,809 $ 67,563 $ 8,507,660 $ 79,455 $ 76,347 (1) Derivative assets and derivative liabilities are included in Other assets and Accrued expenses and other liabilities, respectively, on the Consolidated Balance Sheets. Derivatives Designated as Hedging Instruments Interest Rate Swaps on Certificates of Deposit — The Company is exposed to changes in the fair value of certain fixed rate certificates of deposit due to changes in the benchmark interest rate, London Interbank Offered Rate. Interest rate swaps designated as fair value hedges involve the receipt of fixed rate amounts from a counterparty in exchange for the Company making variable rate payments over the life of the agreements without the exchange of the underlying notional amount. As of each of March 31, 2017 and December 31, 2016 , the total notional amount of the interest rate swaps on certificates of deposit was $48.4 million . The fair value liabilities of the interest rate swaps were $6.8 million and $6.0 million as of March 31, 2017 and December 31, 2016 , respectively. The following table presents the net (losses) gains recognized on the Consolidated Statements of Income related to the derivatives designated as fair value hedges for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended 2017 2016 (Losses) gains recorded in interest expense: Recognized on interest rate swaps $ (817 ) $ 4,229 Recognized on certificates of deposit $ 688 $ (3,356 ) Net Investment Hedges — ASC 830-20, Foreign Currency Matters — Foreign Currency Transactions and ASC 815, Derivatives and Hedging, allow hedging of the foreign currency risk of a net investment in a foreign operation. During the fourth quarter of 2015, the Company began entering into foreign currency forward contracts to hedge its investment in East West Bank (China) Limited, a non-USD functional currency subsidiary in China. The hedging instruments designated as net investment hedges, involve hedging the risk of changes in the USD equivalent value of a designated monetary amount of the Company’s net investment in China, against the risk of adverse changes in the foreign currency exchange rate. The Company recorded the changes in the carrying amount of its China subsidiary in the Foreign currency translation adjustment account within AOCI. Simultaneously, the effective portion of the hedge of this exposure was also recorded in the Foreign Currency Translation Adjustment account and the ineffective portion, if any, was recorded in current earnings. During the three months ended March 31, 2017 , the Company discontinued hedge accounting prospectively. The cumulative effective portion of the net investment hedges recorded through the point of dedesignation will remain in the Foreign currency translation adjustment account within AOCI, and reclassified into earnings only upon the sale or liquidation of the China subsidiary. The Company continues to economically hedge its foreign currency exposure in its China subsidiary and the foreign exchange forward contracts are included as part of the Derivatives Not Designated as Hedging Instruments — “Foreign Exchange Contracts” caption as of March 31, 2017. As of March 31, 2017 , there were no derivative contracts designated as net investment hedges. As of December 31, 2016 , the total notional amount and fair value of the foreign currency forward contracts designated as net investment hedges were $83.0 million and a $4.3 million asset, respectively. The following table presents the losses recorded in the Foreign currency translation adjustment account within AOCI related to the effective portion of the net investment hedges and the ineffectiveness recorded on the Consolidated Statements of Income for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended 2017 2016 Losses recognized in AOCI on net investment hedges (effective portion) $ 648 $ 1,485 Losses recognized in foreign exchange income (ineffective portion) $ 1,953 $ 880 Derivatives Not Designated as Hedging Instruments Interest Rate Swaps and Options — The Company enters into interest rate derivatives including interest rate swaps and options with its customers to allow them to hedge against the risk of rising interest rates on their variable rate loans. To economically hedge against the interest rate risks in the products offered to its customers, the Company enters into mirrored interest rate contracts with institutional counterparties. As of March 31, 2017 , the total notional amounts of interest rate swaps and options, including mirrored transactions with institutional counterparties and the Company’s customers totaled $3.92 billion for derivatives that were in an asset valuation position and $3.91 billion for derivatives that were in a liability valuation position. As of December 31, 2016 , the total notional amounts of interest rate swaps and options, including mirrored transactions with institutional counterparties and the Company’s customers totaled $3.86 billion for derivatives that were in an asset valuation position and $3.81 billion for derivatives that were in a liability valuation position. The fair values of interest rate swap and option contracts with institutional counterparties and the Company’s customers amounted to a $61.6 million asset and a $60.2 million liability as of March 31, 2017 . The fair values of interest rate swap and option contracts with institutional counterparties and the Company’s customers amounted to a $67.6 million asset and a $65.1 million liability as of December 31, 2016 . Foreign Exchange Contracts — The Company enters into foreign exchange contracts on a regular basis, primarily comprised of forward and swap contracts to economically hedge foreign exchange rate fluctuations. A majority of these contracts have original maturities of one year or less. As of March 31, 2017 and December 31, 2016 , the total notional amounts of the foreign exchange contracts were $1.27 billion and $767.8 million , respectively. The fair values of the foreign exchange contracts recorded were an $8.2 million asset and a $7.4 million liability as of March 31, 2017 . The fair values of the short-term foreign exchange contracts recorded were an $11.9 million asset and an $11.2 million liability as of December 31, 2016 . Credit Risk Participation Agreements — The Company has entered into RPAs under which the Company assumed its pro-rata share of the credit exposure associated with the borrower’s performance related to interest rate derivative contracts. The Company may or may not be a party to the interest rate derivative contract and enters into such RPAs in instances where the Company is a party to the related loan participation agreement with the borrower. The Company will make/receive payments under the RPAs if the borrower defaults on its obligation to perform under the interest rate derivative contract. The Company manages its credit risk on the RPAs by monitoring the credit worthiness of the borrowers, which is based on the normal credit review process. The notional amounts of the RPAs reflect the Company’s pro-rata share of the derivative instrument. As of March 31, 2017 , the notional amount and the fair value of RPAs purchased were approximately $49.1 million and a $2 thousand liability, respectively. As of March 31, 2017 , the notional amount and fair value of the RPAs sold were approximately $22.3 million and a $3 thousand asset, respectively. As of December 31, 2016 , the notional amount and the fair value of RPAs purchased were approximately $48.3 million and a $3 thousand liability, respectively. As of December 31, 2016 , the notional amount and the fair value of the RPA sold was approximately $23.1 million and a $3 thousand asset, respectively. Assuming all underlying borrowers referenced in the interest rate derivative contracts defaulted as of March 31, 2017 and December 31, 2016 , the exposures from the RPAs purchased would be $112 thousand and $179 thousand , respectively. As of March 31, 2017 and December 31, 2016 , the weighted average remaining maturities of the outstanding RPAs were 3.5 years and 3.7 years , respectively. The following table presents the net gains (losses) recognized on the Company’s Consolidated Statements of Income related to derivatives not designated as hedging instruments for the three months ended March 31, 2017 and 2016 : ($ in thousands) Location in Consolidated Statements of Income Three Months Ended 2017 2016 Derivatives not designated as hedging instruments: Interest rate swaps and options Derivative fees and other income $ (1,066 ) $ (711 ) Foreign exchange contracts Foreign exchange income 5,838 2,828 RPAs Derivative fees and other income 1 (11 ) Net gains $ 4,773 $ 2,106 Credit-Risk-Related Contingent Features — Certain over-the-counter derivative contracts of the Company contain early termination provisions that may require the Company to settle any outstanding balances upon the occurrence of a specified credit-risk-related event. These events, which are defined by the existing derivative contracts, primarily relate to a downgrade in the credit rating of East West Bank to below investment grade. In the event that East West Bank’s credit rating is downgraded to below investment grade, no additional collateral would be required to be posted, since the liabilities related to such contracts were fully collateralized as of March 31, 2017 and December 31, 2016 . Offsetting of Derivatives The Company has entered into agreements with certain counterparty financial institutions, which include master netting agreements. However, the Company has elected to account for all derivatives with counterparty institutions on a gross basis. The following tables present gross derivatives on the Consolidated Balance Sheets and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities and/or cash. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability (after netting is applied); thus instances of overcollateralization are not shown: ($ in thousands) As of March 31, 2017 Total Contracts Not Subject to Master Netting Arrangements Contracts Subject to Master Netting Arrangements Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts Net Amounts Gross Amounts Not Offset on the Derivative Amount Collateral Net Amount Derivatives Assets $ 69,809 $ 44,570 $ 25,239 $ — $ 25,239 $ (20,964 ) (1) $ (4,162 ) (2) $ 113 Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts Net Amounts Gross Amounts Not Offset on the Derivative Amount Collateral Net Amount Derivatives Liabilities $ 74,356 $ 22,699 $ 51,657 $ — $ 51,657 $ (20,964 ) (1) $ (29,833 ) (3) $ 860 ($ in thousands) As of December 31, 2016 Total Contracts Not Subject to Master Netting Arrangements Contracts Subject to Master Netting Arrangements Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts Offset on the Consolidated Balance Sheets Net Amounts Gross Amounts Not Offset on the Derivative Collateral Net Amount Derivatives Assets $ 83,780 $ 51,218 $ 32,562 $ — $ 32,562 $ (20,991 ) (1) $ (10,687 ) (2) $ 884 Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts Offset on the Consolidated Balance Sheets Net Amounts Gross Amounts Not Offset on the Derivative Collateral Net Amount Derivatives Liabilities $ 82,323 $ 24,097 $ 58,226 $ — $ 58,226 $ (20,991 ) (1) $ (36,349 ) (3) $ 886 (1) Represents the netting of derivative receivable and payable balances for the same counterparty under enforceable master netting arrangements if the Company has elected to net. (2) Represents $1.0 million and $8.1 million of cash collateral received against derivative assets with the same counterparty that are subject to enforceable master netting arrangements as of March 31, 2017 and December 31, 2016 , respectively. (3) Represents cash and securities pledged against derivative liabilities with the same counterparty that are subject to enforceable master netting arrangements. Includes approximately $1.2 million and $170 thousand of cash collateral posted as of March 31, 2017 and December 31, 2016 , respectively. In addition to the amounts included in the table above, the Company also has balance sheet netting related to resale and repurchase agreements, refer to Note 5 — Securities Purchased under Resale Agreements and Sold under Repurchase Agreements to the Consolidated Financial Statements for additional information. Refer to Note 4 — Fair Value Measurement and Fair Value of Financial Instruments to the Consolidated Financial Statements for fair value measurement disclosures on derivatives.

Loans Receivable and Allowance

Loans Receivable and Allowance for Credit Losses	3 Months Ended
	Mar. 31, 2017
Loans and Leases Receivable Disclosure [Abstract]
Loans Receivable and Allowance for Credit Losses	Note 8 — Loans Receivable and Allowance for Credit Losses The Company’s held-for-investment loan portfolio includes originated and purchased loans. Originated and purchased loans with no evidence of credit deterioration at their acquisition date are referred to collectively as non-PCI loans. PCI loans are loans acquired with evidence of credit deterioration since their origination and it is probable at the acquisition date that the Company would be unable to collect all contractually required payments. PCI loans are accounted for under ASC Subtopic 310-30, Loans and Debt Securities Acquired with Deteriorated Credit Quality . The Company has elected to account for PCI loans on a pool level basis under ASC 310-30 at the time of acquisition. The following table presents the composition of the Company’s non-PCI and PCI loans as of March 31, 2017 and December 31, 2016 : ($ in thousands) March 31, 2017 December 31, 2016 Non-PCI Loans (1) PCI Loans (2) Total (1)(2) Non-PCI Loans (1) PCI Loans (2) Total (1)(2) CRE: Income producing $ 7,964,224 $ 337,874 $ 8,302,098 $ 7,667,661 $ 348,448 $ 8,016,109 Construction 562,560 — 562,560 551,560 — 551,560 Land 120,885 1,347 122,232 121,276 1,918 123,194 Total CRE 8,647,669 339,221 8,986,890 8,340,497 350,366 8,690,863 C&I: Commercial business 9,176,747 32,110 9,208,857 8,921,246 38,387 8,959,633 Trade finance 709,215 — 709,215 680,930 — 680,930 Total C&I 9,885,962 32,110 9,918,072 9,602,176 38,387 9,640,563 Residential: Single-family 3,566,739 133,333 3,700,072 3,370,669 139,110 3,509,779 Multifamily 1,643,167 89,528 1,732,695 1,490,285 95,654 1,585,939 Total residential 5,209,906 222,861 5,432,767 4,860,954 234,764 5,095,718 Consumer 2,106,091 17,472 2,123,563 2,057,067 18,928 2,075,995 Total loans held-for-investment $ 25,849,628 $ 611,664 $ 26,461,292 $ 24,860,694 $ 642,445 $ 25,503,139 Allowance for loan losses (263,007 ) (87 ) (263,094 ) (260,402 ) (118 ) (260,520 ) Loans held-for-investment, net $ 25,586,621 $ 611,577 $ 26,198,198 $ 24,600,292 $ 642,327 $ 25,242,619 (1) Includes $(4.7) million and $1.2 million as of March 31, 2017 and December 31, 2016 , respectively, of net deferred loan fees, unamortized premiums and unaccreted discounts. (2) Loans net of ASC 310-30 discount. CRE loans include income producing real estate, construction and land loans where the interest rates may be fixed, variable or hybrid. Included in CRE loans are owner occupied CRE loans, and also non-owner occupied CRE loans where the borrowers rely on income from tenants to service the loan. Commercial business and trade finance in the C&I segment provide financing to businesses in a wide spectrum of industries. Residential loans are comprised of single-family and multifamily loans. The Company offers first lien mortgage loans secured by one-to-four unit residential properties located in its primary lending areas. The Company offers a variety of first lien mortgage loan programs, including fixed rate conforming loans and adjustable rate mortgage loans with initial fixed periods of one to five years, which adjust annually thereafter. Consumer loans are comprised of home equity lines of credit (“HELOCs”), insurance premium financing loans, credit card and auto loans. As of March 31, 2017 and December 31, 2016 , the Company’s HELOCs are the largest component of the consumer loan portfolio, and are secured by one-to-four unit residential properties located in its primary lending areas. The HELOCs loan portfolio is largely comprised of loans originated through a reduced documentation loan program, where a substantial down payment is required, resulting in a low loan-to-value ratio, typically 60% or less at origination. The Company is in a first lien position for many of these reduced documentation HELOCs. These loans have historically experienced low delinquency and default rates. All loans originated are subject to the Company’s underwriting guidelines and loan origination standards. Management believes that the Company’s underwriting criteria and procedures adequately consider the unique risks which may come from these products. The Company conducts a variety of quality control procedures and periodic audits, including review of criteria for lending and legal requirements, to ensure it is in compliance with its origination standards. As of March 31, 2017 and December 31, 2016 , loans totaling $17.16 billion and $16.44 billion , respectively, were pledged to secure borrowings and to provide additional borrowing capacity from the FHLB and the Federal Reserve Bank. Credit Quality Indicators All loans are subject to the Company’s internal and external credit review and monitoring. Loans are risk rated based on an analysis of the current state of the borrower’s credit quality. The analysis of credit quality includes a review of all repayment sources, the borrower’s current payment performance/delinquency, current financial and liquidity status and all other relevant information. For single-family residential loans, payment performance/delinquency is the driving indicator for the risk ratings. Risk ratings are the overall credit quality indicator for the Company and the credit quality indicator utilized for estimating the appropriate allowance for loan losses. The Company utilizes a risk rating system, which can be classified within the following categories: Pass, Watch, Special Mention, Substandard, Doubtful and Loss. The risk ratings reflect the relative strength of the repayment sources. Pass and Watch loans are generally considered to have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special Mention loans are considered to have potential weaknesses that warrant closer attention by management. Special Mention is considered a transitory grade. If potential weaknesses are resolved, the loan is upgraded to a Pass or Watch grade. If negative trends in the borrower’s financial status or other information indicate that the repayment sources may become inadequate, the loan is downgraded to a Substandard grade. Substandard loans are considered to have well-defined weaknesses that jeopardize the full and timely repayment of the loan. Substandard loans have a distinct possibility of loss, if the deficiencies are not corrected. Additionally, when management has assessed a potential for loss but a distinct possibility of loss is not recognizable, the loan is still classified as Substandard. Doubtful loans have insufficient sources of repayment and a high probability of loss. Loss loans are considered to be uncollectible and of such little value that they are no longer considered bankable assets. These internal risk ratings are reviewed routinely and adjusted based on changes in the borrowers’ financial status and the loans’ collectability. The following tables present the credit risk rating for non-PCI loans by portfolio segment as of March 31, 2017 and December 31, 2016 : March 31, 2017 ($ in thousands) Pass/Watch Special Mention Substandard Doubtful Loss Total CRE: Income producing $ 7,800,487 $ 23,362 $ 140,375 $ — $ — $ 7,964,224 Construction 530,278 32,282 — — — 562,560 Land 109,013 — 11,872 — — 120,885 C&I: Commercial business 8,827,318 139,251 185,249 24,929 — 9,176,747 Trade finance 677,654 3,566 27,995 — — 709,215 Residential: Single-family 3,533,047 8,693 24,999 — — 3,566,739 Multifamily 1,619,193 1,284 22,690 — — 1,643,167 Consumer 2,087,485 6,907 11,699 — — 2,106,091 Total $ 25,184,475 $ 215,345 $ 424,879 $ 24,929 $ — $ 25,849,628 December 31, 2016 ($ in thousands) Pass/Watch Special Mention Substandard Doubtful Loss Total Non-PCI Loans CRE: Income producing $ 7,476,804 $ 29,005 $ 161,852 $ — $ — $ 7,667,661 Construction 551,560 — — — — 551,560 Land 107,976 — 13,290 10 — 121,276 C&I: Commercial business 8,559,674 155,276 201,139 5,157 — 8,921,246 Trade finance 635,027 9,435 36,460 — 8 680,930 Residential: Single-family 3,341,015 10,179 19,475 — — 3,370,669 Multifamily 1,462,522 2,268 25,495 — — 1,490,285 Consumer 2,043,405 6,764 6,898 — — 2,057,067 Total $ 24,177,983 $ 212,927 $ 464,609 $ 5,167 $ 8 $ 24,860,694 The following tables present the credit risk rating for PCI loans by portfolio segment as of March 31, 2017 and December 31, 2016 : March 31, 2017 ($ in thousands) Pass/Watch Special Mention Substandard Total PCI Loans CRE: Income producing $ 282,099 $ 573 $ 55,202 $ 337,874 Land 1,012 — 335 1,347 C&I: Commercial business 27,884 680 3,546 32,110 Residential: Single-family 130,031 1,522 1,780 133,333 Multifamily 80,510 — 9,018 89,528 Consumer 15,559 374 1,539 17,472 Total (1) $ 537,095 $ 3,149 $ 71,420 $ 611,664 December 31, 2016 ($ in thousands) Pass/Watch Special Mention Substandard Total PCI Loans CRE: Income producing $ 293,529 $ 3,239 $ 51,680 $ 348,448 Land 1,562 — 356 1,918 C&I: Commercial business 33,885 772 3,730 38,387 Residential: Single-family 136,245 1,239 1,626 139,110 Multifamily 86,190 — 9,464 95,654 Consumer 17,433 316 1,179 18,928 Total (1) $ 568,844 $ 5,566 $ 68,035 $ 642,445 (1) Loans net of ASC 310-30 discount. Nonaccrual and Past Due Loans Non-PCI loans that are 90 or more days past due are generally placed on nonaccrual status. Additionally, non-PCI loans that are not 90 or more days past due but have identified deficiencies, such as when the full collection of principal or interest becomes uncertain, are also placed on nonaccrual status. The following tables present the aging analysis on non-PCI loans as of March 31, 2017 and December 31, 2016 : March 31, 2017 ($ in thousands) Accruing Loans 30-59 Days Past Due Accruing Loans 60-89 Days Past Due Total Accruing Past Due Loans Nonaccrual Loans Less Than 90 Days Past Due Nonaccrual Loans 90 or More Days Past Due Total Nonaccrual Loans Current Accruing Loans Total Non-PCI Loans CRE: Income producing $ 3,132 $ — $ 3,132 $ 11,596 $ 22,120 $ 33,716 $ 7,927,376 $ 7,964,224 Construction — — — — — — 562,560 562,560 Land — — — 47 4,453 4,500 116,385 120,885 C&I: Commercial business 8,478 5 8,483 47,238 44,855 92,093 9,076,171 9,176,747 Trade finance — — — — — — 709,215 709,215 Residential: Single-family 2,211 5,246 7,457 — 5,643 5,643 3,553,639 3,566,739 Multifamily 4,801 904 5,705 1,030 1,192 2,222 1,635,240 1,643,167 Consumer 3,352 444 3,796 156 2,825 2,981 2,099,314 2,106,091 Total $ 21,974 $ 6,599 $ 28,573 $ 60,067 $ 81,088 $ 141,155 $ 25,679,900 $ 25,849,628 December 31, 2016 ($ in thousands) Accruing Loans 30-59 Days Past Due Accruing Loans 60-89 Days Past Due Total Accruing Past Due Loans Nonaccrual Loans Less Than 90 Days Past Due Nonaccrual Loans 90 or More Days Past Due Total Nonaccrual Loans Current Accruing Loans Total CRE: Income producing $ 6,233 $ 14,080 $ 20,313 $ 14,872 $ 12,035 $ 26,907 $ 7,620,441 $ 7,667,661 Construction 4,994 — 4,994 — — — 546,566 551,560 Land — — — 433 4,893 5,326 115,950 121,276 C&I: Commercial business 45,052 2,279 47,331 60,511 20,737 81,248 8,792,667 8,921,246 Trade finance — — — 8 — 8 680,922 680,930 Residential: Single-family 9,595 8,076 17,671 — 4,214 4,214 3,348,784 3,370,669 Multifamily 3,951 374 4,325 2,790 194 2,984 1,482,976 1,490,285 Consumer 3,327 3,228 6,555 165 1,965 2,130 2,048,382 2,057,067 Total $ 73,152 $ 28,037 $ 101,189 $ 78,779 $ 44,038 $ 122,817 $ 24,636,688 $ 24,860,694 For information on the policy for recording payments received and resuming accrual of interest on non-PCI loans that are placed on nonaccrual status, see Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements of the Company’s 2016 Form 10-K. PCI loans are excluded from the above aging analysis tables as the Company has elected to account for these loans on a pool level basis under ASC 310-30 at the time of acquisition. Please refer to the discussion on PCI loans within this note for additional details on interest income recognition. As of March 31, 2017 and December 31, 2016 , PCI loans on nonaccrual status totaled $12.0 million and $11.7 million , respectively. Loans in Process of Foreclosure As of March 31, 2017 and December 31, 2016 , the Company had $944 thousand and $3.1 million , respectively, of recorded investment in residential and consumer mortgage loans secured by residential real estate properties, for which formal foreclosure proceedings were in process according to local requirements of the applicable jurisdictions, which were not included in OREO. No foreclosed residential real estate properties were included in total net OREO of $3.6 million as of March 31, 2017 . In comparison, foreclosed residential real estate properties with a carrying amount of $401 thousand were included in total net OREO of $6.7 million as of December 31, 2016 . Troubled Debt Restructurings (“TDRs”) Potential TDRs are individually evaluated and the type of restructuring is selected based on the loan type and the circumstances of the borrower’s financial difficulty in order to maximize the Company’s recovery. A TDR is a modification of the terms of a loan when the Company, for economic or legal reasons related to the borrower’s financial difficulties, grants a concession to the borrower, it would not otherwise consider. The following table presents the additions to non-PCI TDRs for the three months ended March 31, 2017 and 2016 : Loans Modified as TDRs During the Three Months Ended March 31, ($ in thousands) 2017 2016 Number Pre- Modification Post- Modification (1) Financial (2) Number Pre- Modification Post- Modification (1) Financial (2) CRE: Income producing 1 $ 1,526 $ 1,505 $ — 2 $ 13,775 $ 13,758 $ — Land 2 $ 86 $ — $ — — $ — $ — $ — C&I: Commercial business 2 $ 6,448 $ 4,914 $ 1,273 4 $ 21,614 $ 18,577 $ 97 Trade finance — $ — $ — $ — 2 $ 7,901 $ 8,082 $ — Residential: Single-family — $ — $ — $ — 1 $ 276 $ 272 $ — Consumer — $ — $ — $ — 1 $ 344 $ 345 $ 1 (1) Includes subsequent payments after modification and reflects the balance as of March 31, 2017 and 2016 . (2) The financial impact includes charge-offs and specific reserves recorded at the modification date. The following table presents the non-PCI TDR modifications for the three months ended March 31, 2017 and 2016 by modification type: ($ in thousands) Modification Type During the Three Month Ended March 31, 2017 2016 Principal (1) Principal and Interest (2) Interest Rate Reduction Other Total Principal (1) Principal and Interest (2) Interest Rate Reduction Other Total CRE $ 1,505 $ — $ — $ — $ 1,505 $ 13,730 $ — $ — $ 28 $ 13,758 C&I — 4,914 — — 4,914 19,112 — 3,615 3,932 26,659 Residential — — — — — 272 — — — 272 Consumer — — — — — 345 — — — 345 Total $ 1,505 $ 4,914 $ — $ — $ 6,419 $ 33,459 $ — $ 3,615 $ 3,960 $ 41,034 (1) Includes forbearance payments, term extensions and principal deferments that modify the terms of the loan from principal and interest payments to interest payments only. (2) Includes principal and interest deferments or reductions. Subsequent to restructuring, a TDR that becomes delinquent, generally beyond 90 days, is considered to have defaulted. As TDRs are individually evaluated for impairment under the specific reserve methodology, subsequent defaults do not generally have a significant additional impact on the allowance for loan losses. The following table presents information for loans modified as TDRs within the previous 12 months that have subsequently defaulted during the three months ended March 31, 2017 and 2016 , and were still in default at the respective period end: Loans Modified as TDRs that Subsequently Defaulted During the Three Months Ended March 31, 2017 2016 ($ in thousands) Number of Recorded Number of Recorded C&I: Commercial business 1 $ 2,718 4 $ 966 The amount of additional funds committed to lend to borrowers whose terms have been modified was $4.0 million and $9.9 million as of March 31, 2017 and December 31, 2016 , respectively. Impaired Loans The Company’s loans are grouped into heterogeneous and homogeneous (mostly consumer loans) categories. Classified loans in the heterogeneous category are identified and evaluated for impairment on an individual basis. A loan is considered impaired when, based on current information and events, it is probable that the Company will not be able to collect all scheduled payments of principal or interest due in accordance with the original contractual terms. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or, as expedient, at the loan’s observable market price or the fair value of the collateral, if the loan is collateral dependent, less costs to sell. When the value of an impaired loan is less than the recorded investment and the loan is classified as nonperforming and uncollectible, the deficiency is charged-off against the allowance for loan losses. Impaired loans exclude the homogeneous consumer loan portfolio, which is evaluated collectively for impairment. The Company’s impaired loans include predominantly non-PCI loans held-for-investment on nonaccrual status and any non-PCI loans modified in a TDR, which may be on accrual or nonaccrual status. The following tables present information on the non-PCI impaired loans as of March 31, 2017 and December 31, 2016 : March 31, 2017 ($ in thousands) Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance CRE: Income producing $ 48,832 $ 34,984 $ 9,528 $ 44,512 $ 1,159 Land 5,050 4,453 47 4,500 6 C&I: Commercial business 182,965 101,963 34,031 135,994 6,218 Trade finance 3,449 3,438 — 3,438 — Residential: Single-family 16,132 1,864 13,172 15,036 611 Multifamily 10,132 5,649 3,575 9,224 121 Consumer 4,897 670 3,855 4,525 32 Total $ 271,457 $ 153,021 $ 64,208 $ 217,229 $ 8,147 December 31, 2016 ($ in thousands) Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance CRE: Income producing $ 50,718 $ 32,507 $ 14,001 $ 46,508 $ 1,263 Land 6,457 5,427 443 5,870 63 C&I: Commercial business 162,239 78,316 42,137 120,453 10,443 Trade finance 5,227 — 5,166 5,166 34 Residential: Single-family 15,435 — 14,335 14,335 687 Multifamily 11,181 5,684 4,357 10,041 180 Consumer 4,016 — 3,682 3,682 31 Total $ 255,273 $ 121,934 $ 84,121 $ 206,055 $ 12,701 The following table presents the average recorded investment and interest income recognized on non-PCI impaired loans during the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 2016 Average Recorded Investment Recognized Interest Income (1) Average Recognized Interest Income (1) CRE: Income producing $ 44,772 $ 35 $ 71,767 $ 391 Land 4,717 — 6,952 9 C&I: Commercial business 138,931 214 94,505 369 Trade finance 4,283 7 13,737 66 Residential: Single-family 15,096 22 18,356 65 Multifamily 9,269 38 22,345 77 Consumer 4,533 12 1,638 16 Total non-PCI impaired loans $ 221,601 $ 328 $ 229,300 $ 993 (1) Includes interest recognized on accruing non-PCI TDRs. Interest payments received on nonaccrual non-PCI loans are reflected as a reduction to principal and not as interest income. Allowance for Credit Losses The following tables present a summary of activities in the allowance for loan losses by portfolio segment for the three months ended March 31, 2017 and 2016 : Three Months Ended March 31, 2017 ($ in thousands) Non-PCI Loans PCI Loans CRE C&I Residential Consumer Total Total Beginning balance $ 72,804 $ 142,166 $ 37,333 $ 8,099 $ 260,402 $ 118 $ 260,520 Provision for (reversal of) loan losses 1,639 1,946 3,835 626 8,046 (31 ) 8,015 Charge-offs (148 ) (7,057 ) — (4 ) (7,209 ) — (7,209 ) Recoveries 593 455 578 142 1,768 — 1,768 Net recoveries (charge-offs) 445 (6,602 ) 578 138 (5,441 ) — (5,441 ) Ending balance $ 74,888 $ 137,510 $ 41,746 $ 8,863 $ 263,007 $ 87 $ 263,094 Three Months Ended March 31, 2016 ($ in thousands) Non-PCI Loans PCI Loans Total CRE C&I Residential Consumer Total Beginning balance $ 81,191 $ 134,597 $ 39,292 $ 9,520 $ 264,600 $ 359 $ 264,959 Provision for (reversal of) loan losses 1,306 4,654 (5,317 ) (226 ) 417 (31 ) 386 Charge-offs (56 ) (5,860 ) (137 ) (1 ) (6,054 ) — (6,054 ) Recoveries 97 686 97 67 947 — 947 Net recoveries (charge-offs) 41 (5,174 ) (40 ) 66 (5,107 ) — (5,107 ) Ending balance $ 82,538 $ 134,077 $ 33,935 $ 9,360 $ 259,910 $ 328 $ 260,238 For further information on accounting policies and the methodology used to estimate the allowance for credit losses and loan charge-offs, see Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements of the Company’s 2016 Form 10-K. The following table presents a summary of activities in the allowance for unfunded credit reserves during the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended 2017 2016 Beginning balance $ 16,121 $ 20,360 (Reversal of) provision for unfunded credit reserves (947 ) 1,054 Ending balance $ 15,174 $ 21,414 The allowance for unfunded credit reserves is maintained at a level believed by management to be sufficient to absorb estimated probable losses related to unfunded credit facilities. The allowance for unfunded credit reserves is included in Accrued expense and other liabilities on the Consolidated Balance Sheets. See Note 11 — Commitments and Contingencies to the Consolidated Financial Statements for additional information related to unfunded credit reserves. The following tables present the Company’s allowance for loan losses and recorded investments by portfolio segment and impairment methodology as of March 31, 2017 and December 31, 2016 : March 31, 2017 ($ in thousands) CRE C&I Residential Consumer Total Allowance for loan losses Individually evaluated for impairment $ 1,165 $ 6,218 $ 732 $ 32 $ 8,147 Collectively evaluated for impairment 73,723 131,292 41,014 8,831 254,860 Acquired with deteriorated credit quality 86 — 1 — 87 Ending balance $ 74,974 $ 137,510 $ 41,747 $ 8,863 $ 263,094 Recorded investment in loans Individually evaluated for impairment $ 49,012 $ 139,432 $ 24,260 $ 4,525 $ 217,229 Collectively evaluated for impairment 8,598,657 9,746,530 5,185,646 2,101,566 25,632,399 Acquired with deteriorated credit quality (1) 339,221 32,110 222,861 17,472 611,664 Ending balance (1) $ 8,986,890 $ 9,918,072 $ 5,432,767 $ 2,123,563 $ 26,461,292 December 31, 2016 ($ in thousands) CRE C&I Residential Consumer Total Allowance for loan losses Individually evaluated for impairment $ 1,326 $ 10,477 $ 867 $ 31 $ 12,701 Collectively evaluated for impairment 71,478 131,689 36,466 8,068 247,701 Acquired with deteriorated credit quality 112 1 5 — 118 Ending balance $ 72,916 $ 142,167 $ 37,338 $ 8,099 $ 260,520 Recorded investment in loans Individually evaluated for impairment $ 52,378 $ 125,619 $ 24,376 $ 3,682 $ 206,055 Collectively evaluated for impairment 8,288,119 9,476,557 4,836,578 2,053,385 24,654,639 Acquired with deteriorated credit quality (1) 350,366 38,387 234,764 18,928 642,445 Ending balance (1) $ 8,690,863 $ 9,640,563 $ 5,095,718 $ 2,075,995 $ 25,503,139 (1) Loans net of ASC 310-30 discount. Purchased Credit Impaired Loans At the date of acquisition, PCI loans are pooled and accounted for at fair value, which represents the discounted value of the expected cash flows of the loan portfolio. A pool is accounted for as a single asset with a single interest rate, cumulative loss rate and cash flow expectation. The cash flows expected over the life of the pools are estimated by an internal cash flow model that projects cash flows and calculates the carrying values of the pools, book yields, effective interest income and impairment, if any, based on pool level events. Assumptions as to cumulative loss rates, loss curves and prepayment speeds are utilized to calculate the expected cash flows. The amount of expected cash flows over the initial investment in the loan represents the “accretable yield,” which is recognized as interest income on a level yield basis over the life of the loan. Prepayments affect the estimated life of PCI loans, which may change the amount of interest income, and possibly principal, expected to be collected. The excess of total contractual cash flows over the cash flows expected to be received at origination is deemed to be the “nonaccretable difference.” The following table presents the changes in accretable yield for PCI loans for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 2016 Beginning balance $ 136,247 $ 214,907 Accretion (10,279 ) (22,429 ) Changes in expected cash flows 2,022 (6,487 ) Ending balance $ 127,990 $ 185,991 Loans Held-for-Sale Loans held-for-sale are carried at the lower of cost or fair value. When a determination is made at the time of commitment to originate or purchase loans as held-for-investment, it is the Company’s intent to hold these loans to maturity or for the “foreseeable future,” subject to periodic reviews under the Company’s management evaluation processes, including asset/liability management. When the Company subsequently changes its intent to hold certain loans, the loans are transferred from the loans held-for-investment portfolio to the loans held-for-sale portfolio at the lower of cost or fair value. As of March 31, 2017 , loans held-for-sale amounted to $28.9 million , which were primarily comprised of C&I loans. As of December 31, 2016 , loans held-for-sale amounted to $23.1 million , which were comprised primarily of consumer loans. Transfers of loans held-for-investment to loans held-for-sale were $278.0 million during the three months ended March 31, 2017 . These loan transfers were comprised of C&I loans. In comparison, $308.7 million of loans held-for-investment were transferred to loans held-for-sale during the three months ended March 31, 2016 . These loan transfers were comprised primarily of multifamily residential, C&I and CRE loans. The Company recorded $92 thousand and $1.8 million , respectively, in write-downs to the allowance for loan losses related to loans transferred from loans held-for-investment to loans held-for-sale for the three months ended March 31, 2017 and 2016 . During the three months ended March 31, 2017 , the Company sold $29.3 million in originated loans, which were comprised of C&I and single-family residential loans, resulting in net gains of $1.8 million . In comparison, during the three months ended March 31, 2016 , the Company sold or securitized $256.2 million in originated loans, which were comprised primarily of multifamily residential, C&I and CRE loans, resulting in net gains of $4.3 million . During the same period, the Company recorded $1.1 million in net gains and $641 thousand in mortgage servicing rights, and retained $160.1 million of the senior tranche of the resulting securities from the securitization of $201.7 million of multifamily residential loans. From time to time, the Company purchases and sells loans in the secondary market. During the three months ended March 31, 2017 , the Company purchased $147.2 million of loans, compared to $239.3 million during the three months ended March 31, 2016 . The decrease in the loans purchased for the three months ended March 31, 2017 , compared to the same period in prior year, was primarily due to the purchase of single-family residential loans that were made to low-to-moderate income borrowers during the three months ended March 31, 2016 , while there was no such purchase during the same period in 2017 . Other loan purchases were largely made within the Company’s syndicated loan portfolio. Certain purchased loans were transferred from loans held-for-investment to loans held-for-sale and a write-down to allowance for loan losses was recorded, where appropriate. During the three months ended March 31, 2017 , the Company sold $246.6 million of loans in the secondary market at a net gain of $1.0 million . In comparison, the Company sold $53.9 million of loans in the secondary market during the three months ended March 31, 2016 and no gains or losses were recognized from these sales. For the three months ended March 31, 2017 and 2016 , the Company recorded valuation adjustments of $69 thousand and $2.4 million , respectively, in Net gains on sales of loans on the Consolidated Statements of Income to carry the loans held-for-sale portfolio at the lower of cost or fair value.

Investments in Qualified Afford

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net	3 Months Ended
	Mar. 31, 2017
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net [Abstract]
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net	Note 9 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net The Community Reinvestment Act (“CRA”) encourages banks to meet the credit needs of their communities for housing and other purposes, particularly in neighborhoods with low or moderate income. The Company invests in certain affordable housing limited partnerships that qualify for CRA credits. Such limited partnerships are formed to develop and operate apartment complexes designed as high-quality affordable housing for lower income tenants throughout the U.S. Each of the partnerships must meet the regulatory requirements for affordable housing for a minimum 15 -year compliance period to fully utilize the tax credits. In addition to affordable housing limited partnerships, the Company invests in new market tax credit projects that qualify for CRA credits and eligible projects that qualify for renewable energy and historic tax credits. Investments in renewable energy tax credits help promote the development of renewable energy sources, while the investments in historic tax credits promote the rehabilitation of historic buildings and economic revitalization of the surrounding areas. Investments in Qualified Affordable Housing Partnerships, Net The Company records its investments in qualified affordable housing partnerships, net, using the proportional amortization method. Under the proportional amortization method, the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the amortization on the Consolidated Statements of Income as a component of income tax expense. The following table presents the balances of the Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of the periods indicated: ($ in thousands) March 31, 2017 December 31, 2016 Investments in qualified affordable housing partnerships, net $ 176,965 $ 183,917 Accrued expenses and other liabilities — Unfunded commitments $ 52,223 $ 57,243 The following table presents additional information related to the Company’s investments in qualified affordable housing partnerships, net, for the periods indicated: ($ in thousands) Three Months Ended 2017 2016 Tax credits and other tax benefits recognized $ 9,621 $ 9,452 Amortization expense included in income tax expense $ 6,950 $ 6,966 Investments in Tax Credit and Other Investments, Net Investments in tax credit and other investments, net, were $177.0 million and $173.3 million as of March 31, 2017 and December 31, 2016 , respectively. The Company is not the primary beneficiary in these partnerships and, therefore, is not required to consolidate its investments in tax credit and other investments on the Consolidated Financial Statements. Depending on the ownership percentage and the influence the Company has on the limited partnership, the Company applies either the equity method or cost method of accounting. Total unfunded commitments for these investments were $101.8 million and $117.0 million as of March 31, 2017 and December 31, 2016 , respectively, and were included in Accrued expenses and other liabilities on the Consolidated Balance Sheets. Amortization of tax credit and other investments was $14.4 million and $14.2 million for the three months ended March 31, 2017 and 2016 , respectively.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	3 Months Ended
	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Note 10 — Goodwill and Other Intangible Assets Goodwill Total goodwill of $469.4 million remained unchanged as of March 31, 2017 compared to December 31, 2016 . Goodwill is tested for impairment on an annual basis as of December 31 st , or more frequently as events occur or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount. The Company’s three operating segments, Retail Banking, Commercial Banking, and Other, are equivalent to the Company’s reporting units. For complete discussion and disclosure, see Note 15 — Business Segments to the Consolidated Financial Statements. Impairment Analysis The Company performed its annual impairment analysis as of December 31, 2016 and concluded that there was no goodwill impairment as the fair values of all reporting units exceeded the carrying amounts of goodwill. There were no triggering events during the three months ended March 31, 2017 and therefore, no additional goodwill impairment analysis was performed. No assurance can be given that goodwill will not be written down in future periods. Refer to Note 9 — Goodwill and Other Intangible Assets to the Consolidated Financial Statements of the Company’s 2016 Form 10-K for additional details related to the Company’s annual goodwill impairment analysis. Core Deposit Intangibles Core deposit intangibles represent the intangible value of depositor relationships resulting from deposit liabilities assumed in various acquisitions. These intangibles are tested for impairment on an annual basis, or more frequently as events occur, or as current circumstances and conditions warrant. There were no impairment write-downs on core deposit intangibles for the three months ended March 31, 2017 and 2016 . The following table presents the gross carrying value of intangible assets and accumulated amortization as of March 31, 2017 and December 31, 2016 : ($ in thousands) March 31, 2017 December 31, 2016 Gross balance $ 108,814 $ 108,814 Accumulated amortization 82,642 80,825 Net carrying balance $ 26,172 $ 27,989 Amortization Expense The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits. The amortization expense related to the intangible assets was $1.8 million and $2.1 million for the three months ended March 31, 2017 and 2016 , respectively. The following table presents the estimated future amortization expense of core deposit intangibles: Year Ended December 31, Amount ($ in thousands) Remainder of 2017 $ 5,118 2018 5,883 2019 4,864 2020 3,846 2021 2,833 Thereafter 3,628 Total $ 26,172

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Note 11 — Commitments and Contingencies Credit Extensions — In the normal course of business, the Company has various outstanding commitments to extend credit that are not reflected in the accompanying Consolidated Financial Statements. While the Company does not anticipate losses as a result of these transactions, commitments to extend credit are included in determining the appropriate level of the allowance for unfunded commitments and outstanding commercial and standby letters of credit (“ SBLCs”). The following table presents the Company’s credit-related commitments as of the periods indicated: ($ in thousands) March 31, 2017 December 31, 2016 Loan commitments $ 5,007,903 $ 5,077,869 Commercial letters of credit and SBLCs $ 1,695,083 $ 1,525,613 Loan commitments are agreements to lend to a customer provided there is no violation of any condition established in the agreement. Commitments generally have fixed expiration dates or other termination clauses and may require maintenance of compensatory balances. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future funding requirements. Commercial letters of credit are issued to facilitate domestic and foreign trade transactions while SBLCs generally are contingent upon the failure of the customers to perform according to the terms of the underlying contract with the third party. As a result, the total contractual amounts do not necessarily represent future funding requirements. The Company’s historical experience is that SBLCs typically expire without being funded. Additionally, in many cases, the Company holds collateral in various forms against these SBLCs. As a part of its risk management activities, the Company monitors the creditworthiness of customers in conjunction with its SBLC exposure. Customers are obligated to reimburse the Company for any payment made on the customers’ behalf. If customers fail to pay, the Company would, as applicable, liquidate the collateral and/or offset accounts. Total letters of credit of $1.70 billion consisted of commercial letters of credit of $58.7 million and SBLCs of $1.64 billion as of March 31, 2017 . The Company uses the same credit underwriting criteria in extending loans, commitments and conditional obligations to customers. Each customer’s creditworthiness is evaluated on a case-by-case basis. Collateral and financial guarantees may be obtained based on management’s assessment of the customer’s credit. Collateral may include cash, accounts receivable, inventory, property, plant and equipment and income-producing commercial property. Estimated exposure to loss from these commitments is included in the allowance for unfunded credit reserves and amounted to $14.8 million as of March 31, 2017 and $15.7 million as of December 31, 2016 . These amounts are included in Accrued expenses and other liabilities on the Consolidated Balance Sheets. Guarantees — The Company has sold or securitized loans with recourse in the ordinary course of business. The recourse component in the loans sold or securitized with recourse is considered a guarantee. As the guarantor, the Company is obligated to make payments when the loans default. As of March 31, 2017 and December 31, 2016 , the unpaid principal balance of total single-family and multifamily residential loans sold or securitized with recourse amounted to $139.6 million and $150.5 million , respectively. The Company’s recourse reserve related to these guarantees is included in the allowance for unfunded credit reserves and totaled $333 thousand and $373 thousand as of March 31, 2017 and December 31, 2016 , respectively. The allowance for unfunded credit reserves is included in Accrued expenses and other liabilities on the Consolidated Balance Sheets. The Company continues to experience minimal losses from the single-family and multifamily residential loan portfolios sold or securitized with recourse. Litigation — The Company is a party to various legal actions arising in the course of business. In accordance with ASC 450, Contingencies , the Company accrues reserves for currently outstanding lawsuits, claims, and proceedings when a loss contingency is probable and can be reasonably estimated. The outcome of such legal actions is inherently difficult to predict and it is possible that one or more of the currently pending or threatened legal or regulatory matters could have a material adverse effect on the Company’s liquidity, consolidated financial position, and/or results of operations. In 2016, the Company entered into a settlement agreement to fully resolve and discharge the “F&F, LLC and 618 Investment, Inc. v. East West Bank” litigation and had accrued $25.0 million as of December 31, 2016 . These amounts were subsequently paid in January 2017. Other Commitments — The Company has commitments to invest in qualified affordable housing partnerships and other tax credit investments qualifying for low income housing tax credits or other types of tax credits. These commitments are payable on demand. As of March 31, 2017 and December 31, 2016 , these commitments were $154.0 million and $174.3 million , respectively. These commitments are included in Accrued expenses and other liabilities on the Consolidated Balance Sheets.

Stock Compensation Plans

Stock Compensation Plans	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Compensation Plans	Note 12 — Stock Compensation Plans Pursuant to the Company’s 2016 Stock Incentive Plan, as amended, the Company may issue stock options, restricted stock awards (“RSAs”), RSUs, stock appreciation rights, stock purchase warrants, phantom stock and dividend equivalents to certain employees and non-employee directors of the Company and its subsidiaries. There were no outstanding stock options and unvested RSAs as of March 31, 2017 and 2016. RSUs are granted under the Company’s long-term incentive plan at no cost to the recipient. RSUs vest ratably over three years or cliff vest after three or five years of continued employment from the date of the grant. RSUs entitle the recipient to receive cash dividends equivalent to any dividends paid on the underlying common stock during the period RSUs are outstanding. The RSU dividends are accrued during the vesting period and are paid at the time of vesting. While a portion of RSUs are time-vesting awards, others vest subject to the attainment of specified performance goals referred to as “Performance-based RSUs.” All RSUs are subject to forfeiture until vested. Performance-based RSUs are granted at the target amount of awards. Based on the Company’s attainment of specified performance goals and consideration of market conditions, the number of shares that vest can be adjusted to a minimum of zero and to a maximum of 200% of the target. The amount of performance-based RSUs that are eligible to vest is determined at the end of each performance period and is then added together to determine the total number of performance shares that are eligible to vest. Performance-based RSUs cliff vest three years from the date of the grant. Compensation costs for the time-based awards are based on the quoted market price of the Company’s stock at the grant date. Compensation costs associated with performance-based RSUs are based on grant date fair value which considers both market and performance conditions and is subject to subsequent adjustments based on the changes in the Company’s stock price and the projected outcome of the performance criteria. Compensation costs of both time-based and performance-based awards are recognized on a straight-line basis from the grant date until the vesting date of each grant. The following table presents a summary of the total share-based compensation expense and the related net tax benefit associated with the Company’s various employee share-based compensation plans for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended 2017 2016 Stock compensation costs $ 5,151 $ 4,575 Related net tax benefit for stock compensation plans $ 4,414 $ 986 Effective January 1, 2017, the Company adopted ASU 2016-09, Compensation — Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting . As a result of the adoption of this new guidance, all excess tax benefits and deficiencies on share-based payment awards are recognized within Income tax expense on the Consolidated Statements of Income for the three months ended March 31, 2017. For the three months ended March 31, 2016, these tax benefits were recorded as increases to Additional paid-in capital in the Consolidated Statements of Changes in Stockholders’ Equity. The following table presents a summary of the activity for the Company’s time-based and performance-based RSUs for the three months ended March 31, 2017 based on the target amount of awards: Three Months Ended March 31, 2017 Time-Based RSUs Performance-Based RSUs Shares Weighted Average Grant-Date Fair Value Shares Weighted Average Grant-Date Fair Value Outstanding at beginning of period 1,218,714 $ 35.92 410,746 $ 35.27 Granted 330,762 54.49 131,597 56.59 Vested (279,549 ) 36.84 (118,044 ) 36.85 Forfeited (61,193 ) 39.25 — — Outstanding at end of period 1,208,734 $ 40.62 424,299 $ 41.44 As of March 31, 2017 , total unrecognized compensation costs related to time-based and performance-based RSUs amounted to $34.6 million and $20.2 million , respectively. These costs are expected to be recognized over a weighted average period of 2.30 years and 2.41 years, respectively.

Stockholders' Equity and Earnin

Stockholders' Equity and Earnings Per Share	3 Months Ended
	Mar. 31, 2017
Stockholders' Equity and Earnings Per Share [Abstract]
Stockholders' Equity and Earnings Per Share	Note 13 — Stockholders’ Equity and Earnings Per Share Warrant — The Company acquired MetroCorp Bancshares, Inc., (“MetroCorp”) on January 17, 2014. Prior to the acquisition, MetroCorp had an outstanding warrant to purchase 771,429 shares of its common stock. Upon the acquisition, the rights of the warrant holder were converted into the right to acquire 230,282 shares of East West’s common stock until January 16, 2019. The warrant has no t been exercised as of March 31, 2017 . EPS — Basic EPS is computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding during each period. Diluted EPS is computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding during each period, plus common share equivalents calculated for warrants and RSUs outstanding using the treasury stock method. With the adoption of ASU 2016-09 during the first quarter of 2017, the impact of excess tax benefits and deficiencies is no longer included in the calculation of diluted EPS. In addition, the adoption of ASU 2016-09 favorably impacted basic and diluted EPS by $0.03 per share each for the three months ended March 31, 2017. See Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information. The following table presents the EPS calculations for the three months ended March 31, 2017 and 2016 : Three Months Ended ($ and shares in thousands, except per share data) 2017 2016 Basic Net income $ 169,736 $ 107,516 Basic weighted average number of shares outstanding 144,249 143,958 Basic EPS $ 1.18 $ 0.75 Diluted Net income $ 169,736 $ 107,516 Basic weighted average number of shares outstanding 144,249 143,958 Diluted potential common shares (1) 1,483 845 Diluted weighted average number of shares outstanding 145,732 144,803 Diluted EPS $ 1.16 $ 0.74 (1) Includes dilutive shares from RSUs and warrants for the three months ended March 31, 2017 and 2016 . For the three months ended March 31, 2017 and 2016 , approximately 194 thousand and 13 thousand weighted average anti-dilutive shares from RSUs, respectively, were excluded from the diluted EPS computation.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Note 14 — Accumulated Other Comprehensive Income (Loss) The following table presents the changes in the components of AOCI balances for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 2016 Available- Foreign (1) Total Available- Foreign (1) Total Beginning balance $ (28,772 ) $ (19,374 ) $ (48,146 ) $ (6,144 ) $ (8,797 ) $ (14,941 ) Net unrealized gains (losses) arising during the period 5,055 1,007 6,062 15,142 (33 ) 15,109 Amounts reclassified from AOCI (1,434 ) — (1,434 ) (2,226 ) — (2,226 ) Changes, net of taxes 3,621 1,007 4,628 12,916 (33 ) 12,883 Ending balance $ (25,151 ) $ (18,367 ) $ (43,518 ) $ 6,772 $ (8,830 ) $ (2,058 ) (1) Represents foreign currency translation adjustments related to the Company’s net investment in non-U.S. operations, including related hedges. The functional currency and reporting currency of the Company’s foreign subsidiary was Chinese Renminbi and USD, respectively. The following table presents the components of other comprehensive income, reclassifications to net income and the related tax effects for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 2016 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax Available-for-sale investment securities: Net unrealized gains arising during the period $ 8,721 $ (3,666 ) $ 5,055 $ 26,130 $ (10,988 ) $ 15,142 Net realized gains reclassified into net income (1) (2,474 ) 1,040 (1,434 ) (3,842 ) 1,616 (2,226 ) Net change 6,247 (2,626 ) 3,621 22,288 (9,372 ) 12,916 Foreign currency translation adjustments: Net unrealized gains (losses) arising during period 1,007 — 1,007 (33 ) — (33 ) Net change 1,007 — 1,007 (33 ) — (33 ) Other comprehensive income $ 7,254 $ (2,626 ) $ 4,628 $ 22,255 $ (9,372 ) $ 12,883 (1) For the three months ended March 31, 2017 and 2016 , the pretax amounts were reported in Net gains on sales of available-for-sale investment securities on the Consolidated Statements of Income.

Business Segments

Business Segments	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Business Segments	Note 15 — Business Segments The Company utilizes an internal reporting system to measure the performance of various operating segments within the Bank and the Company. The Company has identified three operating segments for purposes of management reporting: (1) Retail Banking; (2) Commercial Banking; and (3) Other. These three business divisions meet the criteria of an operating segment: the segment engages in business activities from which it earns revenues and incurs expenses; its operating results are regularly reviewed by the Company’s chief operating decision-maker to render decisions about resources to be allocated to the segment and assess its performance; and discrete financial information is available. The Retail Banking segment focuses primarily on retail operations through the Bank’s branch network. The Commercial Banking segment, which includes C&I and CRE operations, primarily generates commercial loans and deposits through the commercial lending offices located in the Bank’s production offices. Furthermore, the Company’s Commercial Banking segment offers a wide variety of international finance, trade, and cash management services and products. The remaining centralized functions, including treasury activities and eliminations of inter-segment amounts, have been aggregated and included in the “Other” segment, which provides broad administrative support to the two core segments. Operating segment results are based on the Company’s internal management reporting process, which reflects assignments and allocations of certain operating and administrative costs and the provision for credit losses. Net interest income is based on the Company’s internal funds transfer pricing system which assigns a cost of funds or a credit for funds to assets or liabilities based on their type, maturity or repricing characteristics. Noninterest income and noninterest expense, including depreciation and amortization, directly attributable to a segment are assigned to that business segment. Indirect costs, including overhead expense, are allocated to the segments based on several factors, including, but not limited to, full-time equivalent employees, loan volume and deposit volume. The provision for credit losses is allocated based on actual charge-offs for the period as well as average loan balances for each segment during the period. The Company evaluates overall performance based on profit or loss from operations before income taxes excluding nonrecurring gains and losses. The Company’s internal funds transfer pricing assumptions are intended to promote core deposit growth and to reflect the current risk profiles of various loan categories within the credit portfolio. Internal transfer pricing assumptions and methodologies are reviewed at least annually to ensure that the Company’s process is reflective of current market conditions. The internal transfer pricing process is formulated with the goal of incentivizing loan and deposit growth that is consistent with the Company’s overall growth objectives, as well as to provide a reasonable and consistent basis for the measurement of the Company’s business segments and product net interest margins. The accounting policies of the segments are the same as those described in Note 1 — Summary of Significant Accounting Policies to the Consolidated Financial Statements of the Company’s 2016 Form 10-K. Changes in the Company’s management structure or reporting methodologies may result in changes in the measurement of operating segment results. Results for prior periods are generally restated for comparability for changes in management structure or reporting methodologies unless it is deemed not practicable to do so. The following tables present the operating results and other key financial measures for the individual operating segments as of and for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 Retail Banking Commercial Banking Other Total Interest income $ 81,648 $ 191,796 $ 29,225 $ 302,669 Charge for funds used (27,860 ) (64,387 ) (28,167 ) (120,414 ) Interest spread on funds used 53,788 127,409 1,058 182,255 Interest expense (16,173 ) (5,108 ) (9,266 ) (30,547 ) Credit on funds provided 102,528 12,061 5,825 120,414 Interest spread on funds provided 86,355 6,953 (3,441 ) 89,867 Net interest income (loss) before provision for credit losses $ 140,143 $ 134,362 $ (2,383 ) $ 272,122 Provision for credit losses $ 381 $ 6,687 $ — $ 7,068 Depreciation, amortization and (accretion), net $ 2,344 $ (3,474 ) $ 29,260 $ 28,130 Segment income before income taxes $ 73,361 $ 91,798 $ 62,845 $ 228,004 As of March 31, 2017: Goodwill $ 357,207 $ 112,226 $ — $ 469,433 Segment assets $ 8,213,268 $ 19,624,237 $ 7,504,621 $ 35,342,126 ($ in thousands) Three Months Ended March 31, 2016 Retail Commercial Other Total Interest income $ 77,371 $ 177,082 $ 21,719 $ 276,172 Charge for funds used (22,652 ) (53,791 ) (11,837 ) (88,280 ) Interest spread on funds used 54,719 123,291 9,882 187,892 Interest expense (14,606 ) (4,026 ) (5,336 ) (23,968 ) Credit on funds provided 72,431 9,977 5,872 88,280 Interest spread on funds provided 57,825 5,951 536 64,312 Net interest income before provision for credit losses $ 112,544 $ 129,242 $ 10,418 $ 252,204 (Reversal of) provision for credit losses $ (1,582 ) $ 3,022 $ — $ 1,440 Depreciation, amortization and (accretion), net $ 43 $ (10,773 ) $ 23,488 $ 12,758 Segment income before income taxes $ 45,945 $ 92,829 $ 5,897 $ 144,671 As of March 31, 2016: Goodwill $ 357,207 $ 112,226 $ — $ 469,433 Segment assets $ 7,203,470 $ 17,939,537 $ 7,966,162 $ 33,109,169

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2017
Subsequent Events [Abstract]
Subsequent Events	Note 16 — Subsequent Events On April 19, 2017 , the Company’s Board of Directors declared second quarter 2017 cash dividends for the Company’s common stock. The common stock cash dividend of $0.20 is payable on May 15, 2017 to stockholders of record as of May 1, 2017 .

Basis of Presentation (Policies

Basis of Presentation (Policies)	3 Months Ended
	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation	East West Bancorp, Inc. (referred to herein on an unconsolidated basis as “East West” and on a consolidated basis as the “Company”) is a registered bank holding company that offers a full range of banking services to individuals and businesses through its subsidiary bank, East West Bank and its subsidiaries (“East West Bank” or the “Bank”). The unaudited interim Consolidated Financial Statements in this Form 10-Q include the accounts of East West, East West Bank, East West Insurance Services, Inc., and various subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. As of March 31, 2017 , East West also has six wholly-owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with FASB Accounting Standards Codification (“ASC”) Topic 810, the Trusts are not included on the Consolidated Financial Statements.
Basis of Presentation	The unaudited interim Consolidated Financial Statements presented in accordance with United States Generally Accepted Accounting Principles (“U.S. GAAP”), applicable guidelines prescribed by regulatory authorities, and general practices in the banking industry, reflect all adjustments that, in the opinion of management, are necessary for fair statement of the interim period financial statements. Certain items on the Consolidated Financial Statements and notes for the prior years have been reclassified to conform to the current period presentation.
Current Accounting Developments	NEW ACCOUNTING PRONOUNCEMENTS ADOPTED In March 2016, the FASB issued Accounting Standards Update (“ASU”) 2016-05, Derivatives and Hedging (Topic 815): Effect of Derivative Contract Novations on Existing Hedge Accounting Relationships , to clarify that a change in the counterparty to a derivative instrument that has been designated as the hedging instrument in an existing hedging relationship would not be considered a termination of the derivative instrument or a change in a critical term of the hedging relationship provided that all other hedge accounting criteria in ASC 815 continue to be met. This clarification applies to both cash flow and fair value hedging relationships. The Company adopted this guidance prospectively in the first quarter of 2017. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-06, Derivatives and Hedging (Topic 815): Contingent Put and Call Options in Debt Instruments which requires an entity to use a four step decision model when assessing contingent call (put) options that can accelerate the payment of principal on debt instruments to determine whether they are clearly and closely related to their debt hosts. The Company adopted this guidance on a modified retrospective basis in the first quarter of 2017. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-07, Investments — Equity Method and Joint Ventures (Topic 323): Simplifying the Transition to the Equity Method of Accounting, to eliminate the requirement for an investor to retroactively apply the equity method when its increase in ownership interest (or degree of influence) in an investee triggers equity method accounting. The amendments in ASU 2016-07 also require that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in AOCI at the date the investment becomes qualified for use of the equity method. The Company adopted this guidance prospectively in the first quarter of 2017. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In March 2016, the FASB issued ASU 2016-09, Compensation — Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting, to simplify several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities and classification in the statement of cash flows. The Company adopted ASU 2016-09 in the first quarter of 2017. The changes that impacted the Company included a requirement that excess tax benefits and deficiencies be recognized as a component of Income tax expense on the Consolidated Statements of Income rather than Additional paid-in capital on the Consolidated Statements of Changes in Stockholders’ Equity as required in the previous guidance. Net excess tax benefits for restricted stock units (“RSUs”) of approximately $4.4 million were recognized by the Company as a component of Income tax expense on the Consolidated Statements of Income during the first quarter of 2017. This change also removes the impact of the excess tax benefits and deficiencies from the calculation of diluted EPS. In addition, ASU 2016-09 no longer requires a presentation of excess tax benefits and deficiencies as both an operating outflow and financing inflow on the Consolidated Statements of Cash Flows. Instead, excess tax benefits and deficiencies are recorded along with other income tax cash flows as an operating activity on the Consolidated Statements of Cash Flows. These changes were applied on a prospective basis. The adoption of ASU 2016-09 will result in increased volatility to the Company’s income tax expense but is not expected to have a material impact on the Consolidated Balance Sheets or the Consolidated Statements of Changes in Stockholders’ Equity. The income tax expense volatility is dependent on the Company’s stock price on the dates the RSUs vest, which occur primarily in the first quarter of each year. The Company has elected to retain its existing accounting policy election to estimate award forfeitures. RECENT ACCOUNTING PRONOUNCEMENTS In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606) . The new guidance replaces existing revenue recognition guidance for contracts to provide goods or services to customers. ASU 2014-09 clarifies the principles for recognizing revenue and replaces nearly all existing revenue recognition guidance in U.S. GAAP. Quantitative and qualitative disclosures regarding the nature, amount, timing and uncertainty of revenue and cash flows arising from contracts with customers are also required. ASU 2014-09 as amended by ASU 2015-14, ASU 2016-08, ASU 2016-10, ASU 2016-12 and ASU 2016-20, is effective for interim and annual periods beginning after December 15, 2017 and is applied on either a modified retrospective or full retrospective basis. Early adoption is permitted for interim and annual periods beginning after December 15, 2016. The Company’s revenue is mainly comprised of net interest income and noninterest income. The scope of the guidance explicitly excludes net interest income, as well as other revenues from financial instruments such as loans, leases, securities and derivatives. The Company has conducted a comprehensive scoping exercise to determine the revenue streams that are in the scope of these updates. Preliminary results indicate that certain noninterest income financial statement line items may contain revenue streams that are in the scope of these updates. The Company’s next implementation efforts include identifying contracts within the scope of the new guidance and assessing the related noninterest income revenues to determine if any accounting or internal control changes will be required under the provisions of the new guidance. The Company continues to evaluate the impact of ASU 2014-09 on our noninterest income and on our presentation and disclosures. In January 2016, the FASB issued ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. ASU 2016-01 requires equity investments, except those accounted for under the equity method of accounting or consolidated, to be measured at fair value with changes recognized in net income. If there is no readily determinable fair value, the guidance allows entities the ability to measure investments at cost less impairment, whereby impairment is based on a qualitative assessment. The guidance eliminates the requirement to disclose the methods and significant assumptions used to estimate the fair value of financial instruments measured at amortized cost and changes the presentation of financial assets and financial liabilities on the Consolidated Balance Sheets or in the footnotes. If an entity has elected the fair value option to measure liabilities, the new accounting guidance requires the portion of the change in the fair value of a liability resulting from credit risk to be presented in Other Comprehensive Income . The Company has not elected to measure any of its liabilities at fair value, and therefore, this aspect of the guidance is not applicable to us. ASU 2016-01 is effective for interim and annual reporting periods beginning after December 15, 2017. Early adoption is not permitted except for certain specific changes under the fair value option guidance. To adopt the amendments, the Company is required to make a cumulative effect adjustment to the Consolidated Balance Sheets as of the beginning of the fiscal year in which the guidance is effective. However, the amendments related to equity securities without readily determinable fair values (including disclosure requirements) should be applied prospectively to equity investments that exist as of the adoption date. The Company is currently evaluating the impact on its Consolidated Financial Statements. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), which is intended to increase transparency and comparability in the accounting for lease transactions. ASU 2016-02 requires lessees to recognize all leases longer than 12 months on the Consolidated Balance Sheet as lease assets and lease liabilities and provide quantitative and qualitative disclosures regarding key information about leasing arrangements. For short-term leases with a term of 12 months or less, lessees can make a policy election not to recognize lease assets and lease liabilities. Lessor accounting is largely unchanged. ASU 2016-02 is effective for interim and annual reporting periods beginning after December 15, 2018 with modified retrospective application. Early adoption is permitted. The Company expects the adoption of ASU 2016-02 to result in additional assets and liabilities, as the Company will be required to recognize operating leases on its Consolidated Balance Sheets. The Company does not expect a material impact to its recognition of operating lease expense on its Consolidated Statements of Income. In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments to introduce a new approach based on expected losses to estimate credit losses on certain types of financial instruments, which modifies the impairment model for available-for-sale debt securities and provides for a simplified accounting model for purchased financial assets with credit deterioration since their origination. The new “expected credit loss” impairment model will apply to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loans, available-for-sale and held-to-maturity debt securities, net investments in leases and off-balance-sheet credit exposures. For available-for-sale debt securities with unrealized losses, ASU 2016-13 does not change the measurement method of credit losses, except that the losses will be recognized as allowances rather than reductions in the amortized cost of the securities. ASU 2016-13 also expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loans and lease losses and requires disclosure of the amortized cost balance for each class of financial asset by credit quality indicator, disaggregated by the year of origination (i.e., by vintage year). ASU 2016-13 is effective for the fiscal years beginning after December 15, 2019, including interim periods within those fiscal years using a modified retrospective approach through a cumulative effect adjustment to retained earnings as of the beginning of the first reporting period in which the guidance is effective. Earlier adoption is permitted as of the fiscal years beginning after December 15, 2018, including interim periods within those fiscal years. While the Company is still evaluating the impact on its Consolidated Financial Statements, the Company expects that ASU 2016-13 may result in an increase in the allowance for credit losses due to the following factors: 1) the allowance for credit losses provides for expected credit losses over the remaining expected life of the loan portfolio, and will consider expected future changes in macroeconomic conditions; 2) the nonaccretable difference on the purchased credit impaired (“PCI”) loans will be recognized as an allowance, offset by an increase in the carrying value of the PCI loans; and 3) an allowance may be established for estimated credit losses on available-for-sale and held-to-maturity debt securities. The amount of the increase will be impacted by the portfolio composition and quality, as well as the economic conditions and forecasts as of the adoption date. The Company has began its implementation efforts by identifying key interpretive issues, and assessing its processes and identifying the system requirements against the new guidance to determine what modifications may be required. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flow (Topic 230): Classification of Certain Cash Receipts and Cash Payments , to provide guidance on the classification of certain cash receipts and payments on the Consolidated Statements of Cash Flows in order to reduce diversity in practice. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years. The guidance requires application using a retrospective transition method. Early adoption is permitted. The Company does not expect the adoption of this guidance to have a material impact on its Consolidated Financial Statements. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which requires the Company to include in its cash and cash equivalents balances on the Statements of Cash Flows those amounts that are deemed to be restricted cash and restricted cash equivalents. In addition, the Company is required to explain the changes in the combined total of restricted and unrestricted balances on the Statements of Cash Flows. ASU 2016-18 is effective for fiscal years beginning after December 15, 2017, including interim periods within those fiscal years, where the guidance should be applied using a retrospective transition method to each period presented. Early adoption is permitted. The Company is currently evaluating the impact on its Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-04, Intangibles — Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment to simplify the accounting for goodwill impairment. An entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, impairment will be measured using the difference between the carrying amount and the fair value of the reporting unit. ASU 2017-04 also eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment. ASU 2017-04 is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years and should be applied prospectively. Early adoption is permitted for interim or annual goodwill impairment tests with measurement dates after January 1, 2017. The Company is currently evaluating the impact on its Consolidated Financial Statements. In March 2017, the FASB issued ASU 2017-08, Receivables — Nonrefundable Fees and Other Costs (Subtopic 310-20): Premium Amortization on Purchased Callable Debt Securities , which amends the amortization period for certain purchased callable debt securities held at a premium, shortening such period to the earliest call date. Therefore, entities will no longer recognize a loss in earnings upon the debtor’s exercise of a call on a purchased callable debt security held at a premium. The ASU does not require any accounting change for debt securities held at a discount; the discount continues to be amortized as an adjustment of yield over the contractual life (to maturity) of the instrument. ASU 2017-08 is effective for interim and annual reporting periods beginning after December 15, 2018. Early adoption is permitted. Entities must apply a modified retrospective approach, with the cumulative effect adjustment recognized to retained earnings as of the beginning of the period of adoption. Entities are also required to provide disclosures about a change in accounting principle in the period of adoption. The Company is currently evaluating the impact on its Consolidated Financial Statements.
Credit Quality Indicators	All loans are subject to the Company’s internal and external credit review and monitoring. Loans are risk rated based on an analysis of the current state of the borrower’s credit quality. The analysis of credit quality includes a review of all repayment sources, the borrower’s current payment performance/delinquency, current financial and liquidity status and all other relevant information. For single-family residential loans, payment performance/delinquency is the driving indicator for the risk ratings. Risk ratings are the overall credit quality indicator for the Company and the credit quality indicator utilized for estimating the appropriate allowance for loan losses. The Company utilizes a risk rating system, which can be classified within the following categories: Pass, Watch, Special Mention, Substandard, Doubtful and Loss. The risk ratings reflect the relative strength of the repayment sources. Pass and Watch loans are generally considered to have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special Mention loans are considered to have potential weaknesses that warrant closer attention by management. Special Mention is considered a transitory grade. If potential weaknesses are resolved, the loan is upgraded to a Pass or Watch grade. If negative trends in the borrower’s financial status or other information indicate that the repayment sources may become inadequate, the loan is downgraded to a Substandard grade. Substandard loans are considered to have well-defined weaknesses that jeopardize the full and timely repayment of the loan. Substandard loans have a distinct possibility of loss, if the deficiencies are not corrected. Additionally, when management has assessed a potential for loss but a distinct possibility of loss is not recognizable, the loan is still classified as Substandard. Doubtful loans have insufficient sources of repayment and a high probability of loss. Loss loans are considered to be uncollectible and of such little value that they are no longer considered bankable assets. These internal risk ratings are reviewed routinely and adjusted based on changes in the borrowers’ financial status and the loans’ collectability.
Impaired Loans	The Company’s loans are grouped into heterogeneous and homogeneous (mostly consumer loans) categories. Classified loans in the heterogeneous category are identified and evaluated for impairment on an individual basis. A loan is considered impaired when, based on current information and events, it is probable that the Company will not be able to collect all scheduled payments of principal or interest due in accordance with the original contractual terms. Impaired loans are measured based on the present value of expected future cash flows discounted at the loan’s effective interest rate or, as expedient, at the loan’s observable market price or the fair value of the collateral, if the loan is collateral dependent, less costs to sell. When the value of an impaired loan is less than the recorded investment and the loan is classified as nonperforming and uncollectible, the deficiency is charged-off against the allowance for loan losses. Impaired loans exclude the homogeneous consumer loan portfolio, which is evaluated collectively for impairment. The Company’s impaired loans include predominantly non-PCI loans held-for-investment on nonaccrual status and any non-PCI loans modified in a TDR, which may be on accrual or nonaccrual status.
Investments in Qualified Affordable Housing Partnerships, Net	The Company records its investments in qualified affordable housing partnerships, net, using the proportional amortization method. Under the proportional amortization method, the Company amortizes the initial cost of the investment in proportion to the tax credits and other tax benefits received, and recognizes the amortization on the Consolidated Statements of Income as a component of income tax expense.
Goodwill and Other Intangible Assets	Core deposit intangibles represent the intangible value of depositor relationships resulting from deposit liabilities assumed in various acquisitions. These intangibles are tested for impairment on an annual basis, or more frequently as events occur, or as current circumstances and conditions warrant. Goodwill is tested for impairment on an annual basis as of December 31 st , or more frequently as events occur or circumstances change that would more likely than not reduce the fair value of a reporting unit below its carrying amount.
Amortization Expense	The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits.
Earnings Per Share	EPS — Basic EPS is computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding during each period. Diluted EPS is computed by dividing net income available to common stockholders by the weighted average number of common shares outstanding during each period, plus common share equivalents calculated for warrants and RSUs outstanding using the treasury stock method.

Fair Value Measurement and Fa25

Fair Value Measurement and Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2017
Quantitative information
Schedule of assets (liabilities) measured at fair value on a recurring basis	The following tables present financial assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2017 and December 31, 2016 : Assets (Liabilities) Measured at Fair Value on a Recurring Basis ($ in thousands) Fair Value Measurements Quoted Prices in Active Markets for Identical Assets (Level 1) Significant Other Observable Inputs (Level 2) Significant Unobservable Inputs (Level 3) Available-for-sale investment securities: U.S. Treasury securities $ 700,860 $ 700,860 $ — $ — U.S. government agency and U.S. government sponsored enterprise debt securities 180,863 — 180,863 — U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 264,522 — 264,522 — Residential mortgage-backed securities 1,179,755 — 1,179,755 — Municipal securities 147,069 — 147,069 — Non-agency residential mortgage-backed securities: Investment grade 10,730 — 10,730 — Corporate debt securities: Investment grade 2,254 — 2,254 — Non-investment grade 9,184 — 9,184 — Foreign bonds: Investment grade 425,868 — 425,868 — Other securities 40,929 31,075 9,854 — Total available-for-sale investment securities $ 2,962,034 $ 731,935 $ 2,230,099 $ — Derivative assets: Interest rate swaps and options $ 61,586 $ — $ 61,586 $ — Foreign exchange contracts $ 8,220 $ — $ 8,220 $ — Credit risk participation agreements (“RPAs”) $ 3 $ — $ 3 $ — Derivative liabilities: Interest rate swaps on certificates of deposit $ (6,793 ) $ — $ (6,793 ) $ — Interest rate swaps and options $ (60,204 ) $ — $ (60,204 ) $ — Foreign exchange contracts $ (7,357 ) $ — $ (7,357 ) $ — RPAs $ (2 ) $ — $ (2 ) $ — Assets (Liabilities) Measured at Fair Value on a Recurring Basis ($ in thousands) Fair Value Measurements Quoted Prices in Significant Significant Unobservable Inputs (Level 3) Available-for-sale investment securities: U.S. Treasury securities $ 720,479 $ 720,479 $ — $ — U.S. government agency and U.S. government sponsored enterprise debt securities 274,866 — 274,866 — U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 266,799 — 266,799 — Residential mortgage-backed securities 1,258,747 — 1,258,747 — Municipal securities 147,654 — 147,654 — Non-agency residential mortgage-backed securities: Investment grade 11,477 — 11,477 — Corporate debt securities: Investment grade 222,377 — 222,377 — Non-investment grade 9,173 — 9,173 — Foreign bonds: Investment grade 383,894 — 383,894 — Other securities 40,329 30,991 9,338 — Total available-for-sale investment securities $ 3,335,795 $ 751,470 $ 2,584,325 $ — Derivative assets: Foreign currency forward contracts $ 4,325 $ — $ 4,325 $ — Interest rate swaps and options $ 67,578 $ — $ 67,578 $ — Foreign exchange contracts $ 11,874 $ — $ 11,874 $ — RPAs $ 3 $ — $ 3 $ — Derivative liabilities: Interest rate swaps on certificates of deposit $ (5,976 ) $ — $ (5,976 ) $ — Interest rate swaps and options $ (65,131 ) $ — $ (65,131 ) $ — Foreign exchange contracts $ (11,213 ) $ — $ (11,213 ) $ — RPAs $ (3 ) $ — $ (3 ) $ —
Schedule of assets measured at fair value on a nonrecurring basis	The following tables present the carrying amounts of assets included on the Consolidated Balance Sheets that had fair value changes measured on a nonrecurring basis: Assets Measured at Fair Value on a Nonrecurring Basis ($ in thousands) Fair Value Measurements Quoted Prices in Significant Significant Unobservable Inputs (Level 3) Non-PCI impaired loans: Commercial real estate (“CRE”) $ 10,042 $ — $ — $ 10,042 Commercial and industrial (“C&I”) 47,829 — — 47,829 Residential 2,522 — — 2,522 Consumer 610 — — 610 Total non-PCI impaired loans $ 61,003 $ — $ — $ 61,003 OREO $ 70 $ — $ — $ 70 Assets Measured at Fair Value on a Nonrecurring Basis ($ in thousands) Fair Value Measurements Quoted Prices in Significant Significant Unobservable Inputs (Level 3) Non-PCI impaired loans: CRE $ 14,908 $ — $ — $ 14,908 C&I 52,172 — — 52,172 Residential 2,464 — — 2,464 Consumer 610 — — 610 Total non-PCI impaired loans $ 70,154 $ — $ — $ 70,154 OREO $ 345 $ — $ — $ 345 Loans held-for-sale $ 22,703 $ — $ 22,703 $ —
Schedule of fair value adjustments of assets measured on a nonrecurring basis recognized	The following table presents the fair value adjustments of assets measured on a nonrecurring basis recognized during the three months ended and which were included on the Consolidated Balance Sheets as of March 31, 2017 and 2016 : Three Months Ended March 31, ($ in thousands) 2017 2016 Non-PCI impaired loans: CRE $ (64 ) $ 2,178 C&I 32 (1,935 ) Residential 82 (83 ) Consumer (1 ) 3 Total non-PCI impaired loans $ 49 $ 163 OREO $ (285 ) $ (461 ) Loans held-for-sale $ — $ (2,351 )
Schedule of the carrying and fair values per the fair value hierarchy of certain financial instruments	The following tables present the carrying and fair values per the fair value hierarchy of certain financial instruments, excluding those measured at fair value on a recurring basis, as of March 31, 2017 and December 31, 2016 : ($ in thousands) March 31, 2017 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 2,434,643 $ 2,434,643 $ — $ — $ 2,434,643 Interest-bearing deposits with banks $ 249,849 $ — $ 249,849 $ — $ 249,849 Resale agreements (1) $ 1,650,000 $ — $ 1,628,839 $ — $ 1,628,839 Held-to-maturity investment security $ 132,497 $ — $ — $ 133,656 $ 133,656 Loans held-for-sale $ 28,931 $ — $ 28,931 $ — $ 28,931 Loans held-for-investment, net $ 26,198,198 $ — $ — $ 25,825,039 $ 25,825,039 Restricted equity securities $ 73,019 $ — $ 73,019 $ — $ 73,019 Accrued interest receivable $ 102,067 $ — $ 102,067 $ — $ 102,067 Financial liabilities: Customer deposits: Demand, interest checking, savings and money market deposits $ 24,700,811 $ — $ 24,700,811 $ — $ 24,700,811 Time deposits $ 5,842,164 $ — $ 5,837,924 $ — $ 5,837,924 Short-term borrowings $ 42,023 $ — $ 42,023 $ — $ 42,023 FHLB advances $ 322,196 $ — $ 336,619 $ — $ 336,619 Repurchase agreements (1) $ 200,000 $ — $ 260,545 $ — $ 260,545 Long-term debt $ 181,388 $ — $ 182,502 $ — $ 182,502 Accrued interest payable $ 9,626 $ — $ 9,626 $ — $ 9,626 (1) Resale and repurchase agreements are reported net pursuant to ASC 210-20-45, Balance Sheet Offsetting . As of March 31, 2017 , $250.0 million out of $450.0 million of repurchase agreements was eligible for netting against resale agreements. ($ in thousands) December 31, 2016 Carrying Level 1 Level 2 Level 3 Estimated Financial assets: Cash and cash equivalents $ 1,878,503 $ 1,878,503 $ — $ — $ 1,878,503 Interest-bearing deposits with banks $ 323,148 $ — $ 323,148 $ — $ 323,148 Resale agreements (1) $ 2,000,000 $ — $ 1,980,457 $ — $ 1,980,457 Held-to-maturity investment security $ 143,971 $ — $ — $ 144,593 $ 144,593 Loans held-for-sale $ 23,076 $ — $ 23,076 $ — $ 23,076 Loans held-for-investment, net $ 25,242,619 $ — $ — $ 24,915,143 $ 24,915,143 Restricted equity securities $ 72,775 $ — $ 72,775 $ — $ 72,775 Accrued interest receivable $ 100,524 $ — $ 100,524 $ — $ 100,524 Financial liabilities: Customer deposits: Demand, interest checking, savings and money market deposits $ 24,275,714 $ — $ 24,275,714 $ — $ 24,275,714 Time deposits $ 5,615,269 $ — $ 5,611,746 $ — $ 5,611,746 Short-term borrowings $ 60,050 $ — $ 60,050 $ — $ 60,050 FHLB advances $ 321,643 $ — $ 334,859 $ — $ 334,859 Repurchase agreements (1) $ 350,000 $ — $ 411,368 $ — $ 411,368 Long-term debt $ 186,327 $ — $ 186,670 $ — $ 186,670 Accrued interest payable $ 9,440 $ — $ 9,440 $ — $ 9,440 (1) Resale and repurchase agreements are reported net pursuant to ASC 210-20-45, Balance Sheet Offsetting . As of December 31, 2016 , $100.0 million out of $450.0 million of repurchase agreements was eligible for netting against resale agreements.
Fair Value, Measurements, Nonrecurring
Quantitative information
Schedule of quantitative information about significant unobservable inputs used in the valuation of assets classified as Level 3	The following table presents the quantitative information about the significant unobservable inputs used in the valuation of assets measured on a nonrecurring basis classified as Level 3 as of March 31, 2017 and December 31, 2016 : ($ in thousands) Fair Value Valuation Unobservable Range of Inputs Weighted March 31, 2017 Non-PCI impaired loans $ 31,453 Discounted cash flow Discount 0% — 74% 11% $ 29,550 Market comparables Discount (1) 0% — 100% 7% OREO $ 70 Appraisal Selling cost 8% 8% December 31, 2016 Non-PCI impaired loans $ 31,835 Discounted cash flow Discount 0% — 62% 7% $ 38,319 Market comparables Discount (1) 0% — 100% 18% OREO $ 345 Appraisal Selling cost 8% 8% (1) Discount is adjusted for factors such as liquidation cost of collateral and selling cost.

Securities Purchased under Re26

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Tables)	3 Months Ended
	Mar. 31, 2017
Resale and Repurchase Agreements [Abstract]
Schedule of balance sheet offsetting for resale and repurchase agreements	The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheets as of March 31, 2017 and December 31, 2016 : ($ in thousands) As of March 31, 2017 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Financial Collateral Net Amount Resale agreements $ 1,900,000 $ (250,000 ) $ 1,650,000 $ (150,000 ) (1) $ (1,488,939 ) (2) $ 11,061 Gross Amounts Gross Amounts Net Amounts of on the Gross Amounts Not Offset on the Liabilities Financial Collateral Net Amount Repurchase agreements $ 450,000 $ (250,000 ) $ 200,000 $ (150,000 ) (1) $ (50,000 ) (3) $ — ($ in thousands) As of December 31, 2016 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Financial Collateral Net Amount Resale agreements $ 2,100,000 $ (100,000 ) $ 2,000,000 $ (150,000 ) (1) $ (1,839,120 ) (2) $ 10,880 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Liabilities Financial Collateral Net Amount Repurchase agreements $ 450,000 $ (100,000 ) $ 350,000 $ (150,000 ) (1) $ (200,000 ) (3) $ — (1) Represents financial instruments subject to enforceable master netting arrangements that are not eligible to be offset under ASC 210-20-45 but would be eligible for offsetting to the extent that an event of default has occurred. (2) Represents the fair value of securities the Company has received under resale agreements, limited for table presentation purposes to the amount of the recognized asset due from each counterparty. (3) Represents the fair value of securities the Company has pledged under repurchase agreements, limited for table presentation purposes to the amount of the recognized liability owed to each counterparty.

Securities (Tables)

Securities (Tables)	3 Months Ended
	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and fair value by major categories of investment securities	The following tables present as of March 31, 2017 and December 31, 2016 the amortized cost, gross unrealized gains and losses and fair value by major categories of available-for-sale investment securities, which are carried at fair value, and the held-to-maturity investment security, which is carried at amortized cost: As of March 31, 2017 ($ in thousands) Amortized Gross Gross Fair Available-for-sale investment securities: U.S. Treasury securities $ 709,332 $ 10 $ (8,482 ) $ 700,860 U.S. government agency and U.S. government sponsored enterprise debt securities 183,605 134 (2,876 ) 180,863 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 271,025 337 (6,840 ) 264,522 Residential mortgage-backed securities 1,185,382 3,855 (9,482 ) 1,179,755 Municipal securities 146,559 1,909 (1,399 ) 147,069 Non-agency residential mortgage-backed securities: Investment grade (1) 10,837 — (107 ) 10,730 Corporate debt securities: Investment grade (1) 2,476 — (222 ) 2,254 Non-investment grade (1) 10,191 — (1,007 ) 9,184 Foreign bonds: Investment grade (1) (2) 445,433 49 (19,614 ) 425,868 Other securities 40,593 853 (517 ) 40,929 Total available-for-sale investment securities $ 3,005,433 $ 7,147 $ (50,546 ) $ 2,962,034 Held-to-maturity investment security: Non-agency commercial mortgage-backed security $ 132,497 $ 1,159 $ — $ 133,656 Total investment securities $ 3,137,930 $ 8,306 $ (50,546 ) $ 3,095,690 As of December 31, 2016 ($ in thousands) Amortized Gross Gross Fair Available-for-sale investment securities: U.S. Treasury securities $ 730,287 $ 21 $ (9,829 ) $ 720,479 U.S. government agency and U.S. government sponsored enterprise debt securities 277,891 224 (3,249 ) 274,866 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 272,672 345 (6,218 ) 266,799 Residential mortgage-backed securities 1,266,372 3,924 (11,549 ) 1,258,747 Municipal securities 148,302 1,252 (1,900 ) 147,654 Non-agency residential mortgage-backed securities: Investment grade (1) 11,592 — (115 ) 11,477 Corporate debt securities: Investment grade (1) 222,190 562 (375 ) 222,377 Non-investment grade (1) 10,191 — (1,018 ) 9,173 Foreign bonds: Investment grade (1) (2) 405,443 30 (21,579 ) 383,894 Other securities 40,501 337 (509 ) 40,329 Total available-for-sale investment securities $ 3,385,441 $ 6,695 $ (56,341 ) $ 3,335,795 Held-to-maturity investment security: Non-agency commercial mortgage-backed security $ 143,971 $ 622 $ — $ 144,593 Total investment securities $ 3,529,412 $ 7,317 $ (56,341 ) $ 3,480,388 (1) Available-for-sale investment securities rated BBB- or higher by S&P or Baa3 or higher by Moody’s are considered investment grade. Conversely, available-for-sale investment securities rated lower than BBB- by S&P or lower than Baa3 by Moody’s are considered non-investment grade. Classifications are based on the lower of the credit ratings by S&P or Moody’s. (2) Fair values of foreign bonds include $395.5 million and $353.6 million of multilateral development bank bonds as of March 31, 2017 and December 31, 2016 , respectively.
Schedule of gross unrealized losses and related fair value of investment securities	The following tables present as of March 31, 2017 and December 31, 2016 the Company’s investment portfolio’s gross unrealized losses and related fair values, aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position: As of March 31, 2017 ($ in thousands) Less Than 12 Months 12 Months or More Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-sale investment securities: U.S. Treasury securities $ 680,801 $ (8,482 ) $ — $ — $ 680,801 $ (8,482 ) U.S. government agency and U.S. government sponsored enterprise debt securities 154,847 (2,876 ) — — 154,847 (2,876 ) U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 212,706 (5,879 ) 35,193 (961 ) 247,899 (6,840 ) Residential mortgage-backed securities 598,526 (8,151 ) 132,328 (1,331 ) 730,854 (9,482 ) Municipal securities 45,327 (1,006 ) 6,925 (393 ) 52,252 (1,399 ) Non-agency residential mortgage-backed securities: Investment grade 10,729 (107 ) — — 10,729 (107 ) Corporate debt securities: Investment grade — — 2,254 (222 ) 2,254 (222 ) Non-investment grade — — 9,184 (1,007 ) 9,184 (1,007 ) Foreign bonds: Investment grade 380,530 (19,409 ) 9,795 (205 ) 390,325 (19,614 ) Other securities 31,013 (517 ) — — 31,013 (517 ) Total available-for-sale investment securities $ 2,114,479 $ (46,427 ) $ 195,679 $ (4,119 ) $ 2,310,158 $ (50,546 ) Held-to-maturity investment security: Non-agency commercial mortgage-backed security $ — $ — $ — $ — $ — $ — Total investment securities $ 2,114,479 $ (46,427 ) $ 195,679 $ (4,119 ) $ 2,310,158 $ (50,546 ) As of December 31, 2016 ($ in thousands) Less Than 12 Months 12 Months or More Total Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Fair Value Gross Unrealized Losses Available-for-sale investment securities: U.S. Treasury securities $ 670,268 $ (9,829 ) $ — $ — $ 670,268 $ (9,829 ) U.S. government agency and U.S. government sponsored enterprise debt securities 203,901 (3,249 ) — — 203,901 (3,249 ) U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 202,106 (5,452 ) 29,201 (766 ) 231,307 (6,218 ) Residential mortgage-backed securities 629,324 (9,594 ) 119,603 (1,955 ) 748,927 (11,549 ) Municipal securities 57,655 (1,699 ) 2,692 (201 ) 60,347 (1,900 ) Non-agency residential mortgage-backed securities: Investment grade 5,033 (101 ) 6,444 (14 ) 11,477 (115 ) Corporate debt securities: Investment grade — — 71,667 (375 ) 71,667 (375 ) Non-investment grade — — 9,173 (1,018 ) 9,173 (1,018 ) Foreign bonds: Investment grade 363,618 (21,327 ) 14,258 (252 ) 377,876 (21,579 ) Other securities 30,991 (509 ) — — 30,991 (509 ) Total available-for-sale investment securities $ 2,162,896 $ (51,760 ) $ 253,038 $ (4,581 ) $ 2,415,934 $ (56,341 ) Held-to-maturity investment security: Non-agency commercial mortgage-backed security $ — $ — $ — $ — $ — $ — Total investment securities $ 2,162,896 $ (51,760 ) $ 253,038 $ (4,581 ) $ 2,415,934 $ (56,341 )
Schedule of the proceeds, gross realized gains and losses related to the sales of available-for-sale investment securities	The following table presents the proceeds, gross realized gains and losses, and tax expense related to the sales of available-for-sale investment securities for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 2016 Proceeds from sales $ 302,656 $ 652,753 Gross realized gains $ 2,474 $ 3,967 Gross realized losses $ — $ 125 Related tax expense $ 1,040 $ 1,616
Schedule of maturities of investment securities	The following table presents the scheduled maturities of available-for-sale investment securities as of March 31, 2017 : ($ in thousands) Amortized Cost Estimated Fair Value Due within one year $ 519,223 $ 503,271 Due after one year through five years 878,436 867,870 Due after five years through ten years 241,665 236,183 Due after ten years 1,366,109 1,354,710 Total available-for-sale investment securities $ 3,005,433 $ 2,962,034 The following table presents the scheduled maturity of the held-to-maturity investment security as of March 31, 2017 : ($ in thousands) Amortized Cost Estimated Fair Value Due after ten years $ 132,497 $ 133,656
Schedule of restricted equity securities	The following table presents the restricted equity securities as of March 31, 2017 and December 31, 2016 : ($ in thousands) March 31, 2017 December 31, 2016 Federal Reserve Bank stock $ 17,250 $ 17,250 FHLB stock 55,769 55,525 Total $ 73,019 $ 72,775

Derivatives (Tables)

Derivatives (Tables)	3 Months Ended
	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of notional and fair values of derivatives	The following table presents the total notional and fair values of the Company’s derivatives as of March 31, 2017 and December 31, 2016 : ($ in thousands) March 31, 2017 December 31, 2016 Notional Amount Fair Value Notional Amount Fair Value Derivative Assets (1) Derivative Liabilities (1) Derivative Assets (1) Derivative Liabilities (1) Derivatives designated as hedging instruments: Interest rate swaps on certificates of deposit $ 48,365 $ — $ 6,793 $ 48,365 $ — $ 5,976 Foreign currency forward contracts — — — 83,026 4,325 — Total derivatives designated as hedging instruments $ 48,365 $ — $ 6,793 $ 131,391 $ 4,325 $ 5,976 Derivatives not designated as hedging instruments: Interest rate swaps and options $ 7,831,456 $ 61,586 $ 60,204 $ 7,668,482 $ 67,578 $ 65,131 Foreign exchange contracts 1,267,282 8,220 7,357 767,764 11,874 11,213 RPAs 71,396 3 2 71,414 3 3 Total derivatives not designated as hedging instruments $ 9,170,134 $ 69,809 $ 67,563 $ 8,507,660 $ 79,455 $ 76,347 (1) Derivative assets and derivative liabilities are included in Other assets and Accrued expenses and other liabilities, respectively, on the Consolidated Balance Sheets.
Schedule of net gains (losses) recognized on the Consolidated Statements of Income related to derivatives designated as fair value hedge	The following table presents the net (losses) gains recognized on the Consolidated Statements of Income related to the derivatives designated as fair value hedges for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended 2017 2016 (Losses) gains recorded in interest expense: Recognized on interest rate swaps $ (817 ) $ 4,229 Recognized on certificates of deposit $ 688 $ (3,356 )
Schedule of gains (losses) related to net investment hedges in accumulated other comprehensive income (loss) and Consolidated Statements of Income	The following table presents the losses recorded in the Foreign currency translation adjustment account within AOCI related to the effective portion of the net investment hedges and the ineffectiveness recorded on the Consolidated Statements of Income for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended 2017 2016 Losses recognized in AOCI on net investment hedges (effective portion) $ 648 $ 1,485 Losses recognized in foreign exchange income (ineffective portion) $ 1,953 $ 880
Schedule of net gains (losses) recognized on the Consolidated Statements of Income related to derivatives not designated as hedging instruments	The following table presents the net gains (losses) recognized on the Company’s Consolidated Statements of Income related to derivatives not designated as hedging instruments for the three months ended March 31, 2017 and 2016 : ($ in thousands) Location in Consolidated Statements of Income Three Months Ended 2017 2016 Derivatives not designated as hedging instruments: Interest rate swaps and options Derivative fees and other income $ (1,066 ) $ (711 ) Foreign exchange contracts Foreign exchange income 5,838 2,828 RPAs Derivative fees and other income 1 (11 ) Net gains $ 4,773 $ 2,106
Schedule of gross derivatives on the Consolidated Balance Sheets and the respective collateral received or pledged in the form of other financial instruments	The following tables present gross derivatives on the Consolidated Balance Sheets and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities and/or cash. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability (after netting is applied); thus instances of overcollateralization are not shown: ($ in thousands) As of March 31, 2017 Total Contracts Not Subject to Master Netting Arrangements Contracts Subject to Master Netting Arrangements Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts Net Amounts Gross Amounts Not Offset on the Derivative Amount Collateral Net Amount Derivatives Assets $ 69,809 $ 44,570 $ 25,239 $ — $ 25,239 $ (20,964 ) (1) $ (4,162 ) (2) $ 113 Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts Net Amounts Gross Amounts Not Offset on the Derivative Amount Collateral Net Amount Derivatives Liabilities $ 74,356 $ 22,699 $ 51,657 $ — $ 51,657 $ (20,964 ) (1) $ (29,833 ) (3) $ 860 ($ in thousands) As of December 31, 2016 Total Contracts Not Subject to Master Netting Arrangements Contracts Subject to Master Netting Arrangements Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts Offset on the Consolidated Balance Sheets Net Amounts Gross Amounts Not Offset on the Derivative Collateral Net Amount Derivatives Assets $ 83,780 $ 51,218 $ 32,562 $ — $ 32,562 $ (20,991 ) (1) $ (10,687 ) (2) $ 884 Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts of Recognized Gross Amounts Offset on the Consolidated Balance Sheets Net Amounts Gross Amounts Not Offset on the Derivative Collateral Net Amount Derivatives Liabilities $ 82,323 $ 24,097 $ 58,226 $ — $ 58,226 $ (20,991 ) (1) $ (36,349 ) (3) $ 886 (1) Represents the netting of derivative receivable and payable balances for the same counterparty under enforceable master netting arrangements if the Company has elected to net. (2) Represents $1.0 million and $8.1 million of cash collateral received against derivative assets with the same counterparty that are subject to enforceable master netting arrangements as of March 31, 2017 and December 31, 2016 , respectively. (3) Represents cash and securities pledged against derivative liabilities with the same counterparty that are subject to enforceable master netting arrangements. Includes approximately $1.2 million and $170 thousand of cash collateral posted as of March 31, 2017 and December 31, 2016 , respectively.

Loans Receivable and Allowanc29

Loans Receivable and Allowance for Credit Losses (Tables)	3 Months Ended
	Mar. 31, 2017
Loans and Leases Receivable Disclosure [Abstract]
Schedule of composition of non-PCI and PCI loans	The following table presents the composition of the Company’s non-PCI and PCI loans as of March 31, 2017 and December 31, 2016 : ($ in thousands) March 31, 2017 December 31, 2016 Non-PCI Loans (1) PCI Loans (2) Total (1)(2) Non-PCI Loans (1) PCI Loans (2) Total (1)(2) CRE: Income producing $ 7,964,224 $ 337,874 $ 8,302,098 $ 7,667,661 $ 348,448 $ 8,016,109 Construction 562,560 — 562,560 551,560 — 551,560 Land 120,885 1,347 122,232 121,276 1,918 123,194 Total CRE 8,647,669 339,221 8,986,890 8,340,497 350,366 8,690,863 C&I: Commercial business 9,176,747 32,110 9,208,857 8,921,246 38,387 8,959,633 Trade finance 709,215 — 709,215 680,930 — 680,930 Total C&I 9,885,962 32,110 9,918,072 9,602,176 38,387 9,640,563 Residential: Single-family 3,566,739 133,333 3,700,072 3,370,669 139,110 3,509,779 Multifamily 1,643,167 89,528 1,732,695 1,490,285 95,654 1,585,939 Total residential 5,209,906 222,861 5,432,767 4,860,954 234,764 5,095,718 Consumer 2,106,091 17,472 2,123,563 2,057,067 18,928 2,075,995 Total loans held-for-investment $ 25,849,628 $ 611,664 $ 26,461,292 $ 24,860,694 $ 642,445 $ 25,503,139 Allowance for loan losses (263,007 ) (87 ) (263,094 ) (260,402 ) (118 ) (260,520 ) Loans held-for-investment, net $ 25,586,621 $ 611,577 $ 26,198,198 $ 24,600,292 $ 642,327 $ 25,242,619 (1) Includes $(4.7) million and $1.2 million as of March 31, 2017 and December 31, 2016 , respectively, of net deferred loan fees, unamortized premiums and unaccreted discounts. (2) Loans net of ASC 310-30 discount.
Summary of credit risk rating for non-PCI and PCI loans by portfolio segment	The following tables present the credit risk rating for non-PCI loans by portfolio segment as of March 31, 2017 and December 31, 2016 : March 31, 2017 ($ in thousands) Pass/Watch Special Mention Substandard Doubtful Loss Total CRE: Income producing $ 7,800,487 $ 23,362 $ 140,375 $ — $ — $ 7,964,224 Construction 530,278 32,282 — — — 562,560 Land 109,013 — 11,872 — — 120,885 C&I: Commercial business 8,827,318 139,251 185,249 24,929 — 9,176,747 Trade finance 677,654 3,566 27,995 — — 709,215 Residential: Single-family 3,533,047 8,693 24,999 — — 3,566,739 Multifamily 1,619,193 1,284 22,690 — — 1,643,167 Consumer 2,087,485 6,907 11,699 — — 2,106,091 Total $ 25,184,475 $ 215,345 $ 424,879 $ 24,929 $ — $ 25,849,628 December 31, 2016 ($ in thousands) Pass/Watch Special Mention Substandard Doubtful Loss Total Non-PCI Loans CRE: Income producing $ 7,476,804 $ 29,005 $ 161,852 $ — $ — $ 7,667,661 Construction 551,560 — — — — 551,560 Land 107,976 — 13,290 10 — 121,276 C&I: Commercial business 8,559,674 155,276 201,139 5,157 — 8,921,246 Trade finance 635,027 9,435 36,460 — 8 680,930 Residential: Single-family 3,341,015 10,179 19,475 — — 3,370,669 Multifamily 1,462,522 2,268 25,495 — — 1,490,285 Consumer 2,043,405 6,764 6,898 — — 2,057,067 Total $ 24,177,983 $ 212,927 $ 464,609 $ 5,167 $ 8 $ 24,860,694 The following tables present the credit risk rating for PCI loans by portfolio segment as of March 31, 2017 and December 31, 2016 : March 31, 2017 ($ in thousands) Pass/Watch Special Mention Substandard Total PCI Loans CRE: Income producing $ 282,099 $ 573 $ 55,202 $ 337,874 Land 1,012 — 335 1,347 C&I: Commercial business 27,884 680 3,546 32,110 Residential: Single-family 130,031 1,522 1,780 133,333 Multifamily 80,510 — 9,018 89,528 Consumer 15,559 374 1,539 17,472 Total (1) $ 537,095 $ 3,149 $ 71,420 $ 611,664 December 31, 2016 ($ in thousands) Pass/Watch Special Mention Substandard Total PCI Loans CRE: Income producing $ 293,529 $ 3,239 $ 51,680 $ 348,448 Land 1,562 — 356 1,918 C&I: Commercial business 33,885 772 3,730 38,387 Residential: Single-family 136,245 1,239 1,626 139,110 Multifamily 86,190 — 9,464 95,654 Consumer 17,433 316 1,179 18,928 Total (1) $ 568,844 $ 5,566 $ 68,035 $ 642,445 (1) Loans net of ASC 310-30 discount.
Schedule of aging analysis on non-PCI loans	The following tables present the aging analysis on non-PCI loans as of March 31, 2017 and December 31, 2016 : March 31, 2017 ($ in thousands) Accruing Loans 30-59 Days Past Due Accruing Loans 60-89 Days Past Due Total Accruing Past Due Loans Nonaccrual Loans Less Than 90 Days Past Due Nonaccrual Loans 90 or More Days Past Due Total Nonaccrual Loans Current Accruing Loans Total Non-PCI Loans CRE: Income producing $ 3,132 $ — $ 3,132 $ 11,596 $ 22,120 $ 33,716 $ 7,927,376 $ 7,964,224 Construction — — — — — — 562,560 562,560 Land — — — 47 4,453 4,500 116,385 120,885 C&I: Commercial business 8,478 5 8,483 47,238 44,855 92,093 9,076,171 9,176,747 Trade finance — — — — — — 709,215 709,215 Residential: Single-family 2,211 5,246 7,457 — 5,643 5,643 3,553,639 3,566,739 Multifamily 4,801 904 5,705 1,030 1,192 2,222 1,635,240 1,643,167 Consumer 3,352 444 3,796 156 2,825 2,981 2,099,314 2,106,091 Total $ 21,974 $ 6,599 $ 28,573 $ 60,067 $ 81,088 $ 141,155 $ 25,679,900 $ 25,849,628 December 31, 2016 ($ in thousands) Accruing Loans 30-59 Days Past Due Accruing Loans 60-89 Days Past Due Total Accruing Past Due Loans Nonaccrual Loans Less Than 90 Days Past Due Nonaccrual Loans 90 or More Days Past Due Total Nonaccrual Loans Current Accruing Loans Total CRE: Income producing $ 6,233 $ 14,080 $ 20,313 $ 14,872 $ 12,035 $ 26,907 $ 7,620,441 $ 7,667,661 Construction 4,994 — 4,994 — — — 546,566 551,560 Land — — — 433 4,893 5,326 115,950 121,276 C&I: Commercial business 45,052 2,279 47,331 60,511 20,737 81,248 8,792,667 8,921,246 Trade finance — — — 8 — 8 680,922 680,930 Residential: Single-family 9,595 8,076 17,671 — 4,214 4,214 3,348,784 3,370,669 Multifamily 3,951 374 4,325 2,790 194 2,984 1,482,976 1,490,285 Consumer 3,327 3,228 6,555 165 1,965 2,130 2,048,382 2,057,067 Total $ 73,152 $ 28,037 $ 101,189 $ 78,779 $ 44,038 $ 122,817 $ 24,636,688 $ 24,860,694
Summary of additions and modifications to non-PCI troubled debt restructurings	The following table presents the additions to non-PCI TDRs for the three months ended March 31, 2017 and 2016 : Loans Modified as TDRs During the Three Months Ended March 31, ($ in thousands) 2017 2016 Number Pre- Modification Post- Modification (1) Financial (2) Number Pre- Modification Post- Modification (1) Financial (2) CRE: Income producing 1 $ 1,526 $ 1,505 $ — 2 $ 13,775 $ 13,758 $ — Land 2 $ 86 $ — $ — — $ — $ — $ — C&I: Commercial business 2 $ 6,448 $ 4,914 $ 1,273 4 $ 21,614 $ 18,577 $ 97 Trade finance — $ — $ — $ — 2 $ 7,901 $ 8,082 $ — Residential: Single-family — $ — $ — $ — 1 $ 276 $ 272 $ — Consumer — $ — $ — $ — 1 $ 344 $ 345 $ 1 (1) Includes subsequent payments after modification and reflects the balance as of March 31, 2017 and 2016 . (2) The financial impact includes charge-offs and specific reserves recorded at the modification date. The following table presents the non-PCI TDR modifications for the three months ended March 31, 2017 and 2016 by modification type: ($ in thousands) Modification Type During the Three Month Ended March 31, 2017 2016 Principal (1) Principal and Interest (2) Interest Rate Reduction Other Total Principal (1) Principal and Interest (2) Interest Rate Reduction Other Total CRE $ 1,505 $ — $ — $ — $ 1,505 $ 13,730 $ — $ — $ 28 $ 13,758 C&I — 4,914 — — 4,914 19,112 — 3,615 3,932 26,659 Residential — — — — — 272 — — — 272 Consumer — — — — — 345 — — — 345 Total $ 1,505 $ 4,914 $ — $ — $ 6,419 $ 33,459 $ — $ 3,615 $ 3,960 $ 41,034 (1) Includes forbearance payments, term extensions and principal deferments that modify the terms of the loan from principal and interest payments to interest payments only. (2) Includes principal and interest deferments or reductions. The following table presents information for loans modified as TDRs within the previous 12 months that have subsequently defaulted during the three months ended March 31, 2017 and 2016 , and were still in default at the respective period end: Loans Modified as TDRs that Subsequently Defaulted During the Three Months Ended March 31, 2017 2016 ($ in thousands) Number of Recorded Number of Recorded C&I: Commercial business 1 $ 2,718 4 $ 966
Summary of non-PCI impaired loans	The following tables present information on the non-PCI impaired loans as of March 31, 2017 and December 31, 2016 : March 31, 2017 ($ in thousands) Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance CRE: Income producing $ 48,832 $ 34,984 $ 9,528 $ 44,512 $ 1,159 Land 5,050 4,453 47 4,500 6 C&I: Commercial business 182,965 101,963 34,031 135,994 6,218 Trade finance 3,449 3,438 — 3,438 — Residential: Single-family 16,132 1,864 13,172 15,036 611 Multifamily 10,132 5,649 3,575 9,224 121 Consumer 4,897 670 3,855 4,525 32 Total $ 271,457 $ 153,021 $ 64,208 $ 217,229 $ 8,147 December 31, 2016 ($ in thousands) Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance CRE: Income producing $ 50,718 $ 32,507 $ 14,001 $ 46,508 $ 1,263 Land 6,457 5,427 443 5,870 63 C&I: Commercial business 162,239 78,316 42,137 120,453 10,443 Trade finance 5,227 — 5,166 5,166 34 Residential: Single-family 15,435 — 14,335 14,335 687 Multifamily 11,181 5,684 4,357 10,041 180 Consumer 4,016 — 3,682 3,682 31 Total $ 255,273 $ 121,934 $ 84,121 $ 206,055 $ 12,701
Schedule of average recorded investment and interest income recognized on non-PCI impaired loans	The following table presents the average recorded investment and interest income recognized on non-PCI impaired loans during the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 2016 Average Recorded Investment Recognized Interest Income (1) Average Recognized Interest Income (1) CRE: Income producing $ 44,772 $ 35 $ 71,767 $ 391 Land 4,717 — 6,952 9 C&I: Commercial business 138,931 214 94,505 369 Trade finance 4,283 7 13,737 66 Residential: Single-family 15,096 22 18,356 65 Multifamily 9,269 38 22,345 77 Consumer 4,533 12 1,638 16 Total non-PCI impaired loans $ 221,601 $ 328 $ 229,300 $ 993 (1) Includes interest recognized on accruing non-PCI TDRs. Interest payments received on nonaccrual non-PCI loans are reflected as a reduction to principal and not as interest income.
Summary of activities in the allowance for credit losses	The following tables present a summary of activities in the allowance for loan losses by portfolio segment for the three months ended March 31, 2017 and 2016 : Three Months Ended March 31, 2017 ($ in thousands) Non-PCI Loans PCI Loans CRE C&I Residential Consumer Total Total Beginning balance $ 72,804 $ 142,166 $ 37,333 $ 8,099 $ 260,402 $ 118 $ 260,520 Provision for (reversal of) loan losses 1,639 1,946 3,835 626 8,046 (31 ) 8,015 Charge-offs (148 ) (7,057 ) — (4 ) (7,209 ) — (7,209 ) Recoveries 593 455 578 142 1,768 — 1,768 Net recoveries (charge-offs) 445 (6,602 ) 578 138 (5,441 ) — (5,441 ) Ending balance $ 74,888 $ 137,510 $ 41,746 $ 8,863 $ 263,007 $ 87 $ 263,094 Three Months Ended March 31, 2016 ($ in thousands) Non-PCI Loans PCI Loans Total CRE C&I Residential Consumer Total Beginning balance $ 81,191 $ 134,597 $ 39,292 $ 9,520 $ 264,600 $ 359 $ 264,959 Provision for (reversal of) loan losses 1,306 4,654 (5,317 ) (226 ) 417 (31 ) 386 Charge-offs (56 ) (5,860 ) (137 ) (1 ) (6,054 ) — (6,054 ) Recoveries 97 686 97 67 947 — 947 Net recoveries (charge-offs) 41 (5,174 ) (40 ) 66 (5,107 ) — (5,107 ) Ending balance $ 82,538 $ 134,077 $ 33,935 $ 9,360 $ 259,910 $ 328 $ 260,238 The following table presents a summary of activities in the allowance for unfunded credit reserves during the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended 2017 2016 Beginning balance $ 16,121 $ 20,360 (Reversal of) provision for unfunded credit reserves (947 ) 1,054 Ending balance $ 15,174 $ 21,414
Summary of allowance for loan losses and recorded investments by portfolio segment and impairment methodology	The following tables present the Company’s allowance for loan losses and recorded investments by portfolio segment and impairment methodology as of March 31, 2017 and December 31, 2016 : March 31, 2017 ($ in thousands) CRE C&I Residential Consumer Total Allowance for loan losses Individually evaluated for impairment $ 1,165 $ 6,218 $ 732 $ 32 $ 8,147 Collectively evaluated for impairment 73,723 131,292 41,014 8,831 254,860 Acquired with deteriorated credit quality 86 — 1 — 87 Ending balance $ 74,974 $ 137,510 $ 41,747 $ 8,863 $ 263,094 Recorded investment in loans Individually evaluated for impairment $ 49,012 $ 139,432 $ 24,260 $ 4,525 $ 217,229 Collectively evaluated for impairment 8,598,657 9,746,530 5,185,646 2,101,566 25,632,399 Acquired with deteriorated credit quality (1) 339,221 32,110 222,861 17,472 611,664 Ending balance (1) $ 8,986,890 $ 9,918,072 $ 5,432,767 $ 2,123,563 $ 26,461,292 December 31, 2016 ($ in thousands) CRE C&I Residential Consumer Total Allowance for loan losses Individually evaluated for impairment $ 1,326 $ 10,477 $ 867 $ 31 $ 12,701 Collectively evaluated for impairment 71,478 131,689 36,466 8,068 247,701 Acquired with deteriorated credit quality 112 1 5 — 118 Ending balance $ 72,916 $ 142,167 $ 37,338 $ 8,099 $ 260,520 Recorded investment in loans Individually evaluated for impairment $ 52,378 $ 125,619 $ 24,376 $ 3,682 $ 206,055 Collectively evaluated for impairment 8,288,119 9,476,557 4,836,578 2,053,385 24,654,639 Acquired with deteriorated credit quality (1) 350,366 38,387 234,764 18,928 642,445 Ending balance (1) $ 8,690,863 $ 9,640,563 $ 5,095,718 $ 2,075,995 $ 25,503,139 (1) Loans net of ASC 310-30 discount.
Summary of changes in accretable yield for PCI loans	The following table presents the changes in accretable yield for PCI loans for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 2016 Beginning balance $ 136,247 $ 214,907 Accretion (10,279 ) (22,429 ) Changes in expected cash flows 2,022 (6,487 ) Ending balance $ 127,990 $ 185,991

Investments in Qualified Affo30

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Tables)	3 Months Ended
	Mar. 31, 2017
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net [Abstract]
Schedule of investments in qualified affordable housing partnerships, net and related unfunded commitments	The following table presents the balances of the Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of the periods indicated: ($ in thousands) March 31, 2017 December 31, 2016 Investments in qualified affordable housing partnerships, net $ 176,965 $ 183,917 Accrued expenses and other liabilities — Unfunded commitments $ 52,223 $ 57,243
Schedule of additional information related to investments in qualified affordable housing partnerships, net	The following table presents additional information related to the Company’s investments in qualified affordable housing partnerships, net, for the periods indicated: ($ in thousands) Three Months Ended 2017 2016 Tax credits and other tax benefits recognized $ 9,621 $ 9,452 Amortization expense included in income tax expense $ 6,950 $ 6,966

Goodwill and Other Intangible31

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of finite-lived intangible assets	The following table presents the gross carrying value of intangible assets and accumulated amortization as of March 31, 2017 and December 31, 2016 : ($ in thousands) March 31, 2017 December 31, 2016 Gross balance $ 108,814 $ 108,814 Accumulated amortization 82,642 80,825 Net carrying balance $ 26,172 $ 27,989
Schedule of estimated future amortization expense of core deposit intangibles	The following table presents the estimated future amortization expense of core deposit intangibles: Year Ended December 31, Amount ($ in thousands) Remainder of 2017 $ 5,118 2018 5,883 2019 4,864 2020 3,846 2021 2,833 Thereafter 3,628 Total $ 26,172

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Schedule of credit-related commitments	The following table presents the Company’s credit-related commitments as of the periods indicated: ($ in thousands) March 31, 2017 December 31, 2016 Loan commitments $ 5,007,903 $ 5,077,869 Commercial letters of credit and SBLCs $ 1,695,083 $ 1,525,613

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	3 Months Ended
	Mar. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of stock compensation expense and related net tax benefit	The following table presents a summary of the total share-based compensation expense and the related net tax benefit associated with the Company’s various employee share-based compensation plans for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended 2017 2016 Stock compensation costs $ 5,151 $ 4,575 Related net tax benefit for stock compensation plans $ 4,414 $ 986
Summary of activity for time-based and performance-based restricted stock units	The following table presents a summary of the activity for the Company’s time-based and performance-based RSUs for the three months ended March 31, 2017 based on the target amount of awards: Three Months Ended March 31, 2017 Time-Based RSUs Performance-Based RSUs Shares Weighted Average Grant-Date Fair Value Shares Weighted Average Grant-Date Fair Value Outstanding at beginning of period 1,218,714 $ 35.92 410,746 $ 35.27 Granted 330,762 54.49 131,597 56.59 Vested (279,549 ) 36.84 (118,044 ) 36.85 Forfeited (61,193 ) 39.25 — — Outstanding at end of period 1,208,734 $ 40.62 424,299 $ 41.44

Stockholders' Equity and Earn34

Stockholders' Equity and Earnings Per Share (Tables)	3 Months Ended
	Mar. 31, 2017
Stockholders' Equity and Earnings Per Share [Abstract]
Schedule of earnings per share calculations	The following table presents the EPS calculations for the three months ended March 31, 2017 and 2016 : Three Months Ended ($ and shares in thousands, except per share data) 2017 2016 Basic Net income $ 169,736 $ 107,516 Basic weighted average number of shares outstanding 144,249 143,958 Basic EPS $ 1.18 $ 0.75 Diluted Net income $ 169,736 $ 107,516 Basic weighted average number of shares outstanding 144,249 143,958 Diluted potential common shares (1) 1,483 845 Diluted weighted average number of shares outstanding 145,732 144,803 Diluted EPS $ 1.16 $ 0.74 (1) Includes dilutive shares from RSUs and warrants for the three months ended March 31, 2017 and 2016 .

Accumulated Other Comprehensi35

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2017
Equity [Abstract]
Schedule of the changes in components of accumulated other comprehensive income (loss) balances	The following table presents the changes in the components of AOCI balances for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 2016 Available- Foreign (1) Total Available- Foreign (1) Total Beginning balance $ (28,772 ) $ (19,374 ) $ (48,146 ) $ (6,144 ) $ (8,797 ) $ (14,941 ) Net unrealized gains (losses) arising during the period 5,055 1,007 6,062 15,142 (33 ) 15,109 Amounts reclassified from AOCI (1,434 ) — (1,434 ) (2,226 ) — (2,226 ) Changes, net of taxes 3,621 1,007 4,628 12,916 (33 ) 12,883 Ending balance $ (25,151 ) $ (18,367 ) $ (43,518 ) $ 6,772 $ (8,830 ) $ (2,058 ) (1) Represents foreign currency translation adjustments related to the Company’s net investment in non-U.S. operations, including related hedges. The functional currency and reporting currency of the Company’s foreign subsidiary was Chinese Renminbi and USD, respectively.
Schedule of components of other comprehensive income, reclassifications to net income and the related tax effects	The following table presents the components of other comprehensive income, reclassifications to net income and the related tax effects for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 2016 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax Available-for-sale investment securities: Net unrealized gains arising during the period $ 8,721 $ (3,666 ) $ 5,055 $ 26,130 $ (10,988 ) $ 15,142 Net realized gains reclassified into net income (1) (2,474 ) 1,040 (1,434 ) (3,842 ) 1,616 (2,226 ) Net change 6,247 (2,626 ) 3,621 22,288 (9,372 ) 12,916 Foreign currency translation adjustments: Net unrealized gains (losses) arising during period 1,007 — 1,007 (33 ) — (33 ) Net change 1,007 — 1,007 (33 ) — (33 ) Other comprehensive income $ 7,254 $ (2,626 ) $ 4,628 $ 22,255 $ (9,372 ) $ 12,883 (1) For the three months ended March 31, 2017 and 2016 , the pretax amounts were reported in Net gains on sales of available-for-sale investment securities on the Consolidated Statements of Income.

Business Segments (Tables)

Business Segments (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Schedule of operating results and other key financial measures by operating segments	The following tables present the operating results and other key financial measures for the individual operating segments as of and for the three months ended March 31, 2017 and 2016 : ($ in thousands) Three Months Ended March 31, 2017 Retail Banking Commercial Banking Other Total Interest income $ 81,648 $ 191,796 $ 29,225 $ 302,669 Charge for funds used (27,860 ) (64,387 ) (28,167 ) (120,414 ) Interest spread on funds used 53,788 127,409 1,058 182,255 Interest expense (16,173 ) (5,108 ) (9,266 ) (30,547 ) Credit on funds provided 102,528 12,061 5,825 120,414 Interest spread on funds provided 86,355 6,953 (3,441 ) 89,867 Net interest income (loss) before provision for credit losses $ 140,143 $ 134,362 $ (2,383 ) $ 272,122 Provision for credit losses $ 381 $ 6,687 $ — $ 7,068 Depreciation, amortization and (accretion), net $ 2,344 $ (3,474 ) $ 29,260 $ 28,130 Segment income before income taxes $ 73,361 $ 91,798 $ 62,845 $ 228,004 As of March 31, 2017: Goodwill $ 357,207 $ 112,226 $ — $ 469,433 Segment assets $ 8,213,268 $ 19,624,237 $ 7,504,621 $ 35,342,126 ($ in thousands) Three Months Ended March 31, 2016 Retail Commercial Other Total Interest income $ 77,371 $ 177,082 $ 21,719 $ 276,172 Charge for funds used (22,652 ) (53,791 ) (11,837 ) (88,280 ) Interest spread on funds used 54,719 123,291 9,882 187,892 Interest expense (14,606 ) (4,026 ) (5,336 ) (23,968 ) Credit on funds provided 72,431 9,977 5,872 88,280 Interest spread on funds provided 57,825 5,951 536 64,312 Net interest income before provision for credit losses $ 112,544 $ 129,242 $ 10,418 $ 252,204 (Reversal of) provision for credit losses $ (1,582 ) $ 3,022 $ — $ 1,440 Depreciation, amortization and (accretion), net $ 43 $ (10,773 ) $ 23,488 $ 12,758 Segment income before income taxes $ 45,945 $ 92,829 $ 5,897 $ 144,671 As of March 31, 2016: Goodwill $ 357,207 $ 112,226 $ — $ 469,433 Segment assets $ 7,203,470 $ 17,939,537 $ 7,966,162 $ 33,109,169

Basis of Presentation (Details)

Basis of Presentation (Details)	Mar. 31, 2017trust
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of wholly-owned subsidiaries that are statutory business trusts (the Trusts)	6

Current Accounting Developmen38

Current Accounting Developments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Accounting Policies [Abstract]
Net excess tax benefits for restricted stock units	$ 4.4

Disposition of Commercial Pro39

Disposition of Commercial Property (Details) - Commercial Property in San Francisco $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)$ / shares
Sale Leaseback Transaction [Line Items]
Sale price	$ 120.6
Pre-tax profit from sale	85.4
Current period gain recognized	71.7
Deferred gain	$ 13.7
Impact from sale on diluted EPS (in dollars per share) | $ / shares	$ 0.28

Fair Value Measurement and Fa40

Fair Value Measurement and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investment securities available-for-sale
Available-for-sale investment securities	$ 2,962,034	$ 3,335,795
Derivative
Derivative assets	69,809	83,780
Derivative liabilities	(74,356)	(82,323)
U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	700,860	720,479
U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	180,863	274,866
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	264,522	266,799
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	1,179,755	1,258,747
Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	147,069	147,654
Non-agency residential mortgage-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	10,730	11,477
Corporate debt securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	2,254	222,377
Corporate debt securities | Non-investment grade
Investment securities available-for-sale
Available-for-sale investment securities	9,184	9,173
Foreign bonds | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	425,868	383,894
Other securities
Investment securities available-for-sale
Available-for-sale investment securities	40,929	40,329
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Investment securities available-for-sale
Available-for-sale investment securities	731,935	751,470
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	700,860	720,479
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Other securities
Investment securities available-for-sale
Available-for-sale investment securities	31,075	30,991
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Investment securities available-for-sale
Available-for-sale investment securities	2,230,099	2,584,325
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and options
Derivative
Derivative assets	61,586	67,578
Derivative liabilities	(60,204)	(65,131)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange contracts
Derivative
Derivative assets	8,220	11,874
Derivative liabilities	(7,357)	(11,213)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | RPAs
Derivative
Derivative assets	3	3
Derivative liabilities	(2)	(3)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps on certificates of deposit
Derivative
Derivative liabilities	(6,793)	(5,976)
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign currency forward contracts
Derivative
Derivative assets		4,325
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	180,863	274,866
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	264,522	266,799
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	1,179,755	1,258,747
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	147,069	147,654
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Non-agency residential mortgage-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	10,730	11,477
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	2,254	222,377
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Corporate debt securities | Non-investment grade
Investment securities available-for-sale
Available-for-sale investment securities	9,184	9,173
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign bonds | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	425,868	383,894
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other securities
Investment securities available-for-sale
Available-for-sale investment securities	9,854	9,338
Fair Value, Measurements, Recurring | Estimated Fair Value
Investment securities available-for-sale
Available-for-sale investment securities	2,962,034	3,335,795
Fair Value, Measurements, Recurring | Estimated Fair Value | Interest rate swaps and options
Derivative
Derivative assets	61,586	67,578
Derivative liabilities	(60,204)	(65,131)
Fair Value, Measurements, Recurring | Estimated Fair Value | Foreign exchange contracts
Derivative
Derivative assets	8,220	11,874
Derivative liabilities	(7,357)	(11,213)
Fair Value, Measurements, Recurring | Estimated Fair Value | RPAs
Derivative
Derivative assets	3	3
Derivative liabilities	(2)	(3)
Fair Value, Measurements, Recurring | Estimated Fair Value | Interest rate swaps on certificates of deposit
Derivative
Derivative liabilities	(6,793)	(5,976)
Fair Value, Measurements, Recurring | Estimated Fair Value | Foreign currency forward contracts
Derivative
Derivative assets		4,325
Fair Value, Measurements, Recurring | Estimated Fair Value | U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	700,860	720,479
Fair Value, Measurements, Recurring | Estimated Fair Value | U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	180,863	274,866
Fair Value, Measurements, Recurring | Estimated Fair Value | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	264,522	266,799
Fair Value, Measurements, Recurring | Estimated Fair Value | U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Investment securities available-for-sale
Available-for-sale investment securities	1,179,755	1,258,747
Fair Value, Measurements, Recurring | Estimated Fair Value | Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	147,069	147,654
Fair Value, Measurements, Recurring | Estimated Fair Value | Non-agency residential mortgage-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	10,730	11,477
Fair Value, Measurements, Recurring | Estimated Fair Value | Corporate debt securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	2,254	222,377
Fair Value, Measurements, Recurring | Estimated Fair Value | Corporate debt securities | Non-investment grade
Investment securities available-for-sale
Available-for-sale investment securities	9,184	9,173
Fair Value, Measurements, Recurring | Estimated Fair Value | Foreign bonds | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	425,868	383,894
Fair Value, Measurements, Recurring | Estimated Fair Value | Other securities
Investment securities available-for-sale
Available-for-sale investment securities	$ 40,929	$ 40,329

Fair Value Measurement and Fa41

Fair Value Measurement and Fair Value of Financial Instruments (Details 2) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-sale		$ 22,703
Significant Other Observable Inputs (Level 2)
Fair Value, Assets Measured on a Nonrecurring Basis
Loans held-for-sale		22,703
Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	$ 61,003	70,154
Non-PCI impaired loans | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	61,003	70,154
Non-PCI impaired loans | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	10,042	14,908
Non-PCI impaired loans | CRE | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	10,042	14,908
Non-PCI impaired loans | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	47,829	52,172
Non-PCI impaired loans | C&I | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	47,829	52,172
Non-PCI impaired loans | Residential
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	2,522	2,464
Non-PCI impaired loans | Residential | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	2,522	2,464
Non-PCI impaired loans | Consumer
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	610	610
Non-PCI impaired loans | Consumer | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
Impaired loans	610	610
OREO
Fair Value, Assets Measured on a Nonrecurring Basis
OREO	70	345
OREO | Significant Unobservable Inputs (Level 3)
Fair Value, Assets Measured on a Nonrecurring Basis
OREO	$ 70	$ 345

Fair Value Measurement and Fa42

Fair Value Measurement and Fair Value of Financial Instruments (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Loans held-for-sale
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	$ 69	$ 2,400
Fair Value, Measurements, Nonrecurring | OREO
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	(285)	(461)
Fair Value, Measurements, Nonrecurring | Loans held-for-sale
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	0	(2,351)
Fair Value, Measurements, Nonrecurring | Loans Receivable | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	49	163
Fair Value, Measurements, Nonrecurring | Loans Receivable | Non-PCI impaired loans | CRE
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	(64)	2,178
Fair Value, Measurements, Nonrecurring | Loans Receivable | Non-PCI impaired loans | C&I
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	32	(1,935)
Fair Value, Measurements, Nonrecurring | Loans Receivable | Non-PCI impaired loans | Residential
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	82	(83)
Fair Value, Measurements, Nonrecurring | Loans Receivable | Non-PCI impaired loans | Consumer
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	$ (1)	$ 3

Fair Value Measurement and Fa43

Fair Value Measurement and Fair Value of Financial Instruments (Details 4) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Non-PCI impaired loans
Quantitative information
Impaired loans	$ 61,003	$ 70,154
OREO
Quantitative information
OREO	70	345
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans
Quantitative information
Impaired loans	61,003	70,154
Significant Unobservable Inputs (Level 3) | OREO
Quantitative information
OREO	70	345
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI impaired loans | Discounted cash flow
Quantitative information
Impaired loans	$ 31,453	$ 31,835
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI impaired loans | Discounted cash flow | Minimum
Quantitative information
Discount rate (as a percent)	0.00%	0.00%
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI impaired loans | Discounted cash flow | Maximum
Quantitative information
Discount rate (as a percent)	74.00%	62.00%
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI impaired loans | Discounted cash flow | Weighted Average
Quantitative information
Discount rate (as a percent)	11.00%	7.00%
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI impaired loans | Market comparables
Quantitative information
Impaired loans	$ 29,550	$ 38,319
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI impaired loans | Market comparables | Minimum
Quantitative information
Discount rate (as a percent)	0.00%	0.00%
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI impaired loans | Market comparables | Maximum
Quantitative information
Discount rate (as a percent)	100.00%	100.00%
Significant Unobservable Inputs (Level 3) | Loans Receivable | Non-PCI impaired loans | Market comparables | Weighted Average
Quantitative information
Discount rate (as a percent)	7.00%	18.00%
Significant Unobservable Inputs (Level 3) | Loans Receivable | OREO | Appraisal
Quantitative information
OREO	$ 70	$ 345
Selling cost (as a percent)	8.00%	8.00%
Significant Unobservable Inputs (Level 3) | Loans Receivable | OREO | Appraisal | Weighted Average
Quantitative information
Selling cost (as a percent)	8.00%	8.00%

Fair Value Measurement and Fa44

Fair Value Measurement and Fair Value of Financial Instruments (Details 5) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Financial assets:
Cash and cash equivalents	$ 2,434,643	$ 1,878,503	$ 2,265,297	$ 1,360,887
Interest-bearing deposits with banks	249,849	323,148
Resale agreements	1,650,000	2,000,000
Held-to-maturity investment security	132,497	143,971
Loans held-for-sale	28,931	23,076
Loans held-for-investment, net	26,198,198	25,242,619
Restricted equity securities	73,019	72,775
Customer deposits:
Short-term borrowings	42,023	60,050
FHLB advances	322,196	321,643
Repurchase agreements	200,000	350,000
Long-term debt	181,388	186,327
Carrying amount of repurchase agreements eligible for netting against resale agreements	250,000	100,000
Gross repurchase agreements	450,000	450,000
Carrying Amount
Financial assets:
Cash and cash equivalents	2,434,643	1,878,503
Interest-bearing deposits with banks	249,849	323,148
Resale agreements	1,650,000	2,000,000
Held-to-maturity investment security	132,497	143,971
Loans held-for-sale	28,931	23,076
Loans held-for-investment, net	26,198,198	25,242,619
Restricted equity securities	73,019	72,775
Accrued interest receivable	102,067	100,524
Customer deposits:
Demand, interest checking, savings and money market deposits	24,700,811	24,275,714
Time deposits	5,842,164	5,615,269
Short-term borrowings	42,023	60,050
FHLB advances	322,196	321,643
Repurchase agreements	200,000	350,000
Long-term debt	181,388	186,327
Accrued interest payable	9,626	9,440
Estimated Fair Value
Financial assets:
Cash and cash equivalents	2,434,643	1,878,503
Interest-bearing deposits with banks	249,849	323,148
Resale agreements	1,628,839	1,980,457
Held-to-maturity investment security	133,656	144,593
Loans held-for-sale	28,931	23,076
Loans held-for-investment, net	25,825,039	24,915,143
Restricted equity securities	73,019	72,775
Accrued interest receivable	102,067	100,524
Customer deposits:
Demand, interest checking, savings and money market deposits	24,700,811	24,275,714
Time deposits	5,837,924	5,611,746
Short-term borrowings	42,023	60,050
FHLB advances	336,619	334,859
Repurchase agreements	260,545	411,368
Long-term debt	182,502	186,670
Accrued interest payable	9,626	9,440
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	2,434,643	1,878,503
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Financial assets:
Interest-bearing deposits with banks	249,849	323,148
Resale agreements	1,628,839	1,980,457
Loans held-for-sale	28,931	23,076
Restricted equity securities	73,019	72,775
Accrued interest receivable	102,067	100,524
Customer deposits:
Demand, interest checking, savings and money market deposits	24,700,811	24,275,714
Time deposits	5,837,924	5,611,746
Short-term borrowings	42,023	60,050
FHLB advances	336,619	334,859
Repurchase agreements	260,545	411,368
Long-term debt	182,502	186,670
Accrued interest payable	9,626	9,440
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Financial assets:
Held-to-maturity investment security	133,656	144,593
Loans held-for-investment, net	$ 25,825,039	$ 24,915,143

Fair Value Measurement and Fa45

Fair Value Measurement and Fair Value of Financial Instruments (Details 6)	3 Months Ended
	Mar. 31, 2017
Loans Receivable | Non-PCI impaired loans
Fair Values of Financial Assets
Period for updated appraisals and evaluations of impaired loans	12 months

Securities Purchased under Re46

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Resale agreements
Gross resale agreements	$ 1,900,000	$ 2,100,000
Weighted average interest rates (as a percent)	2.15%	1.84%
Repurchase agreements
Gross repurchase agreements	$ 450,000	$ 450,000
Weighted average interest rates (as a percent)	3.30%	3.15%

Securities Purchased under Re47

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Details 2) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets, Resale Agreements
Gross Amounts of Recognized Assets	$ 1,900,000	$ 2,100,000
Gross Amounts Offset on the Consolidated Balance Sheets	(250,000)	(100,000)
Net Amounts of Assets Presented on the Consolidated Balance Sheets	1,650,000	2,000,000
Gross Amounts Not Offset on the Consolidated Balance Sheets
Financial Instruments	(150,000)	(150,000)
Collateral Pledged	(1,488,939)	(1,839,120)
Net Amount	11,061	10,880
Liabilities, Repurchase Agreements
Gross Amounts of Recognized Liabilities	450,000	450,000
Gross Amounts Offset on the Consolidated Balance Sheets	(250,000)	(100,000)
Net Amounts of Liabilities Presented on the Consolidated Balance Sheets	200,000	350,000
Gross Amounts Not Offset on the Consolidated Balance Sheets
Financial Instruments	(150,000)	(150,000)
Collateral Posted	(50,000)	(200,000)
Net Amount	$ 0	$ 0

Securities (Details)

Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Available-for-sale Securities
Amortized Cost	$ 3,005,433	$ 3,385,441
Gross Unrealized Gains	7,147	6,695
Gross Unrealized Losses	(50,546)	(56,341)
Fair Value	2,962,034	3,335,795
Schedule of Held-to-maturity Security
Amortized Cost	132,497	143,971
Fair Value	133,656	144,593
Investment Securities
Amortized Cost	3,137,930	3,529,412
Gross Unrealized Gains	8,306	7,317
Gross Unrealized Losses	(50,546)	(56,341)
Fair Value	3,095,690	3,480,388
U.S. Treasury securities
Schedule of Available-for-sale Securities
Amortized Cost	709,332	730,287
Gross Unrealized Gains	10	21
Gross Unrealized Losses	(8,482)	(9,829)
Fair Value	700,860	720,479
U.S. government agency and U.S. government sponsored enterprise debt securities
Schedule of Available-for-sale Securities
Amortized Cost	183,605	277,891
Gross Unrealized Gains	134	224
Gross Unrealized Losses	(2,876)	(3,249)
Fair Value	180,863	274,866
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	271,025	272,672
Gross Unrealized Gains	337	345
Gross Unrealized Losses	(6,840)	(6,218)
Fair Value	264,522	266,799
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Schedule of Available-for-sale Securities
Amortized Cost	1,185,382	1,266,372
Gross Unrealized Gains	3,855	3,924
Gross Unrealized Losses	(9,482)	(11,549)
Fair Value	1,179,755	1,258,747
Municipal securities
Schedule of Available-for-sale Securities
Amortized Cost	146,559	148,302
Gross Unrealized Gains	1,909	1,252
Gross Unrealized Losses	(1,399)	(1,900)
Fair Value	147,069	147,654
Non-agency residential mortgage-backed securities | Investment grade
Schedule of Available-for-sale Securities
Amortized Cost	10,837	11,592
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(107)	(115)
Fair Value	10,730	11,477
Corporate debt securities | Investment grade
Schedule of Available-for-sale Securities
Amortized Cost	2,476	222,190
Gross Unrealized Gains	0	562
Gross Unrealized Losses	(222)	(375)
Fair Value	2,254	222,377
Corporate debt securities | Non-investment grade
Schedule of Available-for-sale Securities
Amortized Cost	10,191	10,191
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(1,007)	(1,018)
Fair Value	9,184	9,173
Foreign bonds | Investment grade
Schedule of Available-for-sale Securities
Amortized Cost	445,433	405,443
Gross Unrealized Gains	49	30
Gross Unrealized Losses	(19,614)	(21,579)
Fair Value	425,868	383,894
Foreign bonds | Investment grade | Multilateral development bank
Schedule of Available-for-sale Securities
Fair Value	395,500	353,600
Other securities
Schedule of Available-for-sale Securities
Amortized Cost	40,593	40,501
Gross Unrealized Gains	853	337
Gross Unrealized Losses	(517)	(509)
Fair Value	40,929	40,329
Non-agency commercial mortgage-backed security
Schedule of Held-to-maturity Security
Amortized Cost	132,497	143,971
Gross Unrealized Gains	1,159	622
Gross Unrealized Losses	0	0
Fair Value	$ 133,656	$ 144,593

Securities (Details 2)

Securities (Details 2)	3 Months Ended
	Mar. 31, 2017USD ($)security	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)security
Fair Value
Less Than 12 Months	$ 2,114,479,000		$ 2,162,896,000
12 Months or More	195,679,000		253,038,000
Total	2,310,158,000		2,415,934,000
Gross Unrealized Losses
Less Than 12 Months	(46,427,000)		(51,760,000)
12 Months or More	(4,119,000)		(4,581,000)
Total	(50,546,000)		$ (56,341,000)
Impairment loss	$ 0	$ 0
Number of securities in an unrealized loss position | security	163		170
Fair Value
Less Than 12 Months	$ 2,114,479,000		$ 2,162,896,000
12 Months or More	195,679,000		253,038,000
Total	2,310,158,000		2,415,934,000
Gross Unrealized Losses
Less Than 12 Months	(46,427,000)		(51,760,000)
12 Months or More	(4,119,000)		(4,581,000)
Total	(50,546,000)		(56,341,000)
U.S. Treasury securities
Fair Value
Less Than 12 Months	680,801,000		670,268,000
12 Months or More	0		0
Total	680,801,000		670,268,000
Gross Unrealized Losses
Less Than 12 Months	(8,482,000)		(9,829,000)
12 Months or More	0		0
Total	$ (8,482,000)		$ (9,829,000)
Number of securities in an unrealized loss position | security	27		26
U.S. government agency and U.S. government sponsored enterprise debt securities
Fair Value
Less Than 12 Months	$ 154,847,000		$ 203,901,000
12 Months or More	0		0
Total	154,847,000		203,901,000
Gross Unrealized Losses
Less Than 12 Months	(2,876,000)		(3,249,000)
12 Months or More	0		0
Total	$ (2,876,000)		$ (3,249,000)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities
Gross Unrealized Losses
Number of securities in an unrealized loss position | security	83		82
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Fair Value
Less Than 12 Months	$ 212,706,000		$ 202,106,000
12 Months or More	35,193,000		29,201,000
Total	247,899,000		231,307,000
Gross Unrealized Losses
Less Than 12 Months	(5,879,000)		(5,452,000)
12 Months or More	(961,000)		(766,000)
Total	(6,840,000)		(6,218,000)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Fair Value
Less Than 12 Months	598,526,000		629,324,000
12 Months or More	132,328,000		119,603,000
Total	730,854,000		748,927,000
Gross Unrealized Losses
Less Than 12 Months	(8,151,000)		(9,594,000)
12 Months or More	(1,331,000)		(1,955,000)
Total	(9,482,000)		(11,549,000)
Municipal securities
Fair Value
Less Than 12 Months	45,327,000		57,655,000
12 Months or More	6,925,000		2,692,000
Total	52,252,000		60,347,000
Gross Unrealized Losses
Less Than 12 Months	(1,006,000)		(1,699,000)
12 Months or More	(393,000)		(201,000)
Total	(1,399,000)		(1,900,000)
Non-agency residential mortgage-backed securities | Investment grade
Fair Value
Less Than 12 Months	10,729,000		5,033,000
12 Months or More	0		6,444,000
Total	10,729,000		11,477,000
Gross Unrealized Losses
Less Than 12 Months	(107,000)		(101,000)
12 Months or More	0		(14,000)
Total	(107,000)		(115,000)
Corporate debt securities | Investment grade
Fair Value
Less Than 12 Months	0		0
12 Months or More	2,254,000		71,667,000
Total	2,254,000		71,667,000
Gross Unrealized Losses
Less Than 12 Months	0		0
12 Months or More	(222,000)		(375,000)
Total	(222,000)		(375,000)
Corporate debt securities | Non-investment grade
Fair Value
Less Than 12 Months	0		0
12 Months or More	9,184,000		9,173,000
Total	9,184,000		9,173,000
Gross Unrealized Losses
Less Than 12 Months	0		0
12 Months or More	(1,007,000)		(1,018,000)
Total	(1,007,000)		(1,018,000)
Foreign bonds | Investment grade
Fair Value
Less Than 12 Months	380,530,000		363,618,000
12 Months or More	9,795,000		14,258,000
Total	390,325,000		377,876,000
Gross Unrealized Losses
Less Than 12 Months	(19,409,000)		(21,327,000)
12 Months or More	(205,000)		(252,000)
Total	$ (19,614,000)		$ (21,579,000)
Number of securities in an unrealized loss position | security	13		13
Other securities
Fair Value
Less Than 12 Months	$ 31,013,000		$ 30,991,000
12 Months or More	0		0
Total	31,013,000		30,991,000
Gross Unrealized Losses
Less Than 12 Months	(517,000)		(509,000)
12 Months or More	0		0
Total	(517,000)		(509,000)
Non-agency commercial mortgage-backed security
Fair Value
Less Than 12 Months	0		0
12 Months or More	0		0
Total	0		0
Gross Unrealized Losses
Less Than 12 Months	0		0
12 Months or More	0		0
Total	$ 0		$ 0

Securities (Details 3)

Securities (Details 3) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Investment securities available-for-sale
Other Than Temporary Impairment Credit Losses Recognized in Earnings
OTTI credit losses	$ 0	$ 0

Securities (Details 4)

Securities (Details 4) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 302,656	$ 652,753
Gross realized gains	2,474	3,967
Gross realized losses	0	125
Related tax expense	$ 1,040	$ 1,616

Securities (Details 5)

Securities (Details 5) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Amortized Cost
Due within one year	$ 519,223
Due after one year through five years	878,436
Due after five years through ten years	241,665
Due after ten years	1,366,109
Total available-for-sale investment securities	3,005,433
Estimated Fair Value
Due within one year	503,271
Due after one year through five years	867,870
Due after five years through ten years	236,183
Due after ten years	1,354,710
Total available-for-sale investment securities	2,962,034	$ 3,335,795
Amortized Cost
Due after ten years	132,497
Estimated Fair Value
Due after ten years	133,656
Fair values of available-for-sale investment securities pledged	$ 640,900	$ 767,400

Securities (Details 6)

Securities (Details 6) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Investments, Debt and Equity Securities [Abstract]
Federal Reserve Bank stock	$ 17,250	$ 17,250
FHLB stock	55,769	55,525
Total	$ 73,019	$ 72,775

Derivatives (Details)

Derivatives (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Fair Values of Derivative Instruments
Derivative Assets	$ 69,809	$ 83,780
Derivative Liabilities	74,356	82,323
Derivatives designated as hedging instruments
Fair Values of Derivative Instruments
Notional Amount	48,365	131,391
Derivative Assets	0	4,325
Derivative Liabilities	6,793	5,976
Derivatives designated as hedging instruments | Interest rate swaps on certificates of deposit
Fair Values of Derivative Instruments
Notional Amount	48,365	48,365
Derivative Assets	0	0
Derivative Liabilities	6,793	5,976
Derivatives designated as hedging instruments | Foreign currency forward contracts
Fair Values of Derivative Instruments
Notional Amount	0	83,026
Derivative Assets	0	4,325
Derivative Liabilities	0	0
Derivatives not designated as hedging instruments
Fair Values of Derivative Instruments
Notional Amount	9,170,134	8,507,660
Derivative Assets	69,809	79,455
Derivative Liabilities	67,563	76,347
Derivatives not designated as hedging instruments | Interest rate swaps and options
Fair Values of Derivative Instruments
Notional Amount	7,831,456	7,668,482
Derivative Assets	61,586	67,578
Derivative Liabilities	60,204	65,131
Derivatives not designated as hedging instruments | Foreign exchange contracts
Fair Values of Derivative Instruments
Notional Amount	1,267,282	767,764
Derivative Assets	8,220	11,874
Derivative Liabilities	7,357	11,213
Derivatives not designated as hedging instruments | RPAs
Fair Values of Derivative Instruments
Notional Amount	71,396	71,414
Derivative Assets	3	3
Derivative Liabilities	$ 2	$ 3

Derivatives (Details 2)

Derivatives (Details 2) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Derivative [Line Items]
Derivative liabilities	$ 74,356	$ 82,323
Derivative assets	69,809	83,780
Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	48,365	131,391
Derivative liabilities	6,793	5,976
Derivative assets	0	4,325
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	9,170,134	8,507,660
Derivative liabilities	67,563	76,347
Derivative assets	69,809	79,455
Interest rate swaps on certificates of deposit | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	48,365	48,365
Derivative liabilities	6,793	5,976
Derivative assets	0	0
Foreign currency forward contracts | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	0	83,026
Derivative liabilities	0	0
Derivative assets	0	4,325
Interest rate swaps and options | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	7,831,456	7,668,482
Derivative liabilities	60,204	65,131
Derivative assets	61,586	67,578
Notional amount of derivative assets	3,920,000	3,860,000
Notional amount of derivative liabilities	3,910,000	3,810,000
Foreign exchange contracts | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	1,270,000	767,800
Derivative liabilities	7,400	11,200
Derivative assets	8,200	11,900
RPAs | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	71,396	71,414
Derivative liabilities	2	3
Derivative assets	3	3
Interest rate derivative exposure	$ 112	$ 179
Weighted average remaining maturity (in years)	3 years 6 months	3 years 8 months
RPAs | Derivatives not designated as hedging instruments | Long
Derivative [Line Items]
Notional amount	$ 49,100	$ 48,300
RPAs | Derivatives not designated as hedging instruments | Short
Derivative [Line Items]
Notional amount	$ 22,300	$ 23,100

Derivatives (Details 3)

Derivatives (Details 3) - Interest Expense - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Certificates of deposits
Derivative [Line Items]
Recognized on certificates of deposit	$ 688	$ (3,356)
Interest rate swaps on certificates of deposit
Derivative [Line Items]
Recognized on interest rate swaps	$ (817)	$ 4,229

Derivatives (Details 4)

Derivatives (Details 4) - Derivatives designated as hedging instruments - Net investment hedges - Foreign currency forward contracts - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Losses recognized in AOCI on net investment hedges (effective portion)	$ 648	$ 1,485
Losses recognized in foreign exchange income (ineffective portion)	$ 1,953	$ 880

Derivatives (Details 5)

Derivatives (Details 5) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for not designated as hedging instruments	$ 4,773	$ 2,106
Interest rate swaps and options | Derivative fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for not designated as hedging instruments	(1,066)	(711)
Foreign exchange contracts | Foreign exchange income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for not designated as hedging instruments	5,838	2,828
RPAs | Derivative fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for not designated as hedging instruments	$ 1	$ (11)

Derivatives (Details 6)

Derivatives (Details 6) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Derivatives Assets
Gross Amounts including Contracts Not Subject to Master Netting Arrangement	$ 69,809	$ 83,780
Contracts Not Subject to Master Netting Arrangements	44,570	51,218
Gross Amounts	25,239	32,562
Gross Amounts Offset on the Consolidated Balance Sheets	0	0
Net Amounts Presented on the Consolidated Balance Sheets	25,239	32,562
Gross Amounts Not Offset on the Consolidated Balance Sheets
Derivative Amount	(20,964)	(20,991)
Collateral Received	(4,162)	(10,687)
Net Amount	113	884
Cash collateral received	1,000	8,100
Derivatives Liabilities
Gross Amounts including Contracts Not Subject to Master Netting Arrangement	74,356	82,323
Contracts Not Subject to Master Netting Arrangements	22,699	24,097
Gross Amounts	51,657	58,226
Gross Amounts Offset on the Consolidated Balance Sheets	0	0
Net Amounts Presented on the Consolidated Balance Sheets	51,657	58,226
Gross Amounts Not Offset on the Consolidated Balance Sheets
Derivative Amount	(20,964)	(20,991)
Collateral Posted	(29,833)	(36,349)
Net Amount	860	886
Cash collateral posted	$ 1,200	$ 170

Loans Receivable and Allowanc60

Loans Receivable and Allowance for Credit Losses (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment, net	$ 26,198,198	$ 25,242,619
Loans Receivable
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	26,461,292	25,503,139
Allowance for loan losses	(263,094)	(260,520)
Loans held-for-investment, net	26,198,198	25,242,619
Loans Receivable | CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	8,986,890	8,690,863
Loans Receivable | CRE | Income producing
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	8,302,098	8,016,109
Loans Receivable | CRE | Construction
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	562,560	551,560
Loans Receivable | CRE | Land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	122,232	123,194
Loans Receivable | C&I
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	9,918,072	9,640,563
Loans Receivable | C&I | Commercial business
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	9,208,857	8,959,633
Loans Receivable | C&I | Trade finance
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	709,215	680,930
Loans Receivable | Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	5,432,767	5,095,718
Loans Receivable | Residential | Real estate loan | Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	3,700,072	3,509,779
Loans Receivable | Residential | Real estate loan | Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	1,732,695	1,585,939
Loans Receivable | Consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	2,123,563	2,075,995
Loans Receivable | Non-PCI Loans
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	25,849,628	24,860,694
Allowance for loan losses	(263,007)	(260,402)
Loans held-for-investment, net	25,586,621	24,600,292
Deferred loan fees, unamortized premiums and unaccreted discounts	(4,700)	1,200
Loans Receivable | Non-PCI Loans | CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	8,647,669	8,340,497
Loans Receivable | Non-PCI Loans | CRE | Income producing
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	7,964,224	7,667,661
Loans Receivable | Non-PCI Loans | CRE | Construction
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	562,560	551,560
Loans Receivable | Non-PCI Loans | CRE | Land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	120,885	121,276
Loans Receivable | Non-PCI Loans | C&I
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	9,885,962	9,602,176
Loans Receivable | Non-PCI Loans | C&I | Commercial business
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	9,176,747	8,921,246
Loans Receivable | Non-PCI Loans | C&I | Trade finance
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	709,215	680,930
Loans Receivable | Non-PCI Loans | Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	5,209,906	4,860,954
Loans Receivable | Non-PCI Loans | Residential | Real estate loan | Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	3,566,739	3,370,669
Loans Receivable | Non-PCI Loans | Residential | Real estate loan | Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	1,643,167	1,490,285
Loans Receivable | Non-PCI Loans | Consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	2,106,091	2,057,067
Loans Receivable | PCI Loans
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	611,664	642,445
Allowance for loan losses	(87)	(118)
Loans held-for-investment, net	611,577	642,327
Loans Receivable | PCI Loans | CRE
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	339,221	350,366
Loans Receivable | PCI Loans | CRE | Income producing
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	337,874	348,448
Loans Receivable | PCI Loans | CRE | Construction
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	0	0
Loans Receivable | PCI Loans | CRE | Land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	1,347	1,918
Loans Receivable | PCI Loans | C&I
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	32,110	38,387
Loans Receivable | PCI Loans | C&I | Commercial business
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	32,110	38,387
Loans Receivable | PCI Loans | C&I | Trade finance
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	0	0
Loans Receivable | PCI Loans | Residential
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	222,861	234,764
Loans Receivable | PCI Loans | Residential | Real estate loan | Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	133,333	139,110
Loans Receivable | PCI Loans | Residential | Real estate loan | Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	89,528	95,654
Loans Receivable | PCI Loans | Consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Total loans held-for-investment	$ 17,472	$ 18,928

Loans Receivable and Allowanc61

Loans Receivable and Allowance for Credit Losses (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loan-to-value ratio (or less at origination)	60.00%
Loans receivable pledged to secure borrowings and to provide additional borrowing capacity from the FHLB and the Federal Reserve Bank	$ 17,159,894	$ 16,441,068
Loans Receivable
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans receivable pledged to secure borrowings and to provide additional borrowing capacity from the FHLB and the Federal Reserve Bank	$ 17,160,000	$ 16,440,000
Loans Receivable | Residential | Real estate loan
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Adjustable rate mortgage, term of initial fixed interest rates, option one	1 year
Adjustable rate mortgage, term of initial fixed interest rates, option two	5 years

Loans Receivable and Allowanc62

Loans Receivable and Allowance for Credit Losses (Details 3) - Loans Receivable - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	$ 26,461,292	$ 25,503,139
CRE
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	8,986,890	8,690,863
CRE | Income producing
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	8,302,098	8,016,109
CRE | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	562,560	551,560
CRE | Land
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	122,232	123,194
C&I
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	9,918,072	9,640,563
C&I | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	9,208,857	8,959,633
C&I | Trade finance
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	709,215	680,930
Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	5,432,767	5,095,718
Residential | Real estate loan | Single-family
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,700,072	3,509,779
Residential | Real estate loan | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,732,695	1,585,939
Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	2,123,563	2,075,995
Non-PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	25,849,628	24,860,694
Non-PCI Loans | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	25,184,475	24,177,983
Non-PCI Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	215,345	212,927
Non-PCI Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	424,879	464,609
Non-PCI Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	24,929	5,167
Non-PCI Loans | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	8
Non-PCI Loans | CRE
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	8,647,669	8,340,497
Non-PCI Loans | CRE | Income producing
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	7,964,224	7,667,661
Non-PCI Loans | CRE | Income producing | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	7,800,487	7,476,804
Non-PCI Loans | CRE | Income producing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	23,362	29,005
Non-PCI Loans | CRE | Income producing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	140,375	161,852
Non-PCI Loans | CRE | Income producing | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Income producing | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	562,560	551,560
Non-PCI Loans | CRE | Construction | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	530,278	551,560
Non-PCI Loans | CRE | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	32,282	0
Non-PCI Loans | CRE | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Construction | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Land
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	120,885	121,276
Non-PCI Loans | CRE | Land | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	109,013	107,976
Non-PCI Loans | CRE | Land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | CRE | Land | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	11,872	13,290
Non-PCI Loans | CRE | Land | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	10
Non-PCI Loans | CRE | Land | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | C&I
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	9,885,962	9,602,176
Non-PCI Loans | C&I | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	9,176,747	8,921,246
Non-PCI Loans | C&I | Commercial business | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	8,827,318	8,559,674
Non-PCI Loans | C&I | Commercial business | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	139,251	155,276
Non-PCI Loans | C&I | Commercial business | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	185,249	201,139
Non-PCI Loans | C&I | Commercial business | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	24,929	5,157
Non-PCI Loans | C&I | Commercial business | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | C&I | Trade finance
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	709,215	680,930
Non-PCI Loans | C&I | Trade finance | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	677,654	635,027
Non-PCI Loans | C&I | Trade finance | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,566	9,435
Non-PCI Loans | C&I | Trade finance | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	27,995	36,460
Non-PCI Loans | C&I | Trade finance | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | C&I | Trade finance | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	8
Non-PCI Loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	5,209,906	4,860,954
Non-PCI Loans | Residential | Real estate loan | Single-family
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,566,739	3,370,669
Non-PCI Loans | Residential | Real estate loan | Single-family | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,533,047	3,341,015
Non-PCI Loans | Residential | Real estate loan | Single-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	8,693	10,179
Non-PCI Loans | Residential | Real estate loan | Single-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	24,999	19,475
Non-PCI Loans | Residential | Real estate loan | Single-family | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | Residential | Real estate loan | Single-family | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | Residential | Real estate loan | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,643,167	1,490,285
Non-PCI Loans | Residential | Real estate loan | Multifamily | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,619,193	1,462,522
Non-PCI Loans | Residential | Real estate loan | Multifamily | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,284	2,268
Non-PCI Loans | Residential | Real estate loan | Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	22,690	25,495
Non-PCI Loans | Residential | Real estate loan | Multifamily | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | Residential | Real estate loan | Multifamily | Loss
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	2,106,091	2,057,067
Non-PCI Loans | Consumer | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	2,087,485	2,043,405
Non-PCI Loans | Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	6,907	6,764
Non-PCI Loans | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	11,699	6,898
Non-PCI Loans | Consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
Non-PCI Loans | 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	611,664	642,445
PCI Loans | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	537,095	568,844
PCI Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,149	5,566
PCI Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	71,420	68,035
PCI Loans | CRE
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	339,221	350,366
PCI Loans | CRE | Income producing
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	337,874	348,448
PCI Loans | CRE | Income producing | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	282,099	293,529
PCI Loans | CRE | Income producing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	573	3,239
PCI Loans | CRE | Income producing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	55,202	51,680
PCI Loans | CRE | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
PCI Loans | CRE | Land
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,347	1,918
PCI Loans | CRE | Land | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,012	1,562
PCI Loans | CRE | Land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
PCI Loans | CRE | Land | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	335	356
PCI Loans | C&I
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	32,110	38,387
PCI Loans | C&I | Commercial business
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	32,110	38,387
PCI Loans | C&I | Commercial business | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	27,884	33,885
PCI Loans | C&I | Commercial business | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	680	772
PCI Loans | C&I | Commercial business | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	3,546	3,730
PCI Loans | C&I | Trade finance
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
PCI Loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	222,861	234,764
PCI Loans | Residential | Real estate loan | Single-family
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	133,333	139,110
PCI Loans | Residential | Real estate loan | Single-family | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	130,031	136,245
PCI Loans | Residential | Real estate loan | Single-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,522	1,239
PCI Loans | Residential | Real estate loan | Single-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	1,780	1,626
PCI Loans | Residential | Real estate loan | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	89,528	95,654
PCI Loans | Residential | Real estate loan | Multifamily | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	80,510	86,190
PCI Loans | Residential | Real estate loan | Multifamily | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	0	0
PCI Loans | Residential | Real estate loan | Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	9,018	9,464
PCI Loans | Consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	17,472	18,928
PCI Loans | Consumer | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	15,559	17,433
PCI Loans | Consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	374	316
PCI Loans | Consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans held-for-investment	$ 1,539	$ 1,179

Loans Receivable and Allowanc63

Loans Receivable and Allowance for Credit Losses (Details 4) - Loans Receivable - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Nonaccrual and Past Due Loans
Number of days beyond loan classified nonaccrual	90 days
Total loans	$ 26,461,292	$ 25,503,139
CRE
Nonaccrual and Past Due Loans
Total loans	8,986,890	8,690,863
CRE | Income producing
Nonaccrual and Past Due Loans
Total loans	8,302,098	8,016,109
CRE | Construction
Nonaccrual and Past Due Loans
Total loans	562,560	551,560
CRE | Land
Nonaccrual and Past Due Loans
Total loans	122,232	123,194
C&I
Nonaccrual and Past Due Loans
Total loans	9,918,072	9,640,563
C&I | Commercial business
Nonaccrual and Past Due Loans
Total loans	9,208,857	8,959,633
C&I | Trade finance
Nonaccrual and Past Due Loans
Total loans	709,215	680,930
Residential
Nonaccrual and Past Due Loans
Total loans	5,432,767	5,095,718
Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total loans	3,700,072	3,509,779
Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total loans	1,732,695	1,585,939
Consumer
Nonaccrual and Past Due Loans
Total loans	2,123,563	2,075,995
Non-PCI Loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	28,573	101,189
Total Nonaccrual Loans	141,155	122,817
Current Accruing Loans	25,679,900	24,636,688
Total loans	25,849,628	24,860,694
Non-PCI Loans | CRE
Nonaccrual and Past Due Loans
Total loans	8,647,669	8,340,497
Non-PCI Loans | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,132	20,313
Total Nonaccrual Loans	33,716	26,907
Current Accruing Loans	7,927,376	7,620,441
Total loans	7,964,224	7,667,661
Non-PCI Loans | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	4,994
Total Nonaccrual Loans	0	0
Current Accruing Loans	562,560	546,566
Total loans	562,560	551,560
Non-PCI Loans | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	4,500	5,326
Current Accruing Loans	116,385	115,950
Total loans	120,885	121,276
Non-PCI Loans | C&I
Nonaccrual and Past Due Loans
Total loans	9,885,962	9,602,176
Non-PCI Loans | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	8,483	47,331
Total Nonaccrual Loans	92,093	81,248
Current Accruing Loans	9,076,171	8,792,667
Total loans	9,176,747	8,921,246
Non-PCI Loans | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Total Nonaccrual Loans	0	8
Current Accruing Loans	709,215	680,922
Total loans	709,215	680,930
Non-PCI Loans | Residential
Nonaccrual and Past Due Loans
Total loans	5,209,906	4,860,954
Non-PCI Loans | Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7,457	17,671
Total Nonaccrual Loans	5,643	4,214
Current Accruing Loans	3,553,639	3,348,784
Total loans	3,566,739	3,370,669
Non-PCI Loans | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,705	4,325
Total Nonaccrual Loans	2,222	2,984
Current Accruing Loans	1,635,240	1,482,976
Total loans	1,643,167	1,490,285
Non-PCI Loans | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,796	6,555
Total Nonaccrual Loans	2,981	2,130
Current Accruing Loans	2,099,314	2,048,382
Total loans	2,106,091	2,057,067
Non-PCI Loans | Accruing Loans 30-59 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	21,974	73,152
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,132	6,233
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	4,994
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	8,478	45,052
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,211	9,595
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	4,801	3,951
Non-PCI Loans | Accruing Loans 30-59 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	3,352	3,327
Non-PCI Loans | Accruing Loans 60-89 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	6,599	28,037
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	14,080
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | CRE | Construction
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | CRE | Land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5	2,279
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,246	8,076
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	904	374
Non-PCI Loans | Accruing Loans 60-89 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	444	3,228
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	60,067	78,779
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	11,596	14,872
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | CRE | Construction
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	0
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | CRE | Land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	47	433
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	47,238	60,511
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	8
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	0
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	1,030	2,790
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	156	165
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	81,088	44,038
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | CRE | Income producing
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	22,120	12,035
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | CRE | Construction
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	0
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | CRE | Land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	4,453	4,893
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | C&I | Commercial business
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	44,855	20,737
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | C&I | Trade finance
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	0
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | Residential | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	5,643	4,214
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | Residential | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	1,192	194
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due | Consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	$ 2,825	$ 1,965

Loans Receivable and Allowanc64

Loans Receivable and Allowance for Credit Losses (Details 5) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Loans in process of foreclosure
Other real estate owned, net	$ 3,600,000	$ 6,700,000
Residential real estate properties
Loans in process of foreclosure
Carrying amount of foreclosed residential real estate properties included in total net OREO	0	401,000
Residential
Loans in process of foreclosure
Recorded investment in residential and consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process	944,000	3,100,000
Loans Receivable | Acquired with deteriorated credit quality
Nonaccrual loans
Total Nonaccrual Loans	$ 12,000,000	$ 11,700,000

Loans Receivable and Allowanc65

Loans Receivable and Allowance for Credit Losses (Details 6) - Loans Receivable - Non-PCI Loans $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)loan	Mar. 31, 2016USD ($)loan
Loans Modified as TDRs
Post-Modification Outstanding Recorded Investment	$ 6,419	$ 41,034
CRE
Loans Modified as TDRs
Post-Modification Outstanding Recorded Investment	$ 1,505	$ 13,758
CRE | Income producing
Loans Modified as TDRs
Number of Loans | loan	1	2
Pre-Modification Outstanding Recorded Investment	$ 1,526	$ 13,775
Post-Modification Outstanding Recorded Investment	1,505	13,758
Financial Impact	$ 0	$ 0
CRE | Land
Loans Modified as TDRs
Number of Loans | loan	2	0
Pre-Modification Outstanding Recorded Investment	$ 86	$ 0
Post-Modification Outstanding Recorded Investment	0	0
Financial Impact	0	0
C&I
Loans Modified as TDRs
Post-Modification Outstanding Recorded Investment	$ 4,914	$ 26,659
C&I | Commercial business
Loans Modified as TDRs
Number of Loans | loan	2	4
Pre-Modification Outstanding Recorded Investment	$ 6,448	$ 21,614
Post-Modification Outstanding Recorded Investment	4,914	18,577
Financial Impact	$ 1,273	$ 97
C&I | Trade finance
Loans Modified as TDRs
Number of Loans | loan	0	2
Pre-Modification Outstanding Recorded Investment	$ 0	$ 7,901
Post-Modification Outstanding Recorded Investment	0	8,082
Financial Impact	0	0
Residential
Loans Modified as TDRs
Post-Modification Outstanding Recorded Investment	$ 0	$ 272
Residential | Real estate loan | Single-family
Loans Modified as TDRs
Number of Loans | loan	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 276
Post-Modification Outstanding Recorded Investment	0	272
Financial Impact	$ 0	$ 0
Consumer
Loans Modified as TDRs
Number of Loans | loan	0	1
Pre-Modification Outstanding Recorded Investment	$ 0	$ 344
Post-Modification Outstanding Recorded Investment	0	345
Financial Impact	$ 0	$ 1

Loans Receivable and Allowanc66

Loans Receivable and Allowance for Credit Losses (Details 7) - Loans Receivable - Non-PCI Loans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	$ 6,419	$ 41,034
Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	1,505	33,459
Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	4,914	0
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	3,615
Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	3,960
CRE
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	1,505	13,758
CRE | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	1,505	13,730
CRE | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
CRE | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
CRE | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	28
C&I
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	4,914	26,659
C&I | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	19,112
C&I | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	4,914	0
C&I | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	3,615
C&I | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	3,932
Residential
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	272
Residential | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	272
Residential | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
Residential | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
Residential | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	345
Consumer | Principal
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	345
Consumer | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	0	0
Consumer | Other
Financing Receivable, Modifications [Line Items]
Post-modification outstanding recorded investment	$ 0	$ 0

Loans Receivable and Allowanc67

Loans Receivable and Allowance for Credit Losses (Details 8) $ in Thousands	3 Months Ended
	Mar. 31, 2017USD ($)loan	Mar. 31, 2016USD ($)loan	Dec. 31, 2016USD ($)
Financing Receivable, Modifications [Line Items]
Additional funds committed to lend to borrowers whose terms have been modified	$ 4,000		$ 9,900
Loans Receivable
Financing Receivable, Modifications [Line Items]
Period beyond which a TDR generally becomes delinquent	90 days
Loans Receivable | Non-PCI Loans | C&I | Commercial business
Financing Receivable, Modifications [Line Items]
Number of loans modified as TDRs that subsequently defaulted | loan	1	4
Recorded Investment	$ 2,718	$ 966

Loans Receivable and Allowanc68

Loans Receivable and Allowance for Credit Losses (Details 9) - Loans Receivable - Non-PCI Loans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Impaired loans disclosures
Unpaid Principal Balance	$ 271,457		$ 255,273
Recorded Investment With No Allowance	153,021		121,934
Recorded Investment With Allowance	64,208		84,121
Total Recorded Investment	217,229		206,055
Related Allowance	8,147		12,701
Average Recorded Investment	221,601	$ 229,300
Recognized Interest Income	328	993
CRE | Income producing
Impaired loans disclosures
Unpaid Principal Balance	48,832		50,718
Recorded Investment With No Allowance	34,984		32,507
Recorded Investment With Allowance	9,528		14,001
Total Recorded Investment	44,512		46,508
Related Allowance	1,159		1,263
Average Recorded Investment	44,772	71,767
Recognized Interest Income	35	391
CRE | Land
Impaired loans disclosures
Unpaid Principal Balance	5,050		6,457
Recorded Investment With No Allowance	4,453		5,427
Recorded Investment With Allowance	47		443
Total Recorded Investment	4,500		5,870
Related Allowance	6		63
Average Recorded Investment	4,717	6,952
Recognized Interest Income	0	9
C&I | Commercial business
Impaired loans disclosures
Unpaid Principal Balance	182,965		162,239
Recorded Investment With No Allowance	101,963		78,316
Recorded Investment With Allowance	34,031		42,137
Total Recorded Investment	135,994		120,453
Related Allowance	6,218		10,443
Average Recorded Investment	138,931	94,505
Recognized Interest Income	214	369
C&I | Trade finance
Impaired loans disclosures
Unpaid Principal Balance	3,449		5,227
Recorded Investment With No Allowance	3,438		0
Recorded Investment With Allowance	0		5,166
Total Recorded Investment	3,438		5,166
Related Allowance	0		34
Average Recorded Investment	4,283	13,737
Recognized Interest Income	7	66
Residential | Real estate loan | Single-family
Impaired loans disclosures
Unpaid Principal Balance	16,132		15,435
Recorded Investment With No Allowance	1,864		0
Recorded Investment With Allowance	13,172		14,335
Total Recorded Investment	15,036		14,335
Related Allowance	611		687
Average Recorded Investment	15,096	18,356
Recognized Interest Income	22	65
Residential | Real estate loan | Multifamily
Impaired loans disclosures
Unpaid Principal Balance	10,132		11,181
Recorded Investment With No Allowance	5,649		5,684
Recorded Investment With Allowance	3,575		4,357
Total Recorded Investment	9,224		10,041
Related Allowance	121		180
Average Recorded Investment	9,269	22,345
Recognized Interest Income	38	77
Consumer
Impaired loans disclosures
Unpaid Principal Balance	4,897		4,016
Recorded Investment With No Allowance	670		0
Recorded Investment With Allowance	3,855		3,682
Total Recorded Investment	4,525		3,682
Related Allowance	32		$ 31
Average Recorded Investment	4,533	1,638
Recognized Interest Income	$ 12	$ 16

Loans Receivable and Allowanc69

Loans Receivable and Allowance for Credit Losses (Details 10) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Allowance for loan losses
Beginning balance	$ 260,520
Charge-offs	(92)	$ (1,800)
Ending balance	263,094
CRE
Allowance for loan losses
Beginning balance	72,916
Ending balance	74,974
C&I
Allowance for loan losses
Beginning balance	142,167
Ending balance	137,510
Residential
Allowance for loan losses
Beginning balance	37,338
Ending balance	41,747
Consumer
Allowance for loan losses
Beginning balance	8,099
Ending balance	8,863
PCI Loans
Allowance for loan losses
Beginning balance	118
Ending balance	87
PCI Loans | CRE
Allowance for loan losses
Beginning balance	112
Ending balance	86
PCI Loans | C&I
Allowance for loan losses
Beginning balance	1
Ending balance	0
PCI Loans | Residential
Allowance for loan losses
Beginning balance	5
Ending balance	1
PCI Loans | Consumer
Allowance for loan losses
Beginning balance	0
Ending balance	0
Loans Receivable
Allowance for loan losses
Beginning balance	260,520	264,959
Provision for (reversal of) loan losses	8,015	386
Charge-offs	(7,209)	(6,054)
Recoveries	1,768	947
Net recoveries (charge-offs)	(5,441)	(5,107)
Ending balance	263,094	260,238
Loans Receivable | PCI Loans
Allowance for loan losses
Beginning balance	118	359
Provision for (reversal of) loan losses	(31)	(31)
Charge-offs	0	0
Recoveries	0	0
Net recoveries (charge-offs)	0	0
Ending balance	87	328
Loans Receivable | Non-PCI Loans
Allowance for loan losses
Beginning balance	260,402	264,600
Provision for (reversal of) loan losses	8,046	417
Charge-offs	(7,209)	(6,054)
Recoveries	1,768	947
Net recoveries (charge-offs)	(5,441)	(5,107)
Ending balance	263,007	259,910
Loans Receivable | Non-PCI Loans | CRE
Allowance for loan losses
Beginning balance	72,804	81,191
Provision for (reversal of) loan losses	1,639	1,306
Charge-offs	(148)	(56)
Recoveries	593	97
Net recoveries (charge-offs)	445	41
Ending balance	74,888	82,538
Loans Receivable | Non-PCI Loans | C&I
Allowance for loan losses
Beginning balance	142,166	134,597
Provision for (reversal of) loan losses	1,946	4,654
Charge-offs	(7,057)	(5,860)
Recoveries	455	686
Net recoveries (charge-offs)	(6,602)	(5,174)
Ending balance	137,510	134,077
Loans Receivable | Non-PCI Loans | Residential
Allowance for loan losses
Beginning balance	37,333	39,292
Provision for (reversal of) loan losses	3,835	(5,317)
Charge-offs	0	(137)
Recoveries	578	97
Net recoveries (charge-offs)	578	(40)
Ending balance	41,746	33,935
Loans Receivable | Non-PCI Loans | Consumer
Allowance for loan losses
Beginning balance	8,099	9,520
Provision for (reversal of) loan losses	626	(226)
Charge-offs	(4)	(1)
Recoveries	142	67
Net recoveries (charge-offs)	138	66
Ending balance	$ 8,863	$ 9,360

Loans Receivable and Allowanc70

Loans Receivable and Allowance for Credit Losses (Details 11) - Allowance for Unfunded Credit Reserve - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Allowance for unfunded credit reserves
Beginning balance	$ 16,121	$ 20,360
(Reversal of) provision for unfunded credit reserves	(947)	1,054
Ending balance	$ 15,174	$ 21,414

Loans Receivable and Allowanc71

Loans Receivable and Allowance for Credit Losses (Details 12) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Allowance for loan losses
Individually evaluated for impairment	$ 8,147	$ 12,701
Collectively evaluated for impairment	254,860	247,701
Allowance for loan losses	263,094	260,520
Acquired with deteriorated credit quality
Allowance for loan losses
Allowance for loan losses	87	118
CRE
Allowance for loan losses
Individually evaluated for impairment	1,165	1,326
Collectively evaluated for impairment	73,723	71,478
Allowance for loan losses	74,974	72,916
CRE | Acquired with deteriorated credit quality
Allowance for loan losses
Allowance for loan losses	86	112
C&I
Allowance for loan losses
Individually evaluated for impairment	6,218	10,477
Collectively evaluated for impairment	131,292	131,689
Allowance for loan losses	137,510	142,167
C&I | Acquired with deteriorated credit quality
Allowance for loan losses
Allowance for loan losses	0	1
Residential
Allowance for loan losses
Individually evaluated for impairment	732	867
Collectively evaluated for impairment	41,014	36,466
Allowance for loan losses	41,747	37,338
Residential | Acquired with deteriorated credit quality
Allowance for loan losses
Allowance for loan losses	1	5
Consumer
Allowance for loan losses
Individually evaluated for impairment	32	31
Collectively evaluated for impairment	8,831	8,068
Allowance for loan losses	8,863	8,099
Consumer | Acquired with deteriorated credit quality
Allowance for loan losses
Allowance for loan losses	0	0
Loans Receivable
Allowance for loan losses
Allowance for loan losses	263,094	260,520	$ 260,238	$ 264,959
Recorded investment in loans
Individually evaluated for impairment	217,229	206,055
Collectively evaluated for impairment	25,632,399	24,654,639
Total loans held-for-investment	26,461,292	25,503,139
Loans Receivable | Acquired with deteriorated credit quality
Allowance for loan losses
Allowance for loan losses	87	118	$ 328	$ 359
Recorded investment in loans
Total loans held-for-investment	611,664	642,445
Loans Receivable | CRE
Recorded investment in loans
Individually evaluated for impairment	49,012	52,378
Collectively evaluated for impairment	8,598,657	8,288,119
Total loans held-for-investment	8,986,890	8,690,863
Loans Receivable | CRE | Acquired with deteriorated credit quality
Recorded investment in loans
Total loans held-for-investment	339,221	350,366
Loans Receivable | C&I
Recorded investment in loans
Individually evaluated for impairment	139,432	125,619
Collectively evaluated for impairment	9,746,530	9,476,557
Total loans held-for-investment	9,918,072	9,640,563
Loans Receivable | C&I | Acquired with deteriorated credit quality
Recorded investment in loans
Total loans held-for-investment	32,110	38,387
Loans Receivable | Residential
Recorded investment in loans
Individually evaluated for impairment	24,260	24,376
Collectively evaluated for impairment	5,185,646	4,836,578
Total loans held-for-investment	5,432,767	5,095,718
Loans Receivable | Residential | Acquired with deteriorated credit quality
Recorded investment in loans
Total loans held-for-investment	222,861	234,764
Loans Receivable | Consumer
Recorded investment in loans
Individually evaluated for impairment	4,525	3,682
Collectively evaluated for impairment	2,101,566	2,053,385
Total loans held-for-investment	2,123,563	2,075,995
Loans Receivable | Consumer | Acquired with deteriorated credit quality
Recorded investment in loans
Total loans held-for-investment	$ 17,472	$ 18,928

Loans Receivable and Allowanc72

Loans Receivable and Allowance for Credit Losses (Details 13) - Loans Receivable - PCI Loans - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Changes in accretable yield for PCI loans
Beginning balance	$ 136,247	$ 214,907
Accretion	(10,279)	(22,429)
Changes in expected cash flows	2,022	(6,487)
Ending balance	$ 127,990	$ 185,991

Loans Receivable and Allowanc73

Loans Receivable and Allowance for Credit Losses (Details 14) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Loans Held-for-Sale
Loans held-for-sale	$ 28,931,000		$ 23,076,000
Loans held-for-investment transferred to loans held-for-sale, net	278,024,000	$ 308,722,000
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses	92,000	1,800,000
Held-to-maturity investment security	132,497,000		$ 143,971,000
Loans held-for-sale
Loans Held-for-Sale
Lower of cost or fair value adjustment	69,000	2,400,000
Multifamily
Loans Held-for-Sale
Gain on securitizations		1,100,000
Mortgage servicing rights		641,000
Held-to-maturity investment security		160,100,000
Loans securitized		201,700,000
Loans purchased in secondary market
Loans Held-for-Sale
Loans purchased	147,200,000	239,300,000
Originated | Single-family residential and C&I
Loans Held-for-Sale
Loans sold	29,300,000
Net gains (losses) from sales of loans held-for-sale during the period	1,800,000
Originated | Multifamily residential, C&I, and CRE
Loans Held-for-Sale
Net gains (losses) from sales of loans held-for-sale during the period		4,300,000
Carrying value of loans sold or securitized		256,200,000
Purchased | Loans sold in secondary market
Loans Held-for-Sale
Net gains (losses) from sales of loans held-for-sale during the period	1,000,000	0
Carrying value of loans sold or securitized	$ 246,600,000	$ 53,900,000

Investments in Qualified Affo74

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net [Abstract]
Minimum compliance period for qualified affordable housing partnerships to fully utilize the tax credits (in years)	15 years
Investments in qualified affordable housing partnerships, net	$ 176,965		$ 183,917
Accrued expenses and other liabilities — Unfunded commitments	52,223		$ 57,243
Tax credits and other tax benefits recognized	9,621	$ 9,452
Amortization expense included in income tax expense	$ 6,950	$ 6,966

Investments in Qualified Affo75

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net [Abstract]
Investments in tax credit and other investments, net	$ 177,023		$ 173,280
Total unfunded commitments for investments in tax credit and other investments	101,800		$ 117,000
Noninterest expense — amortization of tax credit and other investments	$ 14,360	$ 14,155

Goodwill and Other Intangible76

Goodwill and Other Intangible Assets (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2017USD ($)segment	Mar. 31, 2016USD ($)	Dec. 31, 2016USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill	$ 469,433,000	$ 469,433,000	$ 469,433,000
Number of operating segments | segment	3
Goodwill impairment			$ 0
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 1,817,000	2,104,000
Core Deposit Intangibles
Finite-Lived Intangible Assets [Line Items]
Impairment write-downs	0	0
Amortization expense	$ 1,800,000	$ 2,100,000

Goodwill and Other Intangible77

Goodwill and Other Intangible Assets (Details 2) - Core Deposit Intangibles - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross balance	$ 108,814	$ 108,814
Accumulated amortization	82,642	80,825
Total	$ 26,172	$ 27,989

Goodwill and Other Intangible78

Goodwill and Other Intangible Assets (Details 3) - Core Deposit Intangibles - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Year Ended December 31,
Remainder of 2017	$ 5,118
2,018	5,883
2,019	4,864
2,020	3,846
2,021	2,833
Thereafter	3,628
Total	$ 26,172	$ 27,989

Commitments and Contingencies79

Commitments and Contingencies (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Credit Extensions
Loan commitments	$ 5,007,903	$ 5,077,869
Commercial letters of credit and SBLCs	1,695,083	1,525,613
Commercial Letters of Credit
Credit Extensions
Commercial letters of credit and SBLCs	58,700
Standby Letters of Credit
Credit Extensions
Commercial letters of credit and SBLCs	1,640,000
Accrued Expenses and Other Liabilities
Credit Extensions
Allowance for unfunded credit reserves	$ 14,800	$ 15,700

Commitments and Contingencies80

Commitments and Contingencies (Details 2) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
East West Bank | F&F, LLC and 618 Investment, Inc. v. East West Bank
Litigation
Litigation accrual		$ 25,000
Accrued Expenses and Other Liabilities
Other Commitments
Unfunded commitments in investments in AHP and other tax credit investments	$ 154,000	174,300
Loans Sold or Securitized with Recourse
Guarantees
Unpaid principal amount of loans sold or securitized with recourse	139,600	150,500
Loans Sold or Securitized with Recourse | Accrued Expenses and Other Liabilities
Guarantees
Allowance for unfunded credit reserves	$ 333	$ 373

Stock Compensation Plans (Detai

Stock Compensation Plans (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	0	0
Total Stock Compensation Expense and Related Net Tax Benefit [Abstract]
Stock compensation costs	$ 5,151	$ 4,575
Related net tax benefit for stock compensation plans	$ 4,414
Related net tax benefit for stock compensation plans		$ 986
RSUs | Ratably
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
RSUs | Cliff | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
RSUs | Cliff | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	5 years
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	0	0
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	424,299		410,746
Performance-Based RSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential for awards to vest (as a percent)	0.00%
Performance-Based RSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Potential for awards to vest (as a percent)	200.00%
Performance-Based RSUs | Cliff
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years

Stock Compensation Plans (Det82

Stock Compensation Plans (Details 2) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)$ / sharesshares
Time-Based RSUs
Shares
Outstanding at beginning of period (in shares) | shares	1,218,714
Granted (in shares) | shares	330,762
Vested (in shares) | shares	(279,549)
Forfeited (in shares) | shares	(61,193)
Outstanding at end of period (in shares) | shares	1,208,734
Weighted Average Grant-Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 35.92
Granted (in dollars per share) | $ / shares	54.49
Vested (in dollars per share) | $ / shares	36.84
Forfeited (in dollars per share) | $ / shares	39.25
Outstanding at end of period (in dollars per share) | $ / shares	$ 40.62
Total unrecognized compensation cost | $	$ 34.6
Weighted average period to recognize unrecognized compensation cost	2 years 3 months 19 days
Performance-Based RSUs
Shares
Outstanding at beginning of period (in shares) | shares	410,746
Granted (in shares) | shares	131,597
Vested (in shares) | shares	(118,044)
Forfeited (in shares) | shares	0
Outstanding at end of period (in shares) | shares	424,299
Weighted Average Grant-Date Fair Value
Outstanding at beginning of period (in dollars per share) | $ / shares	$ 35.27
Granted (in dollars per share) | $ / shares	56.59
Vested (in dollars per share) | $ / shares	36.85
Forfeited (in dollars per share) | $ / shares	0
Outstanding at end of period (in dollars per share) | $ / shares	$ 41.44
Total unrecognized compensation cost | $	$ 20.2
Weighted average period to recognize unrecognized compensation cost	2 years 4 months 28 days

Stockholders' Equity and Earn83

Stockholders' Equity and Earnings Per Share (Details) - shares	Mar. 31, 2017	Jan. 17, 2014	Jan. 16, 2014
Class of Stock [Line Items]
Shares of East West's common stock into which the warrant may be converted (in shares)		230,282
Number of warrants exercised (in warrants)	0
MetroCorp | MetroCorp
Class of Stock [Line Items]
Shares of East West's common stock into which the warrant may be converted (in shares)			771,429

Stockholders' Equity and Earn84

Stockholders' Equity and Earnings Per Share (Details 2) - Accounting Standards Update 2016-09	3 Months Ended
	Mar. 31, 2017$ / shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Impact on basic earnings per share, ASU 2016-09 (in dollars per share)	$ 0.03
Impact on diluted earnings per share, ASU 2016-09 (in dollars per share)	$ 0.03

Stockholders' Equity and Earn85

Stockholders' Equity and Earnings Per Share (Details 3) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic
Net income	$ 169,736	$ 107,516
Basic weighted average number of shares outstanding (in shares)	144,249	143,958
Basic EPS (in dollars per share)	$ 1.18	$ 0.75
Diluted
Net income	$ 169,736	$ 107,516
Basic weighted average number of shares outstanding (in shares)	144,249	143,958
Diluted potential common shares (in shares)	1,483	845
Diluted weighted average number of shares outstanding (in shares)	145,732	144,803
Diluted EPS (in dollars per share)	$ 1.16	$ 0.74

Stockholders' Equity and Earn86

Stockholders' Equity and Earnings Per Share (Details 4) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average anti-dilutive shares (in shares)	194	13

Accumulated Other Comprehensi87

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 3,427,741	$ 3,122,950
Other comprehensive income	4,628	12,883
Ending balance	3,565,954	3,216,781
Available-for-Sale Investment Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(28,772)	(6,144)
Net unrealized gains (losses) arising during the period	5,055	15,142
Amounts reclassified from AOCI	(1,434)	(2,226)
Other comprehensive income	3,621	12,916
Ending balance	(25,151)	6,772
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(19,374)	(8,797)
Net unrealized gains (losses) arising during the period	1,007	(33)
Amounts reclassified from AOCI	0	0
Other comprehensive income	1,007	(33)
Ending balance	(18,367)	(8,830)
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(48,146)	(14,941)
Net unrealized gains (losses) arising during the period	6,062	15,109
Amounts reclassified from AOCI	(1,434)	(2,226)
Other comprehensive income	4,628	12,883
Ending balance	$ (43,518)	$ (2,058)

Accumulated Other Comprehensi88

Accumulated Other Comprehensive Income (Loss) (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Before-Tax
Net change	$ 7,254	$ 22,255
Tax Effect
Net change	(2,626)	(9,372)
Net-of-Tax
Other comprehensive income	4,628	12,883
Available-for-Sale Investment Securities
Before-Tax
Net unrealized gains (losses) arising during the period	8,721	26,130
Net realized gains reclassified into net income	(2,474)	(3,842)
Net change	6,247	22,288
Tax Effect
Net unrealized gains (losses) arising during the period	(3,666)	(10,988)
Net realized gains reclassified into net income	1,040	1,616
Net change	(2,626)	(9,372)
Net-of-Tax
Net unrealized gains (losses) arising during the period	5,055	15,142
Net realized gains reclassified into net income	(1,434)	(2,226)
Other comprehensive income	3,621	12,916
Foreign Currency Translation Adjustments
Before-Tax
Net unrealized gains (losses) arising during the period	1,007	(33)
Net change	1,007	(33)
Tax Effect
Net unrealized gains (losses) arising during the period	0	0
Net change	0	0
Net-of-Tax
Net unrealized gains (losses) arising during the period	1,007	(33)
Net realized gains reclassified into net income	0	0
Other comprehensive income	$ 1,007	$ (33)

Business Segments (Details)

Business Segments (Details)	3 Months Ended
	Mar. 31, 2017segmentbusiness_division
Segment Reporting [Abstract]
Number of operating segments	3
Number of business divisions | business_division	3
Number of segment whom broad administrative support are provided	2

Business Segments (Details 2)

Business Segments (Details 2) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Segment Reporting Information
Interest income	$ 302,669	$ 276,172
Charge for funds used	(120,414)	(88,280)
Interest spread on funds used	182,255	187,892
Interest expense	(30,547)	(23,968)
Credit on funds provided	120,414	88,280
Interest spread on funds provided	89,867	64,312
Net interest income before provision for credit losses	272,122	252,204
(Reversal of) provision for credit losses	7,068	1,440
Depreciation, amortization and (accretion), net	28,130	12,758
Segment pretax profit (loss)	228,004	144,671
Goodwill	469,433	469,433	$ 469,433
Segment assets	35,342,126	33,109,169	$ 34,788,840
Retail Banking
Segment Reporting Information
Interest income	81,648	77,371
Charge for funds used	(27,860)	(22,652)
Interest spread on funds used	53,788	54,719
Interest expense	(16,173)	(14,606)
Credit on funds provided	102,528	72,431
Interest spread on funds provided	86,355	57,825
Net interest income before provision for credit losses	140,143	112,544
(Reversal of) provision for credit losses	381	(1,582)
Depreciation, amortization and (accretion), net	2,344	43
Segment pretax profit (loss)	73,361	45,945
Goodwill	357,207	357,207
Segment assets	8,213,268	7,203,470
Commercial Banking
Segment Reporting Information
Interest income	191,796	177,082
Charge for funds used	(64,387)	(53,791)
Interest spread on funds used	127,409	123,291
Interest expense	(5,108)	(4,026)
Credit on funds provided	12,061	9,977
Interest spread on funds provided	6,953	5,951
Net interest income before provision for credit losses	134,362	129,242
(Reversal of) provision for credit losses	6,687	3,022
Depreciation, amortization and (accretion), net	(3,474)	(10,773)
Segment pretax profit (loss)	91,798	92,829
Goodwill	112,226	112,226
Segment assets	19,624,237	17,939,537
Other
Segment Reporting Information
Interest income	29,225	21,719
Charge for funds used	(28,167)	(11,837)
Interest spread on funds used	1,058	9,882
Interest expense	(9,266)	(5,336)
Credit on funds provided	5,825	5,872
Interest spread on funds provided	(3,441)	536
Net interest income before provision for credit losses	(2,383)	10,418
(Reversal of) provision for credit losses	0	0
Depreciation, amortization and (accretion), net	29,260	23,488
Segment pretax profit (loss)	62,845	5,897
Goodwill	0	0
Segment assets	$ 7,504,621	$ 7,966,162

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares	Apr. 19, 2017	Mar. 31, 2017	Mar. 31, 2016
Subsequent events
Dividends declared per common share (in dollars per share)		$ 0.2	$ 0.20
Subsequent Event
Subsequent events
Dividends declared per common share (in dollars per share)	$ 0.20