East West Bancorp (EWBC) 10-Q 7 Aug 18 2018 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2018	Jul. 31, 2018
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	Jun. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		144,913,002

Consolidated Balance Sheet

Consolidated Balance Sheet - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and due from banks	$ 415,653	$ 457,181
Interest-bearing cash with banks	1,881,818	1,717,411
Cash and cash equivalents	2,297,471	2,174,592
Interest-bearing deposits with banks	360,900	398,422
Securities purchased under resale agreements (“resale agreements”)	975,000	1,050,000
Securities:
Available-for-sale investment securities, at fair value (includes assets pledged as collateral of $436,773 in 2018 and $534,327 in 2017)	2,707,444	3,016,752
Restricted equity securities, at cost	73,524	73,521
Loans held-for-sale	14,658	85
Loans held-for-investment (net of allowance for loan losses of $301,550 in 2018 and $287,128 in 2017; includes assets pledged as collateral of $19,634,818 in 2018 and $18,880,598 in 2017)	29,928,829	28,688,590
Investments in qualified affordable housing partnerships, net	152,556	162,824
Investments in tax credit and other investments, net	242,595	224,551
Premises and equipment (net of accumulated depreciation of $112,426 in 2018 and $111,898 in 2017)	122,072	121,209
Goodwill	465,547	469,433
Branch assets held-for-sale	0	91,318
Other assets	732,358	678,952
TOTAL	38,072,954	37,150,249
LIABILITIES
Noninterest-bearing	10,739,333	10,887,306
Interest-bearing	22,036,799	20,727,757
Total deposits	32,776,132	31,615,063
Branch liability held-for-sale	0	605,111
Short-term borrowings	58,523	0
Federal Home Loan Bank (“FHLB”) advances	325,020	323,891
Securities sold under repurchase agreements (“repurchase agreements”)	50,000	50,000
Long-term debt	161,704	171,577
Accrued expenses and other liabilities	587,291	542,656
Total liabilities	33,958,670	33,308,298
COMMITMENTS AND CONTINGENCIES (Note 11)
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 165,576,339 and 165,214,770 shares issued in 2018 and 2017, respectively	166	165
Additional paid-in capital	1,754,711	1,755,330
Retained earnings	2,883,201	2,576,302
Treasury stock, at cost — 20,671,710 shares as of both 2018 and 2017	(452,327)	(452,327)
Accumulated other comprehensive loss (“AOCI”), net of tax	(71,467)	(37,519)
Total stockholders’ equity	4,114,284	3,841,951
TOTAL	$ 38,072,954	$ 37,150,249

Consolidated Balance Sheet (Par

Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Available-for-sale securities pledged as collateral	$ 436,773	$ 534,327
Allowance for loan losses	301,550	287,128
Loans held-for-investment pledged as collateral	19,634,818	18,880,598
Premises and equipment, accumulated depreciation	$ 112,426	$ 111,898
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)	165,576,339	165,214,770
Treasury stock, shares (in shares)	20,671,710	20,671,710

Consolidated Statement of Incom

Consolidated Statement of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
INTEREST AND DIVIDEND INCOME
Loans receivable, including fees	$ 365,555	$ 293,039	$ 703,459	$ 565,100
Investment securities	15,059	13,861	30,515	29,108
Resale agreements	7,182	7,853	14,116	17,321
Restricted equity securities	800	470	1,434	1,247
Interest-bearing cash and deposits with banks	11,715	7,552	22,660	12,668
Total interest and dividend income	400,311	322,775	772,184	625,444
INTEREST EXPENSE
Deposits	51,265	27,045	90,401	50,717
Federal funds purchased and other short-term borrowings	124	252	131	665
FHLB advances	2,552	1,761	4,812	3,791
Repurchase agreements	3,042	2,273	5,348	5,416
Long-term debt	1,649	1,353	3,120	2,642
Total interest expense	58,632	32,684	103,812	63,231
Net interest income before provision for credit losses	341,679	290,091	668,372	562,213
Provision for credit losses	15,536	10,685	35,754	17,753
Net interest income after provision for credit losses	326,143	279,406	632,618	544,460
NONINTEREST INCOME
Branch fees	10,140	10,321	20,570	20,245
Letters of credit fees and foreign exchange income	15,673	12,365	25,275	23,806
Ancillary loan fees and other income	5,841	5,907	11,422	10,889
Wealth management fees	4,501	3,381	7,454	7,716
Derivative fees and other income	6,570	3,765	13,260	6,271
Net gains on sales of loans	2,354	1,546	3,936	4,300
Net gains on sales of available-for-sale investment securities	210	2,720	2,339	5,194
Net gains on sales of fixed assets	1,114	1,042	2,200	73,049
Net gain on sale of business	0	0	31,470	0
Other fees and operating income	1,865	6,197	4,786	11,602
Total noninterest income	48,268	47,244	122,712	163,072
NONINTEREST EXPENSE
Compensation and employee benefits	93,865	80,744	189,099	165,347
Occupancy and equipment expense	16,707	15,554	33,587	31,194
Deposit insurance premiums and regulatory assessments	5,832	5,779	12,105	11,708
Legal expense	2,837	2,552	5,092	5,614
Data processing	3,327	3,058	6,728	6,005
Consulting expense	5,120	4,769	7,472	6,688
Deposit related expense	2,922	2,505	5,601	4,870
Computer software expense	5,549	5,462	10,603	9,430
Other operating expense	20,779	20,670	38,386	38,755
Amortization of tax credit and other investments	20,481	27,872	37,881	42,232
Total noninterest expense	177,419	168,965	346,554	321,843
INCOME BEFORE INCOME TAXES	196,992	157,685	408,776	385,689
INCOME TAX EXPENSE	24,643	39,355	49,395	97,623
NET INCOME	$ 172,349	$ 118,330	$ 359,381	$ 288,066
EARNINGS PER SHARE (“EPS”)
BASIC (in dollars per share)	$ 1.19	$ 0.82	$ 2.48	$ 2
DILUTED (in dollars per share)	$ 1.18	$ 0.81	$ 2.46	$ 1.98
WEIGHTED-AVERAGE NUMBER OF SHARES OUTSTANDING
BASIC (in shares)	144,899	144,485	144,782	144,368
DILUTED (in shares)	146,091	145,740	146,046	145,774
CASH DIVIDENDS DECLARED PER COMMON SHARE (in dollars per share)	$ 0.20	$ 0.20	$ 0.40	$ 0.40

Consolidated Statement of Compr

Consolidated Statement of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 172,349	$ 118,330	$ 359,381	$ 288,066
Other comprehensive (loss) income, net of tax:
Net changes in unrealized (losses) gains on available-for-sale investment securities	(8,841)	6,201	(27,653)	9,822
Foreign currency translation adjustments	(6,822)	3,136	(24)	4,143
Other comprehensive (loss) income	(15,663)	9,337	(27,677)	13,965
COMPREHENSIVE INCOME	$ 156,686	$ 127,667	$ 331,704	$ 302,031

Consolidated Statement of Chang

Consolidated Statement 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
Beginning 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		288,066			288,066
Other comprehensive income (loss)		13,965					13,965
Stock compensation costs		10,115		10,115
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)			318,875
Net activity of common stock pursuant to various stock compensation plans and agreements		(11,251)		1,008
Net activity of common stock pursuant to various stock compensation plans and agreements						(12,259)
Cash dividends on common stock		(58,375)			(58,375)
Ending balance (in shares) at Jun. 30, 2017			144,486,326
Ending balance at Jun. 30, 2017		3,670,261		1,738,721	2,417,367	(451,646)	(34,181)
Beginning balance at Mar. 31, 2017							(43,518)
Increase (Decrease) in Stockholders' Equity
Net income		118,330
Other comprehensive income (loss)		9,337					9,337
Ending balance (in shares) at Jun. 30, 2017			144,486,326
Ending balance at Jun. 30, 2017		3,670,261		1,738,721	2,417,367	(451,646)	(34,181)
Increase (Decrease) in Stockholders' Equity
Cumulative effect of change in accounting principle related to marketable equity securities	[1]	(160)			(545)		385
Beginning balance (in shares) at Dec. 31, 2017			144,543,060
Beginning balance at Dec. 31, 2017		3,841,951		1,755,495	2,576,302	(452,327)	(37,519)
Increase (Decrease) in Stockholders' Equity
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate	[2]	0			6,656		(6,656)
Net income		359,381			359,381
Other comprehensive income (loss)		(27,677)					(27,677)
Stock compensation costs		13,215		13,215
Net activity of common stock pursuant to various stock compensation plans and agreements (in shares)			361,569
Net activity of common stock pursuant to various stock compensation plans and agreements		(13,833)		(13,833)
Net activity of common stock pursuant to various stock compensation plans and agreements						0
Cash dividends on common stock		(58,593)			(58,593)
Ending balance (in shares) at Jun. 30, 2018			144,904,629
Ending balance at Jun. 30, 2018		4,114,284		1,754,877	2,883,201	(452,327)	(71,467)
Beginning balance at Mar. 31, 2018							(55,804)
Increase (Decrease) in Stockholders' Equity
Net income		172,349
Other comprehensive income (loss)		(15,663)					(15,663)
Ending balance (in shares) at Jun. 30, 2018			144,904,629
Ending balance at Jun. 30, 2018		$ 4,114,284		$ 1,754,877	$ 2,883,201	$ (452,327)	$ (71,467)
[1]	Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities in the first quarter of 2018. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.
[2]	Represents amounts reclassified from AOCI to retained earnings due to the early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income in the first quarter of 2018. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.

Consolidated Statement of Cash

Consolidated Statement of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 359,381	$ 288,066
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	62,329	79,166
Accretion of discount and amortization of premiums, net	(9,910)	(13,348)
Stock compensation costs	13,215	10,115
Deferred income tax expense	1,320	3,699
Provision for credit losses	35,754	17,753
Net gains on sales of loans	(3,936)	(4,300)
Net gains on sales of available-for-sale investment securities	(2,339)	(5,194)
Net gains on sales of premises and equipment	(2,200)	(73,049)
Net gain on sale of business	(31,470)	0
Originations and purchases of loans held-for-sale	(11,547)	(9,806)
Proceeds from sales and paydowns/payoffs in loans held-for-sale	10,759	9,984
Proceeds from distributions received from equity method investees	1,814	1,185
Net change in accrued interest receivable and other assets	(32,226)	94,438
Net change in accrued expenses and other liabilities	44,016	(14,986)
Other net operating activities	(93)	(733)
Total adjustments	75,486	94,924
Net cash provided by operating activities	434,867	382,990
Net (increase) decrease in:
Loans held-for-investment	(1,147,156)	(1,660,828)
Interest-bearing deposits with banks	28,525	31,060
Investments in qualified affordable housing partnerships, tax credit and other investments	(41,444)	(73,286)
Payment for sale of business, net of cash transferred	(503,687)	0
Purchases of:
Resale agreements	(100,000)	(550,000)
Available-for-sale investment securities	(235,360)	(272,698)
Loans held-for-investment	(389,912)	(368,698)
Premises and equipment	(7,612)	(4,990)
Proceeds from sale of:
Available-for-sale investment securities	256,875	551,889
Loans held-for-investment	274,785	361,380
Other real estate owned (“OREO”)	3,595	5,298
Premises and equipment	0	116,021
Paydowns and maturities of resale agreements	175,000	950,000
Proceeds from distributions received from equity method investees	1,725	2,634
Repayments, maturities and redemptions of available-for-sale investment securities	211,303	244,770
Other net investing activities	(2,200)	21,005
Net cash used in investing activities	(1,475,563)	(646,443)
Net (increase) decrease in:
Deposits	1,195,796	1,245,282
Short-term borrowings	59,895	(36,521)
Proceeds from:
Issuance of common stock pursuant to various stock compensation plans and agreements	1,328	1,008
Payments for:
Repayment of long-term debt	(10,000)	(10,000)
Repurchase of vested shares due to employee tax liability	(15,161)	(12,259)
Cash dividends on common stock	(59,243)	(58,949)
Net cash provided by financing activities	1,172,615	1,128,561
Effect of exchange rate changes on cash and cash equivalents	(9,040)	8,865
NET INCREASE IN CASH AND CASH EQUIVALENTS	122,879	873,973
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	2,174,592	1,878,503
CASH AND CASH EQUIVALENTS, END OF PERIOD	2,297,471	2,752,476
Cash paid during the period for:
Interest paid	99,176	63,416
Income taxes paid, net	67,431	14,799
Noncash investing and financing activities:
Loans transferred from held-for-investment to held-for-sale	$ 285,631	$ 343,977

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	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 and East West’s subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. As of June 30, 2018 , East West also has six wholly-owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 810 , the Trusts are not included on the Consolidated Financial Statements. The unaudited interim Consolidated Financial Statements are 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. They reflect all adjustments that, in the opinion of management, are necessary for fair statement of the interim period Consolidated Financial Statements. Certain items on the Consolidated Financial Statements and notes for the prior periods 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 Consolidated Financial Statements are issued for inclusion in the accompanying Consolidated 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 annual report on Form 10-K for the year ended December 31, 2017 filed with the U.S. Securities and Exchange Commission on February 27, 2018 (the “Company’s 2017 Form 10-K”).

Current Accounting Developments

Current Accounting Developments	6 Months Ended
	Jun. 30, 2018
Accounting Policies [Abstract]
Current Accounting Developments	Current Accounting Developments New Accounting Pronouncements Adopted In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which clarifies the principles for recognizing revenue for contracts to provide goods or services to customers. The guidance also requires new quantitative and qualitative disclosures including the disaggregation of revenues and descriptions of performance obligations. The Company’s revenue is comprised of net interest income and noninterest income. The scope of this new guidance explicitly excludes net interest income, as well as other revenues from financial instruments including loans, leases, securities and derivatives. Accordingly, the majority of the Company’s revenues are not affected. In addition, the new guidance does not materially impact the timing or measurement of the Company’s revenue recognition as it is consistent with the Company’s previously existing accounting for contracts within the scope of the new standard. The Company adopted this guidance as of January 1, 2018 using the modified retrospective method where there was no cumulative effect adjustment to retained earnings as a result of adopting this new guidance. Overall, the guidance did not have a material impact on the Company’s consolidated financial statements. The Company has provided a disaggregation of the significant categories of revenues within the scope of this guidance and expanded the qualitative disclosures of the Company’s noninterest income. See Note 12 — Revenue from Contracts with Customers for additional information. In January 2016, the FASB issued ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. With the exception of the amendments related to equity investments without readily determinable fair values and the use of exit price to measure the fair value of financial instruments for disclosure purposes that were adopted prospectively, the Company adopted all other amendments of the standard effective January 1, 2018 on a modified retrospective basis. The guidance requires investments in marketable equity securities to be accounted for at fair value with unrealized gains or losses reflected in earnings. As of the date of adoption, the Company reclassified approximately $31.9 million of marketable equity securities that were previously classified as Available-for-sale investment securities, at fair value to Investments in tax credits and other investments, net. In addition, the Company recorded a cumulative-effect adjustment as of January 1, 2018 that reduced retained earnings by $545 thousand and increased AOCI by $385 thousand . The guidance also provides a measurement alternative for equity securities without readily determinable fair values to be measured at cost less impairment (if any), plus or minus observable price changes from an identical or similar investment of the same issuer. Such price changes (if any) are reflected in earnings beginning in the period of adoption. As of January 1, 2018, the Company elected the measurement alternative for its privately held cost method investments, which was not a material amount. The Company’s investments in the Federal Reserve Bank of San Francisco (“FRB”) and FHLB stock are not subject to this guidance and continue to be accounted for at cost. In addition, the guidance eliminates the requirement to disclose methods and significant assumptions used to estimate the fair value of financial instruments measured at amortized cost on the Consolidated Balance Sheet. Furthermore, for purposes of disclosing the fair value of financial instruments carried at amortized cost, the Company has updated its valuation methods as necessary to conform to an exit price concept as required by the guidance as of January 1, 2018. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments , to provide guidance on eight specific issues related to classification on the Consolidated Statement of Cash Flows. The specific issues cover cash payments for debt prepayment or debt extinguishment costs; cash outflows for settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowings; contingent consideration payments that are not made soon after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; distributions received from equity method investees; and beneficial interests received in securitization transactions. The guidance also clarifies that in instances of cash flows with multiple aspects that cannot be separately identified, the classification should be based on the activity that is likely to be the predominant source or use of the cash flows. The Company adopted this guidance in the first quarter of 2018 on a retrospective basis. The adoption of this guidance did not have a material impact on the Company’s 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 those amounts that are deemed to be restricted cash and restricted cash equivalents in its cash and cash equivalents balances on the Consolidated Statement of Cash Flows. In addition, the Company is required to explain the changes in the combined total of restricted and unrestricted balances on the Consolidated Statement of Cash Flows. The Company adopted this guidance in the first quarter of 2018 on a retrospective basis. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which narrows the definition of a business by adding an initial screen to determine if substantially all of the fair value of the gross assets acquired is concentrated in a single asset or group of similar assets (a “set”). If the screen is met, the set is not a business. ASU 2017-01 also specifies the minimum inputs and processes required for a set to be considered a business, and it removes the requirement to evaluate a market participant’s ability to replace missing elements when all of the inputs or processes that the seller used in operating a business were not obtained. The Company adopted this guidance in the first quarter of 2018 prospectively. The adoption of this guidance did not have an impact on the Company’s 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. The guidance does not require any accounting changes 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 on January 1, 2019, with early adoption permitted. The guidance should be applied using a modified retrospective transition method, with the cumulative-effect adjustment recognized to retained earnings as of the beginning of the period of adoption. The Company early adopted this guidance in the first quarter of 2018. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In May 2017, the FASB issued ASU 2017-09, Compensation — Stock Compensation (Topic 718): Scope of Modification Accounting , which amends the scope of modification accounting for share-based payment arrangements. Specifically, an entity would not apply modification accounting if the fair value, vesting conditions and classification of the awards are the same immediately before and after the modification. The Company adopted the guidance in the first quarter of 2018 prospectively. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which better aligns the Company’s risk management activities and financial reporting for hedging relationships through changes to both the description and measurement guidance for qualifying hedging relationships. The guidance also changes the presentation of hedge results, expands and refines hedge accounting for both nonfinancial and financial risk components, and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item on the Consolidated Financial Statements. ASU 2017-12 is effective on January 1, 2019, with early adoption permitted. The guidance should be applied using a modified retrospective transition method. The Company early adopted this guidance in the first quarter of 2018, and the adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. In February 2018, the FASB issued ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was signed into law. Under current U.S. GAAP, deferred tax assets and liabilities are to be adjusted for the effect of a change in tax laws or rates in net income of the reporting period that includes the enactment date. This accounting treatment resulted in the tax effect of items within AOCI not reflecting the appropriate tax rate. This guidance permits companies to reclassify the stranded tax effects resulting from the Tax Act from AOCI to retained earnings. The guidance is effective on January 1, 2019, with early adoption permitted. The Company early adopted this guidance in the first quarter of 2018 retrospectively. The Company has identified the unrealized losses for available-for-sale securities to be the only item in AOCI with stranded tax effects, and made a policy election to reclassify the related stranded tax effects using the “investment-by-investment” approach. The adoption of the guidance resulted in a cumulative-effect adjustment as of January 1, 2018 that increased retained earnings by $6.7 million and reduced AOCI by the same amount. Recent Accounting Pronouncements 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. The guidance requires lessees to recognize right-of-use assets and related lease liabilities for all leases with lease terms of more than 12 months on the Consolidated Balance Sheet, and provide quantitative and qualitative disclosures regarding key information about the 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 on January 1, 2019, with early adoption permitted. The guidance should be applied using a modified retrospective transition method through a cumulative-effect adjustment. The Company has completed its review of its existing lease contracts and service contracts that may include embedded leases and is in the process of implementing a new system to address this guidance. The Company expects the adoption of this guidance to result in additional assets and liabilities, as the Company will be required to recognize operating leases on its Consolidated Balance Sheet. The Company does not expect a material impact to its recognition of operating lease expense on its Consolidated Statement of Income and is in the process of evaluating the impacts of adopting the new guidance on its disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The new current expected credit loss (“CECL”) impairment model applies to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loan receivables, available-for-sale and held-to-maturity debt securities, net investments in leases and off-balance sheet credit exposures. The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted in each period for changes in expected lifetime credit losses. ASU 2016-13 also expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loan 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 on January 1, 2020, with early adoption permitted on January 1, 2019. The guidance should be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption. 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 debt securities. The Company’s implementation efforts include, but are not limited to, identifying key interpretive issues, assessing its processes, identifying the system requirements against the new guidance to determine what modifications may be required, evaluating modeling methodologies for its portfolio segments and assessing potential macroeconomic factors that will be used to determine the reasonable and supportable forecast period. 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. Under this guidance, an entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, an impairment loss will be recognized when the carrying amount of a reporting unit exceeds its fair value. The guidance also eliminates the requirement to perform a qualitative assessment for any reporting units with a zero or negative carrying amount. ASU 2017-04 is effective on January 1, 2020 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 does not expect the adoption of this guidance to have a material impact on the Company’s Consolidated Financial Statements.

Dispositions and Held-for-Sale

Dispositions and Held-for-Sale	6 Months Ended
	Jun. 30, 2018
Dispositions And Held-For-Sale Classification [Abstract]
Dispositions and Held-for-Sale	Dispositions and Held-for-Sale In the first quarter of 2017, the Company completed the sale and leaseback of a commercial property in San Francisco, California for cash consideration of $120.6 million , and entered into a leaseback with the buyer for part of the property, consisting of a retail branch and office facilities. The net book value of the property was $31.6 million at the time of the sale, resulting in a pre-tax gain of $85.4 million after considering $3.6 million in selling costs. As the leaseback is an operating lease, $71.7 million of the gain was recognized on the closing date, and $13.7 million was deferred and will be recognized over the term of the lease agreement. The Company reports a business as held-for-sale when management has approved or received approval to sell the business and is committed to a formal plan, the business is available for immediate sale, the business is being actively marketed, the sale is anticipated to occur during the next 12 months and certain other specific criteria are met. A business classified as held-for-sale is recorded at the lower of its carrying amount or estimated fair value less costs to sell. If the carrying amount of the business exceeds its estimated fair value, a loss is recognized. Depreciation and amortization expense are not recorded with respect to the assets of a business after it is classified as held-for-sale. On November 11, 2017, the Bank entered into a Purchase and Assumption Agreement to sell all of its eight Desert Community Bank (“DCB”) branches located in the High Desert area of Southern California, and related assets and liability to Flagstar Bank, a wholly-owned subsidiary of Flagstar Bancorp, Inc. The Company determined that this transaction met the criteria for held-for-sale as of December 31, 2017 . Branch assets held-for-sale as of December 31, 2017 were largely comprised of $78.1 million in loans held-for-sale and $8.0 million in premises and equipment, net. Branch liability held-for-sale as of December 31, 2017 was comprised of $605.1 million in deposits. The sale of the Bank’s eight DCB branches was completed on March 17, 2018. The assets and liability of the DCB branches that were sold in this transaction primarily consisted of $613.7 million of deposits, $59.1 million of loans, $9.0 million of cash and cash equivalents and $7.9 million of premises and equipment. The transaction resulted in a net cash payment of $499.9 million by the Company to Flagstar Bank. After transaction costs, the sale resulted in a pre-tax gain of $31.5 million in the six months ended June 30, 2018 , which was reported as Net gain on sale of business on the Consolidated Statement of Income.

Fair Value Measurement and Fair

Fair Value Measurement and Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurement and Fair Value of Financial Instruments	Fair Value Measurement and Fair Value of Financial Instruments Fair Value Determination Fair value is defined as the price that would be received to sell an asset or the price that would be paid to transfer a liability in an orderly transaction between market participants at the measurement date. In determining the fair value of financial instruments, 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 an asset or a 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 traded in active markets; quoted prices for identical or similar instruments traded 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. The classification of assets and liabilities within the hierarchy is based on whether inputs to the valuation methodology used are observable or unobservable, and the significance of those inputs in the fair value measurement. 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. Level 3 Assets and Liabilities Valuation Process The Company generally determines the fair value of Level 3 assets and liabilities by using internal valuation methodologies, which primarily include discounted cash flows techniques that require both observable and unobservable inputs. Unobservable inputs (such as volatility and liquidity discount) are generally derived from historic performance of similar instruments or determined from previous market trades in similar instruments. Such inputs can be derived from similar portfolios with known historic experience or recent trades where particular unobservable inputs may be implied. The Company compares each unobservable input to historic experience and other third-party data where available. The models developed under internal valuation methodologies are subject to review according to the Company’s risk management policies and procedures, which include model validation. Model validation assesses the adequacy and appropriateness of the model, including reviewing its supporting documentation and key components such as inputs, logic, processing components and output results. Validation also includes ensuring significant unobservable model inputs are appropriate given observable market transactions or other market data within the same or similar asset classes. The Company has ongoing monitoring procedures in place for Level 3 assets and liabilities that use internal valuation methodologies, which include but are not limited to the following: • review of valuation results against expectations, including review of significant or unusual value fluctuations; and • quarterly analysis related to market data, where available. Assets and Liabilities Measured at Fair Value on a Recurring Basis The following section describes the valuation methodologies used by the Company to measure financial assets and liabilities on a recurring basis, as well as the general classification of these instruments pursuant to the fair value hierarchy. 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 primarily comprised of U.S. Treasury securities. The fair value of other available-for-sale investment securities is 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 reviewed the methodologies used to develop the resulting fair value. The available-for-sale investment securities valued using such methods are classified as Level 2. Equity Securities — Equity securities were comprised of mutual funds as of both June 30, 2018 and December 31, 2017 . The Company uses Net Asset Value (“NAV”) information to determine the fair value of these equity securities. When NAV is available periodically and the equity securities can be put back to the transfer agents at the publicly available NAV, the fair value of the equity securities is classified as Level 1. When NAV is available periodically but the equity securities may not be readily marketable at its periodic NAV in the secondary market, the fair value of these equity securities is 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 fair value of the interest rate options, which consist 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 fall below (rise above) the strike rate of the floors (caps). 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 model-derived credit spreads, which are Level 3 inputs. As of June 30, 2018 , the Company has assessed the significance of the impact of the credit valuation adjustments on the overall valuation of these interest rate contracts 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 instruments as Level 2 due to the observable nature of the significant inputs utilized. Foreign Exchange Forwards, Spot and Swaps — The Company enters into short-term foreign exchange contracts to accommodate the business needs of its customers. For a majority of the foreign exchange contracts entered into with its customers, the Company entered into offsetting foreign exchange contracts with third party financial institutions to manage its exposure. The Company also utilizes foreign exchange contracts that are not designated as hedging instruments to mitigate the economic effect of fluctuations in certain foreign currency on-balance sheet assets and liabilities, primarily foreign currency denominated deposits that it offers to its customers. The fair value is determined at each reporting period based on changes in the foreign exchange rates. 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. Due to the short-term nature of the majority of these contracts, the counterparties’ credit risks are considered nominal and result 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 exchange contracts are classified as Level 2. During the six months ended June 30, 2018 , the Company entered into foreign currency forward contracts to hedge its net investment in its China subsidiary, East West Bank (China) Limited, a non-U.S. Dollar (“USD”) functional currency subsidiary in China. These foreign currency forward contracts were designated as net investment hedges. A s of December 31, 2017 , foreign exchange forward contracts were used to economically hedge the Company’s net investment in East West Bank (China) Limited. The fair value of foreign currency forward contracts is valued by comparing the contracted foreign exchange rate to the current market foreign exchange rate. Key inputs of the current market exchange rate include forward rates and the interest rate curves 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 credit risk participation agreements (“RPAs”) with institutional counterparties, under which the Company assumes its pro-rata share of the credit exposure associated with a 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. Accordingly, RPAs fall within Level 2. Equity Warrants — The Company obtained warrants to purchase preferred and common stock of technology and life sciences companies as part of the loan origination process. As of June 30, 2018 and December 31, 2017 , the warrants included on the Consolidated Financial Statements were from both public and private companies. The Company valued these warrants based on the Black-Scholes option pricing model. For warrants from public companies, the model uses the underlying stock price, stated strike price, warrant expiration date, risk-free interest rate based on a duration-matched U.S. Treasury rate and market-observable company-specific option volatility as inputs to value the warrants. Due to the observable nature of the inputs used in deriving the estimated fair value, warrants from public companies are classified as Level 2. For warrants from private companies, the model uses inputs such as the offering price observed in the most recent round of funding, stated strike price, warrant expiration date, risk-free interest rate based on duration-matched U.S. Treasury rate and option volatility. The model values are then adjusted for a general lack of liquidity due to the private nature of the underlying companies. Due to the unobservable nature of the option volatility and liquidity discount assumptions used in deriving the estimated fair value, warrants from private companies are classified as Level 3. On a quarterly basis, the changes in the fair value of warrants from private companies are reviewed for reasonableness, and a sensitivity analysis on the option volatility and liquidity discount assumptions is performed. Commodity Swaps and Options — The Company enters into energy commodity swaps and options with its commercial loan customers to allow them to hedge against the risk of fluctuation in energy commodity prices. The fair value of the commodity option contracts is determined using the Black’s model and assumptions that include expectations of future commodity price and volatility. The future commodity contract price is derived from observable inputs such as the market price of the commodity. Commodity swaps are structured as an exchange of fixed cash flows for floating cash flows. The fixed cash flows are predetermined based on the known volumes and fixed price as specified in the swap agreement. The floating cash flows are correlated with the change of forward commodity prices, which is derived from market corroborated futures settlement prices. The fair value of the commodity 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) based on the market prices of the commodity. As a result, the Company classifies these derivative instruments as Level 2 due to the observable nature of the significant inputs utilized. The following tables present financial assets and liabilities that are measured at fair value on a recurring basis as of June 30, 2018 and December 31, 2017 : ($ in thousands) Assets (Liabilities) Measured at Fair Value on a Recurring Basis 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 $ 629,270 $ 629,270 $ — $ — U.S. government agency and U.S. government sponsored enterprise debt securities 240,042 — 240,042 — U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 337,237 — 337,237 — Residential mortgage-backed securities 936,447 — 936,447 — Municipal securities 73,619 — 73,619 — Non-agency residential mortgage-backed securities: Investment grade 7,835 — 7,835 — Corporate debt securities: Investment grade 11,001 — 11,001 — Foreign bonds: Investment grade 459,433 — 459,433 — Asset-backed securities: Investment grade 12,560 — 12,560 — Total available-for-sale investment securities $ 2,707,444 $ 629,270 $ 2,078,174 $ — Investments in tax credit and other investments: Equity securities with readily determinable fair value (1) $ 30,929 $ 20,431 $ 10,498 $ — Total investments in tax credit and other investments $ 30,929 $ 20,431 $ 10,498 $ — Derivative assets: Interest rate swaps and options $ 64,225 $ — $ 64,225 $ — Foreign exchange forwards, spot and swaps 11,724 — 11,724 — RPAs 1 — 1 — Equity warrants 1,878 — 1,230 648 Commodity swaps and options 3,628 — 3,628 — Total derivative assets $ 81,456 $ — $ 80,808 $ 648 Derivative liabilities: Interest rate swaps and options $ 100,025 $ — $ 100,025 $ — Foreign exchange forwards, spot and swaps 11,281 — 11,281 — RPAs 77 — 77 — Commodity swaps and options 3,159 — 3,159 — Total derivative liabilities $ 114,542 $ — $ 114,542 $ — (1) Equity securities with readily determinable fair value were comprised of mutual funds as of June 30, 2018 . ($ in thousands) Assets (Liabilities) Measured at Fair Value on a Recurring Basis Fair Value Measurements Quoted Prices in Significant Significant Unobservable Inputs (Level 3) Available-for-sale investment securities: U.S. Treasury securities $ 640,280 $ 640,280 $ — $ — U.S. government agency and U.S. government sponsored enterprise debt securities 203,392 — 203,392 — U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 318,957 — 318,957 — Residential mortgage-backed securities 1,190,271 — 1,190,271 — Municipal securities 99,982 — 99,982 — Non-agency residential mortgage-backed securities: Investment grade 9,117 — 9,117 — Corporate debt securities: Investment grade 37,003 — 37,003 — Foreign bonds: Investment grade 486,408 — 486,408 — Other securities 31,342 20,735 10,607 — Total available-for-sale investment securities $ 3,016,752 $ 661,015 $ 2,355,737 $ — Derivative assets: Interest rate swaps and options $ 58,633 $ — $ 58,633 $ — Foreign exchange forwards, spot and swaps 5,840 — 5,840 — RPAs 1 — 1 — Equity warrants 1,672 — 993 679 Total derivative assets $ 66,146 $ — $ 65,467 $ 679 Derivative liabilities: Interest rate swaps $ 6,799 $ — $ 6,799 $ — Interest rate swaps and options 57,958 — 57,958 — Foreign exchange forwards, spot and swaps 10,170 — 10,170 — RPAs 8 — 8 — Total derivative liabilities $ 74,935 $ — $ 74,935 $ — 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. As of June 30, 2018 and December 31, 2017 , the only assets measured on a recurring basis that were classified as Level 3 were equity warrants issued by private companies. The following table presents a reconciliation of the beginning and ending balances for these warrants for the three and six months ended June 30, 2018 : ($ in thousands) Three Months Ended Six Months Ended June 30, 2018 June 30, 2018 Equity warrants Beginning balance $ 931 $ 679 Total (losses) gains included in earnings (1) (76 ) 168 Issuances 26 34 Settlements (233 ) (233 ) Ending balance $ 648 $ 648 (1) Includes unrealized (losses) gains of $(13) thousand and $231 thousand for the three and six months ended June 30, 2018 , respectively. The realized/unrealized (losses) gains are included in Ancillary loan fees and other income on the Consolidated Statement of Income. Transfers into or out of fair value hierarchy classifications are made if the significant inputs used in the financial models measuring the fair value of the assets and liabilities become observable or unobservable in the current marketplace. The Company’s policy, with respect to transfers between levels of the fair value hierarchy, is to recognize transfers into and out of each level as of the end of the reporting period. There were no transfers of assets and liabilities measured on a recurring basis into and out of Level 1, Level 2 or Level 3 during the three and six months ended June 30, 2018 and 2017 . The following table presents quantitative information about the significant unobservable inputs used in the valuation of assets measured on a recurring basis classified as Level 3 as of June 30, 2018 . The significant unobservable inputs presented in the table below are those that the Company considers significant to the fair value of the Level 3 assets. The Company considers unobservable inputs to be significant if, by their exclusion, the fair value of the Level 3 assets would be impacted by a predetermined percentage change. ($ in thousands) Fair Value Measurements (Level 3) Valuation Technique Unobservable Input(s) Weighted- Average Derivative assets: Equity warrants $ 648 Black-Scholes option pricing model Volatility 47% Liquidity discount 47% Assets and Liabilities Measured at Fair Value on a Nonrecurring Basis From time to time, the Company may be required to measure certain assets at fair value on a nonrecurring basis in accordance with U.S. GAAP. The adjustments to fair value generally require the assets to be recorded at the lower of cost or fair value, or assessed for impairment. 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 impairment on certain non-PCI loans, application of fair value less costs to sell on OREO or lower of cost or fair value on loans held-for-sale. Non-PCI Impaired Loans — The Company typically adjusts the carrying amount of impaired loans when there is evidence of probable loss and when the expected fair value of the loan is less than its carrying amount. Impaired loans with specific reserves are classified as Level 3 assets. The following two methods are used to derive the fair value of impaired loans: • Discounted cash flows valuation techniques generally consist of developing an expected stream of cash flows over the life of the loans and then valuing the loans at the present value by discounting the expected cash flows at a designated discount rate. • The Company establishes a specific reserve for an impaired loan based on the fair value of the underlying collateral, which may take the form of real estate, inventory, equipment, contracts or guarantees. The fair value of the underlying collateral is generally based on third-party appraisals, or an internal evaluation if a third-party appraisal is not required by regulations, which utilize one or more valuation techniques such as income, market and/or cost approaches. Other Real Estate Owned — The Company’s OREO represents properties acquired through foreclosure, or through full or partial satisfaction of loans held-for-investment. These OREO properties are recorded at estimated fair value less the costs to sell at the time of foreclosure or at the lower of cost or estimated fair value less the costs to sell subsequent to acquisition. On a monthly basis, the current fair market value of each OREO property is reviewed to ensure that the current carrying value is appropriate. OREO properties are classified as Level 3. The following tables present the carrying amounts of assets included on the Consolidated Balance Sheet that had fair value changes measured on a nonrecurring basis as of June 30, 2018 and December 31, 2017 : 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 lending: Commercial and industrial (“C&I”) $ 18,574 $ — $ — $ 18,574 Commercial real estate (“CRE”) 3,053 — — 3,053 Consumer lending: Single-family residential 2,584 — — 2,584 Home equity lines of credit (“HELOCs”) 924 — — 924 Total non-PCI impaired loans $ 25,135 $ — $ — $ 25,135 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 lending: C&I $ 31,404 $ — $ — $ 31,404 CRE 2,667 — — 2,667 Construction and land 3,973 — — 3,973 Consumer lending: Single-family residential 144 — — 144 Total non-PCI impaired loans $ 38,188 $ — $ — $ 38,188 OREO $ 9 $ — $ — $ 9 The following table presents the total change in value of assets for which a fair value adjustment has been included on the Consolidated Statements of Income for the three and six months ended June 30, 2018 and 2017 and held as of those dates: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Non-PCI impaired loans: Commercial lending: C&I $ 4,544 $ (14,060 ) $ 595 $ (11,418 ) CRE 66 193 (23 ) 118 Multifamily residential — (106 ) — (107 ) Construction and land — — — (147 ) Consumer lending: Single-family residential — 76 15 158 HELOCs (73 ) 24 (73 ) 25 Total non-PCI impaired loans nonrecurring fair value gains (losses) $ 4,537 $ (13,873 ) $ 514 $ (11,371 ) OREO nonrecurring fair value losses $ — $ — $ — $ (285 ) 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 June 30, 2018 and December 31, 2017 : ($ in thousands) Fair Value Valuation Unobservable Input(s) Range(s) of Input(s) Weighted- Average June 30, 2018 Non-PCI impaired loans $ 21,048 Discounted cash flows Discount 4% — 7% 6% $ 3,167 Fair value of property Selling cost 8% 8% $ 318 Fair value of collateral Discount 15% 15% $ 602 Fair value of collateral Contract value NM NM December 31, 2017 Non-PCI impaired loans $ 22,802 Discounted cash flows Discount 4% — 10% 6% $ 9,773 Fair value of property Selling cost 8% 8% $ 3,207 Fair value of collateral Discount 20% — 32% 29% $ 2,406 Fair value of collateral Contract value NM NM OREO $ 9 Fair value of property Selling cost 8% 8% NM — Not meaningful. Disclosures about Fair Value of Financial Instruments The following tables present the fair value estimates for financial instruments as of June 30, 2018 and December 31, 2017 , excluding financial instruments recorded at fair value on a recurring basis as they are included in the tables presented elsewhere in Note 4 — Fair Value Measurement and Fair Value of Financial Instruments . The carrying amounts in the following tables are recorded on the Consolidated Balance Sheet under the indicated captions, except for accrued interest receivable and mortgage servicing rights that are included in Other assets, and accrued interest payable that is included in Accrued expenses and other liabilities. These financial assets and liabilities are measured at amortized cost basis on the Company’s Consolidated Balance Sheet. During the first quarter of 2018 , the Company adopted ASU 2016-01 and has updated its valuation methods as necessary to conform to an “exit price” concept as required by ASU 2016-01. ($ in thousands) June 30, 2018 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 2,297,471 $ 2,297,471 $ — $ — $ 2,297,471 Interest-bearing deposits with banks $ 360,900 $ — $ 360,900 $ — $ 360,900 Resale agreements (1) $ 975,000 $ — $ 946,643 $ — $ 946,643 Restricted equity securities, at cost $ 73,524 $ — $ 73,524 $ — $ 73,524 Loans held-for-sale $ 14,658 $ — $ 14,658 $ — $ 14,658 Loans held-for-investment, net $ 29,928,829 $ — $ — $ 30,073,212 $ 30,073,212 Mortgage servicing rights $ 7,865 $ — $ — $ 12,111 $ 12,111 Accrued interest receivable $ 128,339 $ — $ 128,339 $ — $ 128,339 Financial liabilities: Demand, checking, savings and money market deposits $ 24,916,109 $ — $ 24,916,109 $ — $ 24,916,109 Time deposits $ 7,860,023 $ — $ 7,835,585 $ — $ 7,835,585 Short-term borrowings $ 58,523 $ — $ 58,523 $ — $ 58,523 FHLB advances $ 325,020 $ — $ 337,544 $ — $ 337,544 Repurchase agreements (1) $ 50,000 $ — $ 114,944 $ — $ 114,944 Long-term debt $ 161,704 $ — $ 167,573 $ — $ 167,573 Accrued interest payable $ 15,360 $ — $ 15,360 $ — $ 15,360 (1) Resale and repurchase agreements are reported net pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements . As of June 30, 2018 , $400.0 million out of $450.0 million of repurchase agreements were eligible for netting against resale agreements. ($ in thousands) December 31, 2017 Carrying Level 1 Level 2 Level 3 Estimated Financial assets: Cash and cash equivalents $ 2,174,592 $ 2,174,592 $ — $ — $ 2,174,592 Interest-bearing deposits with banks $ 398,422 $ — $ 398,422 $ — $ 398,422 Resale agreements (1) $ 1,050,000 $ — $ 1,035,158 $ — $ 1,035,158 Restricted equity securities, at cost $ 73,521 $ — $ 73,521 $ — $ 73,521 Loans held-for-sale $ 85 $ — $ 85 $ — $ 85 Loans held-for-investment, net $ 28,688,590 $ — $ — $ 28,956,349 $ 28,956,349 Branch assets held-for-sale $ 91,318 $ 5,143 $ 10,970 $ 78,132 $ 94,245 Mortgage servicing rights $ 7,771 $ — $ — $ 11,324 $ 11,324 Accrued interest receivable $ 121,719 $ — $ 121,719 $ — $ 121,719 Financial liabilities: Demand, checking, savings and money market deposits $ 25,974,314 $ — $ 25,974,314 $ — $ 25,974,314 Time deposits $ 5,640,749 $ — $ 5,626,855 $ — $ 5,626,855 Branch liability held-for-sale $ 605,111 $ — $ — $ 643,937 $ 643,937 FHLB advances $ 323,891 $ — $ 335,901 $ — $ 335,901 Repurchase agreements (1) $ 50,000 $ — $ 104,830 $ — $ 104,830 Long-term debt $ 171,577 $ — $ 171,673 $ — $ 171,673 Accrued interest payable $ 10,724 $ — $ 10,724 $ — $ 10,724 (1) Resale and repurchase agreements are reported net pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements . As of December 31, 2017 , $400.0 million out of $450.0 million of repurchase agreements were eligible for netting against resale agreements.

Securities Purchased under Resa

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements	6 Months Ended
	Jun. 30, 2018
Resale and Repurchase Agreements [Abstract]
Securities Purchased under Resale Agreements and Sold under Repurchase Agreements	Securities Purchased under Resale Agreements and Sold under Repurchase Agreements Resale Agreements Resale agreements are recorded at the values 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 $1.38 billion and $1.45 billion as of June 30, 2018 and December 31, 2017 , respectively. The weighted-average interest rates were 2.63% and 2.43% as of June 30, 2018 and December 31, 2017 , respectively. Repurchase Agreements Long-term repurchase agreements are accounted for as collateralized financing transactions and recorded at the values at which the securities are sold. The collateral for the repurchase agreements is primarily comprised of U.S. Treasury securities, U.S. government agency and U.S. government sponsored enterprise mortgage-backed 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 $450.0 million as of both June 30, 2018 and December 31, 2017 . The weighted-average interest rates were 4.60% and 3.65% as of June 30, 2018 and December 31, 2017 , respectively. Balance Sheet Offsetting The Company’s resale and repurchase agreements are transacted under legally enforceable master repurchase agreements that provide the Company, in the event of default by the counterparty, the right to liquidate securities held and to offset receivables and payables with the same counterparty. The Company nets resale and repurchase transactions with the same counterparty on the Consolidated Balance Sheet when it has a legally enforceable master netting agreement and the transactions are eligible for netting under ASC 210-20-45-11. Collateral received includes securities that are not recognized on the Consolidated Balance Sheet. Collateral pledged consists of securities that are not netted on the Consolidated Balance Sheet against the related collateralized liability. Collateral received or pledged in resale and repurchase agreements with other financial institutions may also be sold or re-pledged by the secured party, but is usually delivered to and held by the third party trustees. The collateral amounts received/pledged are limited for presentation purposes to the related recognized asset/liability balance for each counterparty, and accordingly, do not include excess collateral received/pledged. The following tables present the resale and repurchase agreements included on the Consolidated Balance Sheet as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Financial Collateral Net Amount Resale agreements $ 1,375,000 $ (400,000 ) $ 975,000 $ — $ (966,410 ) (1) $ 8,590 Gross Amounts Gross Amounts Net Amounts of on the Gross Amounts Not Offset on the Liabilities Financial Collateral Net Amount Repurchase agreements $ 450,000 $ (400,000 ) $ 50,000 $ — $ (50,000 ) (2) $ — ($ in thousands) December 31, 2017 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Financial Collateral Received Net Amount Resale agreements $ 1,450,000 $ (400,000 ) $ 1,050,000 $ — $ (1,045,696 ) (1) $ 4,304 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Liabilities Financial Collateral Net Amount Repurchase agreements $ 450,000 $ (400,000 ) $ 50,000 $ — $ (50,000 ) (2) $ — (1) 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. (2) 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	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Securities	Securities The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of available-for-sale investment securities carried at fair value, as of June 30, 2018 and December 31, 2017 : June 30, 2018 ($ in thousands) Amortized Gross Gross Fair Available-for-sale investment securities: U.S. Treasury securities $ 648,271 $ — $ (19,001 ) $ 629,270 U.S. government agency and U.S. government sponsored enterprise debt securities 244,688 49 (4,695 ) 240,042 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 352,547 10 (15,320 ) 337,237 Residential mortgage-backed securities 958,173 1,920 (23,646 ) 936,447 Municipal securities 74,596 206 (1,183 ) 73,619 Non-agency residential mortgage-backed securities: Investment grade (1) 8,004 — (169 ) 7,835 Corporate debt securities: Investment grade (1) 11,250 — (249 ) 11,001 Foreign bonds: Investment grade (1) (2) 489,340 — (29,907 ) 459,433 Asset-backed securities: Investment grade (1) 12,604 — (44 ) 12,560 Total available-for-sale investment securities $ 2,799,473 $ 2,185 $ (94,214 ) $ 2,707,444 December 31, 2017 ($ in thousands) Amortized Gross Gross Fair Available-for-sale investment securities: U.S. Treasury securities $ 651,395 $ — $ (11,115 ) $ 640,280 U.S. government agency and U.S. government sponsored enterprise debt securities 206,815 62 (3,485 ) 203,392 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 328,348 141 (9,532 ) 318,957 Residential mortgage-backed securities 1,199,869 3,964 (13,562 ) 1,190,271 Municipal securities 99,636 655 (309 ) 99,982 Non-agency residential mortgage-backed securities: Investment grade (1) 9,136 3 (22 ) 9,117 Corporate debt securities: Investment grade (1) 37,585 164 (746 ) 37,003 Foreign bonds: Investment grade (1) (2) 505,396 24 (19,012 ) 486,408 Other securities (3) 31,887 — (545 ) 31,342 Total available-for-sale investment securities $ 3,070,067 $ 5,013 $ (58,328 ) $ 3,016,752 (1) Available-for-sale investment securities rated BBB- or higher by Standard & Poor’s (“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 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 value of foreign bonds include $445.1 million and $456.1 million of multilateral development bank bonds as of June 30, 2018 and December 31, 2017 , respectively. (3) Other securities are comprised of mutual funds, which are equity securities with readily determinable fair value. Prior to the adoption of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, these securities were reported as available-for-sale investment securities with changes in fair value recorded through other comprehensive income. Upon adoption of ASU 2016-01, which became effective January 1, 2018, these securities were reclassified from Available-for-sale investment securities to Investments in tax credit and other investments, net , with changes in fair value recorded through net income. Unrealized Losses The following tables present the gross unrealized losses and related fair value of the Company’s investment portfolio, aggregated by investment category and the length of time that individual security has been in a continuous unrealized loss position, as of June 30, 2018 and December 31, 2017 : June 30, 2018 ($ 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 $ 192,840 $ (4,227 ) $ 436,430 $ (14,774 ) $ 629,270 $ (19,001 ) U.S. government agency and U.S. government sponsored enterprise debt securities 141,270 (3,667 ) 86,287 (1,028 ) 227,557 (4,695 ) U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 133,352 (3,911 ) 189,400 (11,409 ) 322,752 (15,320 ) Residential mortgage-backed securities 467,178 (10,405 ) 317,707 (13,241 ) 784,885 (23,646 ) Municipal securities 24,453 (755 ) 8,334 (428 ) 32,787 (1,183 ) Non-agency residential mortgage-backed securities: Investment grade 7,835 (169 ) — — 7,835 (169 ) Corporate debt securities: Investment grade 9,754 (246 ) 1,247 (3 ) 11,001 (249 ) Foreign bonds: Investment grade 76,266 (3,158 ) 383,167 (26,749 ) 459,433 (29,907 ) Asset-backed securities: Investment grade 12,560 (44 ) — — 12,560 (44 ) Total available-for-sale investment securities $ 1,065,508 $ (26,582 ) $ 1,422,572 $ (67,632 ) $ 2,488,080 $ (94,214 ) December 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 $ 168,061 $ (1,005 ) $ 472,219 $ (10,110 ) $ 640,280 $ (11,115 ) U.S. government agency and U.S. government sponsored enterprise debt securities 99,935 (623 ) 85,281 (2,862 ) 185,216 (3,485 ) U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 113,775 (2,071 ) 191,827 (7,461 ) 305,602 (9,532 ) Residential mortgage-backed securities 413,621 (4,205 ) 361,809 (9,357 ) 775,430 (13,562 ) Municipal securities 8,490 (123 ) 8,588 (186 ) 17,078 (309 ) Non-agency residential mortgage-backed securities: Investment grade 4,599 (22 ) — — 4,599 (22 ) Corporate debt securities: Investment grade — — 11,905 (746 ) 11,905 (746 ) Foreign bonds: Investment grade 103,149 (1,325 ) 352,239 (17,687 ) 455,388 (19,012 ) Other securities (1) 31,215 (545 ) — — 31,215 (545 ) Total available-for-sale investment securities $ 942,845 $ (9,919 ) $ 1,483,868 $ (48,409 ) $ 2,426,713 $ (58,328 ) (1) Other securities are comprised of mutual funds, which are equity securities with readily determinable fair value. Prior to the adoption of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , these securities were reported as available-for-sale investment securities with changes in fair value recorded through other comprehensive income. Upon adoption of ASU 2016-01, which became effective January 1, 2018, these securities were reclassified from Available-for-sale investment securities, at fair value to Investments in tax credit and other investments, net , with changes in fair value recorded through net income. Other-Than-Temporary Impairment For each reporting period, the Company examines all individual securities that are in an unrealized loss position for Other-Than-Temporary-Impairment (“OTTI”). For a discussion of the factors and criteria the Company uses in analyzing securities for OTTI, see Note 1 — Summary of Significant Accounting Policies — Securities to the Consolidated Financial Statements of the Company’s 2017 Form 10-K. The unrealized losses were primarily attributable to the movement in the yield curve, 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 presented in the previous tables are temporary and no credit losses are expected. As a result, the Company expects to recover the entire amortized cost basis of these securities. Accordingly, no impairment losses were recorded on the Company’s Consolidated Statement of Income for each of the three and six months ended June 30, 2018 and 2017 . As of June 30, 2018 , the Company had 193 available-for-sale investment securities in a gross unrealized loss position with no credit impairment, primarily consisting of 113 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities, 22 U.S. Treasury securities and 16 investment grade foreign bonds. In comparison, as of December 31, 2017 , the Company had 165 available-for-sale investment securities in a gross unrealized loss position with no credit impairment, primarily consisting of 98 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities, 25 U.S. Treasury securities and 16 investment grade foreign bonds. No OTTI credit losses were recognized for each of the three and six months ended June 30, 2018 and 2017 . Realized Gains and Losses The following table presents the proceeds, gross realized gains and tax expense related to the sales of available-for-sale investment securities for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Proceeds from sales $ 42,085 $ 249,233 $ 256,875 $ 551,889 Gross realized gains $ 210 $ 2,720 $ 2,339 $ 5,194 Related tax expense $ 62 $ 1,144 $ 690 $ 2,184 Scheduled Maturities of Investment Securities The following table presents the scheduled maturities of available-for-sale investment securities as of June 30, 2018 : ($ in thousands) Amortized Cost Fair Value Due within one year $ 632,583 $ 603,002 Due after one year through five years 697,172 675,324 Due after five years through ten years 199,008 194,040 Due after ten years 1,270,710 1,235,078 Total available-for-sale investment securities $ 2,799,473 $ 2,707,444 Actual maturities of mortgage-backed securities can differ from contractual maturities as the 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. As of June 30, 2018 and December 31, 2017 , available-for-sale investment securities with fair value of $436.8 million and $534.3 million , respectively, were primarily pledged to secure public deposits, repurchase agreements and for other purposes required or permitted by law. Restricted Equity Securities Restricted equity securities include the FRB and the FHLB stock. Restricted equity securities are carried at cost as these securities do not have a readily determinable fair value. The following table presents the restricted equity securities as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 FRB stock $ 56,274 $ 56,271 FHLB stock 17,250 17,250 Total $ 73,524 $ 73,521

Derivatives

Derivatives	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives The Company uses derivatives to manage exposure to market risk, primarily 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 rate 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 Sheet 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 2017 Form 10-K. The following table presents the total notional and gross fair value of the Company’s derivatives as of June 30, 2018 and December 31, 2017 . The derivative asset and liability balances are presented on a gross basis, prior to the application of master netting arrangements, as included in Other assets and Accrued expenses and other liabilities , respectively, on the Consolidated Balance Sheet. ($ in thousands) June 30, 2018 December 31, 2017 Notional Amount Fair Value Notional Amount Fair Value Derivative Assets Derivative Liabilities Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Fair value hedges: Interest rate swaps $ 35,811 $ — $ 8,647 $ 35,811 $ — $ 6,799 Net investment hedges: Foreign exchange forwards 95,515 2,316 — — — — Total derivatives designated as hedging instruments $ 131,326 $ 2,316 $ 8,647 $ 35,811 $ — $ 6,799 Derivatives not designated as hedging instruments: Interest rate swaps and options $ 11,217,468 $ 64,225 $ 91,378 $ 9,333,860 $ 58,633 $ 57,958 Foreign exchange forwards, spot and swaps 959,645 9,408 11,281 770,215 5,840 10,170 RPAs 118,024 1 77 49,033 1 8 Equity warrants — (1) 1,878 — — (1) 1,672 — Commodity swaps and options — (2) 3,628 3,159 — — — Total derivatives not designated as hedging instruments $ 12,295,137 $ 79,140 $ 105,895 $ 10,153,108 $ 66,146 $ 68,136 (1) The Company held warrants in four public companies and 14 private companies as of June 30, 2018 . In comparison, the Company held warrants in four public companies and 11 private companies as of December 31, 2017 . (2) The notional amount of the Company’s commodity contracts entered with its customers totaled 1.8 million barrels of oil and 5.2 million units of natural gas, measured in million British thermal units (“MMBTUs”) as of June 30, 2018 . The Company entered into the same notional amounts of commodity contracts with mirrored terms with third party financial institutions to mitigate its exposure. Derivatives Designated as Hedging Instruments Fair Value Hedges — 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, the London Interbank Offered Rate. The Company entered into interest rate swaps, which were designated as fair value hedges. The interest rate swaps 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. The total notional amounts of the interest rate swaps on certificates of deposit were $35.8 million as of both June 30, 2018 and December 31, 2017 . The fair value liabilities of the interest rate swaps were $8.6 million and $6.8 million as of June 30, 2018 and December 31, 2017 , respectively. The following table presents the net (losses) gains recognized on the Consolidated Statement of Income related to the derivatives designated as fair value hedges for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended Six Months Ended 2018 2017 2018 2017 (Losses) gains recorded in interest expense: Recognized on interest rate swaps $ (396 ) $ (706 ) $ (1,848 ) $ (1,523 ) Recognized on certificates of deposit $ 440 $ 664 $ 1,719 $ 1,352 The following table presents the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of the hedged certificates of deposit as of June 30, 2018 : ($ in thousands) June 30, 2018 Hedged Items Currently Designated Carrying Amount of the Hedged Assets (Liabilities) (1) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets (Liabilities) Certificates of deposit $ (29,339 ) $ 6,464 (1) Represents the full carrying amount of the hedged certificates of deposit as of June 30, 2018. Net Investment Hedges — ASC 830-20, Foreign Currency Matters — Foreign Currency Transactions , and ASC 815, Derivatives and Hedging , allows hedging of the foreign currency risk of a net investment in a foreign operation. The Company enters into foreign currency forward contracts to hedge its investment in East West Bank (China) Limited, a non-USD functional currency subsidiary of the Company 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 East West Bank (China) Limited, against the risk of adverse changes in the foreign currency exchange rate. The Company may de-designate the net investment hedges when the Company expects the hedge will cease to be highly effective. The portion of the net investment hedges recorded through the point of de-designation is included in the Foreign Currency Translation Adjustment within AOCI and will be reclassified into earnings only upon the sale or liquidation of the China subsidiary. During the first quarter of 2018, the Company entered into new foreign currency forward contracts designated as net investment hedges to hedge against the foreign currency exchange rate risk in connection with its investment in East West Bank (China) Limited. As of June 30, 2018 , the total notional amount and fair value of the foreign currency forward contracts designated as net investment hedges were $95.5 million and a $2.3 million asset, respectively. As of December 31, 2017 , there were no derivative contracts designated as net investment hedges. As a result of the adoption of ASU 2017-12 effective January 1, 2018, the Company recorded fair value gains of $4.9 million and $3.8 million in the Foreign Currency Translation Adjustment within AOCI during the three and six months ended June 30, 2018 , respectively. During the three months ended June 30, 2017 , there were no net investment hedges designated and recorded. During the six months ended June 30, 2017 , before the adoption of ASU 2017-12, the Company recorded a loss of $648 thousand in the Foreign Currency Translation Adjustment within AOCI related to the effective portion of the net investment hedges, and a loss of $2.0 million in the Letters of credit fees and foreign exchange income on the Consolidated Statement of Income related to the ineffective portion of the net investment hedges. Derivatives Not Designated as Hedging Instruments Interest Rate Swaps and Options — The Company enters into interest rate derivatives, which include 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 offsetting interest rate contracts with third party financial institutions. Beginning in January 2018, the London Clearing House (“LCH”) amended its rulebook to legally characterize variation margin payments made to and received from LCH as settlement of derivatives and not as collateral against derivatives. Applying variation margin payments as settlement to LCH cleared derivative transactions resulted in a reduction in derivative asset and liability fair values of $32.2 million and $2.9 million , respectively, as of June 30, 2018 . Included in the total notional amount of $5.61 billion of interest rates swaps and options entered with financial counterparties is a notional amount of $1.55 billion of interest rate swaps that cleared through LCH with a fair value asset of approximately $241 thousand as of June 30, 2018 . The following tables represent the notional amounts and the gross fair values of interest rate derivative contracts outstanding as of June 30, 2018 and December 31, 2017 , respectively. ($ in thousands) June 30, 2018 Customer Counterparties Financial Counterparties Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Written options $ 843,965 $ — $ 696 Purchased options $ 843,965 $ 711 $ — Sold collars and corridors 335,169 147 1,004 Collars and corridors 335,169 1,015 147 Swaps 4,425,902 15,902 76,297 Swaps 4,433,298 46,450 13,234 Total $ 5,605,036 $ 16,049 $ 77,997 Total $ 5,612,432 $ 48,176 $ 13,381 ($ in thousands) December 31, 2017 Customer Counterparties Financial Counterparties Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Written options $ 691,548 $ — $ 223 Purchased options $ 691,548 $ 233 $ — Sold collars and corridors 247,542 204 267 Collars and corridors 247,542 271 211 Swaps 3,724,295 32,241 24,879 Swaps 3,731,385 25,684 32,378 Total $ 4,663,385 $ 32,445 $ 25,369 Total $ 4,670,475 $ 26,188 $ 32,589 Foreign Exchange Forwards, Spot and Swaps — The Company enters into foreign exchange contracts with its customers, consisting of forwards, spot and swap contracts to accommodate the business needs of its customers. For a majority of the foreign exchange contracts entered into with its customers, the Company entered into offsetting foreign exchange contracts with third party financial institutions to manage its exposure. The Company also utilizes foreign exchange contracts that are not designated as hedging instruments to mitigate the economic effect of fluctuations in certain foreign currency on-balance sheet assets and liabilities, primarily foreign currency denominated deposits that it offers to its customers. A majority of the foreign exchange contracts have original maturities of one year or less. The following tables represent the notional amounts and the gross fair values of foreign exchange derivative contracts outstanding as of June 30, 2018 and December 31, 2017 , respectively: ($ in thousands) June 30, 2018 Customer Counterparty Financial Counterparty Notional Amount Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 353,439 $ 5,298 $ 3,778 $ 77,152 $ 47 $ 462 Swaps 19,031 2 874 510,023 4,061 6,167 Total $ 372,470 $ 5,300 $ 4,652 $ 587,175 $ 4,108 $ 6,629 ($ in thousands) December 31, 2017 Customer Counterparty Financial Counterparty Notional Amount Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 163,389 $ 2,189 $ 752 $ 155,872 $ 662 $ 7,800 Swaps 4,318 — 98 446,636 2,989 1,520 Total $ 167,707 $ 2,189 $ 850 $ 602,508 $ 3,651 $ 9,320 Credit Risk Participation Agreements — The Company may periodically enter into RPAs to manage the credit exposure on interest rate contracts associated with a syndicated loan. The Company may enter into protection sold or protection purchased RPAs with institutional counterparties to decrease or increase its exposure to a borrower. Under the RPA, the Company will receive or make a payment if a borrower defaults on the related interest rate contract. The Company manages its credit risk on RPAs by monitoring the creditworthiness of the borrowers and institutional counterparties, which is based on the normal credit review process. The notional amount of the RPAs reflects the Company’s pro-rata share of the derivative instrument. The following table represents the notional amounts and the gross fair values of RPAs purchased and sold outstanding as of June 30, 2018 and December 31, 2017 , respectively: ($ in thousands) June 30, 2018 December 31, 2017 Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities RPAs - protection sold $ 105,754 $ — $ 77 $ 35,208 $ — $ 8 RPAs - protection purchased 12,270 1 — 13,825 1 — Total RPAs $ 118,024 $ 1 $ 77 $ 49,033 $ 1 $ 8 Assuming all underlying borrowers referenced in the interest rate derivative contracts defaulted as of June 30, 2018 and December 31, 2017 , the exposure from the RPAs with protections sold would be $962 thousand and $419 thousand , respectively. As of June 30, 2018 and December 31, 2017 , the weighted-average remaining maturities of the outstanding RPAs were 6.7 years and 6.0 years , respectively. Equity Warrants — The Company has obtained warrants to purchase preferred and common stock of technology and life sciences companies, as part of the loan origination process. The Company held warrants in four public companies and 14 private companies as of June 30, 2018 , and held warrants in four public companies and 11 private companies as of December 31, 2017 . The fair value of the warrants held in public and private companies was a $1.9 million asset and a $1.7 million asset as of June 30, 2018 and December 31, 2017 , respectively. Commodity Swaps and Options — In 2018, the Company entered into energy commodity contracts in the form of swaps and options with its commercial loan customers to allow them to hedge against the risk of fluctuation in energy commodity prices. To economically hedge against the risk of fluctuation in commodity prices in the products offered to its customers, the Company entered into offsetting commodity contracts with third party financial institutions. Beginning in January 2017, the Chicago Mercantile Exchange (“CME”) amended its rulebook to legally characterize variation margin payments made to and received from CME as settlement of derivatives and not as collateral against derivatives. Applying variation margin payments as settlement to CME cleared derivative transactions resulted in a reduction in derivative asset and liability fair values of $271 thousand and $595 thousand , respectively, as of June 30, 2018 . As a result, the notional quantity totaling 264 thousand barrels of oil and 5.2 million MMBTUs of natural gas that cleared through CME had an insignificant fair value as of June 30, 2018 . The notional amounts and fair values of the commodity derivative positions outstanding as of June 30, 2018 are presented in the following table. The Company did not have any commodity contracts in 2017. ($ in thousands) June 30, 2018 Customer Counterparties Financial Counterparties Notional Fair Value Notional Fair Value Unit Amount Assets Liabilities Unit Amount Assets Liabilities Crude oil: Crude oil: Written options Barrels 736,500 $ 576 $ 271 Purchased options Barrels 736,500 $ — $ 510 Collars Barrels 812,100 1,720 — Collars Barrels 812,100 — 1,499 Swaps Barrels 292,811 925 — Swaps Barrels 292,811 — 863 Total 1,841,411 $ 3,221 $ 271 Total 1,841,411 $ — $ 2,872 Natural gas: Natural gas: Collars MMBTUs 1,540,000 $ 85 $ — Collars MMBTUs 1,540,000 $ — $ 4 Swaps MMBTUs 3,650,000 322 — Swaps MMBTUs 3,650,000 — 12 Total 5,190,000 $ 407 $ — Total 5,190,000 $ — $ 16 Total $ 3,628 $ 271 Total $ — $ 2,888 The following table presents the net gains (losses) recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Location in Consolidated Statement of Income Three Months Ended Six Months Ended 2018 2017 2018 2017 Derivatives not designated as hedging instruments: Interest rate swaps and options Derivative fees and other income $ 88 $ (678 ) $ 1,194 $ (1,744 ) Foreign exchange spot and forwards Letters of credit fees and foreign exchange income 2,646 8,378 6,503 14,216 RPAs Derivative fees and other income (56 ) — (69 ) 1 Equity warrants Ancillary loan fees and other income 598 786 439 786 Commodity swaps and options Derivative fees and other income 40 — 40 — Net gains $ 3,316 $ 8,486 $ 8,107 $ 13,259 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. As of June 30, 2018 and December 31, 2017 , the aggregate fair value of all derivative instruments with such credit-risk-related contingent features that are in a net liability position was $11.4 million and $6.3 million , respectively, with collateral posted of $11.3 million and $6.2 million , respectively. In the event that East West Bank’s credit rating had been downgraded to below investment grade, the additional collateral that would have been required to be posted as of June 30, 2018 and December 31, 2017 would have been minimal. Offsetting of Derivatives The Company has entered into agreements with certain counterparty financial institutions, which include master netting agreements. However, the Company has elected to account for all derivatives with counterparty institutions on a gross basis. The following tables present gross derivatives on the Consolidated Balance Sheet and the respective collateral received or pledged in the form of other financial instruments, which are generally marketable securities and/or cash. The collateral amounts in these tables are limited to the outstanding balances of the related asset or liability (after netting is applied); thus instances of overcollateralization are not shown: ($ in thousands) As of June 30, 2018 Total Contracts Not Subject to Master Netting Arrangements Contracts Subject to Master Netting Arrangements Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Net Amounts Gross Amounts Not Offset on the Derivative Amount Collateral Net Amount Derivative Assets $ 81,456 $ 27,141 $ 54,315 $ — $ 54,315 $ (18,672 ) (1) $ (33,615 ) (2) $ 2,028 Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Net Amounts Gross Amounts Not Offset on the Derivative Amount Collateral Net Amount Derivative Liabilities $ 114,542 $ 82,965 $ 31,577 $ — $ 31,577 $ (18,672 ) (1) $ (12,889 ) (3) $ 16 ($ in thousands) As of December 31, 2017 Total Contracts Not Subject to Master Netting Arrangements Contracts Subject to Master Netting Arrangements Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Gross Amounts Not Offset on the Derivative Collateral Net Amount Derivative Assets $ 66,146 $ 36,941 $ 29,205 $ — $ 29,205 $ (18,955 ) (1) $ (9,839 ) (2) $ 411 Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Gross Amounts Not Offset on the Derivative Collateral Net Amount Derivative Liabilities $ 74,935 $ 26,732 $ 48,203 $ — $ 48,203 $ (18,955 ) (1) $ (28,796 ) (3) $ 452 (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 cash and securities received against derivative assets with the same counterparty that are subject to enforceable master netting arrangements, including $10.1 million and $8.6 million of cash collateral received as of June 30, 2018 and December 31, 2017 , respectively. (3) Represents cash and securities pledged against derivative liabilities with the same counterparty that are subject to enforceable master netting arrangements, including $4.1 million and $10.7 million of cash collateral posted as of June 30, 2018 and December 31, 2017 , respectively. In addition to the amounts included in the tables 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	6 Months Ended
	Jun. 30, 2018
Loans and Leases Receivable Disclosure [Abstract]
Loans Receivable and Allowance for Credit Losses	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 for which 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 June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 Non-PCI Loans (1) PCI Loans (2) Total (1)(2) Non-PCI Loans (1) PCI Loans (2) Total (1)(2) Commercial lending: C&I $ 11,056,225 $ 2,794 $ 11,059,019 $ 10,685,436 $ 11,795 $ 10,697,231 CRE 8,836,076 218,491 9,054,567 8,659,209 277,688 8,936,897 Multifamily residential 1,988,464 44,058 2,032,522 1,855,128 61,048 1,916,176 Construction and land 623,794 43 623,837 659,326 371 659,697 Total commercial lending 22,504,559 265,386 22,769,945 21,859,099 350,902 22,210,001 Consumer lending: Single-family residential 5,210,014 106,881 5,316,895 4,528,911 117,378 4,646,289 HELOCs 1,758,093 11,418 1,769,511 1,768,917 14,007 1,782,924 Other consumer 374,028 — 374,028 336,504 — 336,504 Total consumer lending 7,342,135 118,299 7,460,434 6,634,332 131,385 6,765,717 Total loans held-for-investment $ 29,846,694 $ 383,685 $ 30,230,379 $ 28,493,431 $ 482,287 $ 28,975,718 Allowance for loan losses (301,511 ) (39 ) (301,550 ) (287,070 ) (58 ) (287,128 ) Loans held-for-investment, net $ 29,545,183 $ 383,646 $ 29,928,829 $ 28,206,361 $ 482,229 $ 28,688,590 (1) Includes net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts of $(40.4) million and $(34.0) million as of June 30, 2018 and December 31, 2017 , respectively. (2) Includes ASC 310-30 discount of $26.8 million and $35.3 million as of June 30, 2018 and December 31, 2017 , respectively. The commercial lending portfolio includes C&I, CRE, multifamily residential, and construction and land loans. The consumer lending portfolio includes single-family residential, HELOCs and other consumer loans. The C&I loan portfolio, which is comprised of commercial business and trade finance loans, provides financing to businesses in a wide spectrum of industries. The CRE loan portfolio includes income producing real estate loans that are either owner occupied, or non-owner occupied where 50% or more of the debt service for the loan is provided by rental income. The multifamily residential loan portfolio is largely comprised of loans secured by smaller multifamily properties ranging from 5 to 15 units in the Bank’s primary lending areas. Construction loans mainly provide construction financing for hotels, multifamily and residential condominiums, as well as mixed use (residential and retail) structures. In the consumer lending portfolio, the Company offers residential loans through a variety of first lien mortgage loan programs. The consumer residential loan portfolio is largely comprised of single-family residential loans and HELOCs that were originated through a reduced documentation loan program, where a substantial down payment is required, resulting in a low loan-to-value ratio at origination, typically 60% or less. The Company is in a first lien position for many of these reduced documentation single-family residential loans and HELOCs. These loans have historically experienced low delinquency and default rates. Other consumer loans are mainly comprised of insurance premium financing loans. As of June 30, 2018 and December 31, 2017 , loans totaling $19.63 billion and $18.88 billion , respectively, were pledged to secure borrowings and to provide additional borrowing capacity from the FRB and the FHLB. Credit Quality Indicators All loans are subject to the Company’s internal and external credit review and monitoring. For the commercial lending portfolio, 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 the majority of the consumer lending portfolio, 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 classifies loans 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 loans that have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special Mention loans are loans that have potential weaknesses that warrant closer attention by management. Special Mention is 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 loans that have well-defined weaknesses that may jeopardize the full and timely repayment of the loan. Substandard loans have a distinct possibility of loss, if the deficiencies are not corrected. When management has assessed a potential for loss but a distinct possibility of loss is not recognizable, the loan remains classified as Substandard grade. Doubtful loans have insufficient sources of repayment and a high probability of loss. Loss loans are loans that are 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 ratings for non-PCI loans by portfolio segment as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 Pass/Watch Special Mention Substandard Doubtful Total Non-PCI Loans Commercial lending: C&I $ 10,760,675 $ 180,741 $ 113,518 $ 1,291 $ 11,056,225 CRE 8,672,374 63,315 100,387 — 8,836,076 Multifamily residential 1,978,241 — 10,223 — 1,988,464 Construction and land 571,921 690 51,183 — 623,794 Total commercial lending 21,983,211 244,746 275,311 1,291 22,504,559 Consumer lending: Single-family residential 5,193,906 4,063 12,045 — 5,210,014 HELOCs 1,748,719 1,188 8,186 — 1,758,093 Other consumer 371,530 7 2,491 — 374,028 Total consumer lending 7,314,155 5,258 22,722 — 7,342,135 Total $ 29,297,366 $ 250,004 $ 298,033 $ 1,291 $ 29,846,694 ($ in thousands) December 31, 2017 Pass/Watch Special Mention Substandard Doubtful Total Non-PCI Loans Commercial lending: C&I $ 10,369,516 $ 114,769 $ 180,269 $ 20,882 $ 10,685,436 CRE 8,484,635 65,616 108,958 — 8,659,209 Multifamily residential 1,839,958 — 15,170 — 1,855,128 Construction and land 614,441 4,590 40,295 — 659,326 Total commercial lending 21,308,550 184,975 344,692 20,882 21,859,099 Consumer lending: Single-family residential 4,490,672 16,504 21,735 — 4,528,911 HELOCs 1,744,903 11,900 12,114 — 1,768,917 Other consumer 333,895 111 2,498 — 336,504 Total consumer lending 6,569,470 28,515 36,347 — 6,634,332 Total $ 27,878,020 $ 213,490 $ 381,039 $ 20,882 $ 28,493,431 The following tables present the credit risk ratings for PCI loans by portfolio segment as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 Pass/Watch Special Mention Substandard Doubtful Total PCI Loans Commercial lending: C&I $ 2,551 $ — $ 243 $ — $ 2,794 CRE 189,307 4,813 24,371 — 218,491 Multifamily residential 41,182 — 2,876 — 44,058 Construction and land 43 — — — 43 Total commercial lending 233,083 4,813 27,490 — 265,386 Consumer lending: Single-family residential 105,219 275 1,387 — 106,881 HELOCs 10,705 209 504 — 11,418 Total consumer lending 115,924 484 1,891 — 118,299 Total (1) $ 349,007 $ 5,297 $ 29,381 $ — $ 383,685 ($ in thousands) December 31, 2017 Pass/Watch Special Mention Substandard Doubtful Total PCI Loans Commercial lending: C&I $ 10,712 $ 57 $ 1,026 $ — $ 11,795 CRE 238,605 531 38,552 — 277,688 Multifamily residential 56,720 — 4,328 — 61,048 Construction and land 44 — 327 — 371 Total commercial lending 306,081 588 44,233 — 350,902 Consumer lending: Single-family residential 113,905 1,543 1,930 — 117,378 HELOCs 12,642 — 1,365 — 14,007 Total consumer lending 126,547 1,543 3,295 — 131,385 Total (1) $ 432,628 $ 2,131 $ 47,528 $ — $ 482,287 (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, unless the loan is well-collateralized or guaranteed by government agencies, and in the process of collection. Non-PCI loans that are less than 90 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 June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 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 Commercial lending: C&I $ 86,959 $ 6 $ 86,965 $ 28,491 $ 28,606 $ 57,097 $ 10,912,163 $ 11,056,225 CRE 2,913 — 2,913 5,851 19,897 25,748 8,807,415 8,836,076 Multifamily residential 1,378 536 1,914 1,727 — 1,727 1,984,823 1,988,464 Construction and land — — — — — — 623,794 623,794 Total commercial lending 91,250 542 91,792 36,069 48,503 84,572 22,328,195 22,504,559 Consumer lending: Single-family residential 18,699 4,678 23,377 418 7,207 7,625 5,179,012 5,210,014 HELOCs 6,018 1,188 7,206 1,889 6,246 8,135 1,742,752 1,758,093 Other consumer 20 7 27 — 2,491 2,491 371,510 374,028 Total consumer lending 24,737 5,873 30,610 2,307 15,944 18,251 7,293,274 7,342,135 Total $ 115,987 $ 6,415 $ 122,402 $ 38,376 $ 64,447 $ 102,823 $ 29,621,469 $ 29,846,694 ($ in thousands) December 31, 2017 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 Commercial lending: C&I $ 30,964 $ 82 $ 31,046 $ 27,408 $ 41,805 $ 69,213 $ 10,585,177 $ 10,685,436 CRE 3,414 466 3,880 5,430 21,556 26,986 8,628,343 8,659,209 Multifamily residential 4,846 14 4,860 1,418 299 1,717 1,848,551 1,855,128 Construction and land 758 — 758 — 3,973 3,973 654,595 659,326 Total commercial lending 39,982 562 40,544 34,256 67,633 101,889 21,716,666 21,859,099 Consumer lending: Single-family residential 13,269 5,355 18,624 6 5,917 5,923 4,504,364 4,528,911 HELOCs 4,286 4,186 8,472 89 3,917 4,006 1,756,439 1,768,917 Other consumer 14 23 37 — 2,491 2,491 333,976 336,504 Total consumer lending 17,569 9,564 27,133 95 12,325 12,420 6,594,779 6,634,332 Total $ 57,551 $ 10,126 $ 67,677 $ 34,351 $ 79,958 $ 114,309 $ 28,311,445 $ 28,493,431 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 2017 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. Refer to the discussion on PCI loans within this note for additional details on interest income recognition. As of June 30, 2018 and December 31, 2017 , PCI loans on nonaccrual status totaled $6.3 million and $5.3 million , respectively. Loans in Process of Foreclosure As of June 30, 2018 and December 31, 2017 , consumer mortgage loans of $5.6 million and $6.6 million , respectively, were secured by residential real estate properties, for which formal foreclosure proceedings were in process in accordance with local requirements of the applicable jurisdictions. As of June 30, 2018 , there were no foreclosed residential real estate properties included in total net OREO of $709 thousand . In comparison, a foreclosed residential real estate property with a carrying amount of $188 thousand was included in total net OREO of $830 thousand as of December 31, 2017 . Troubled Debt Restructurings Potential troubled debt restructurings (“TDR”s) are individually evaluated and the type of restructuring is selected based on the loan type and the circumstances of the borrower’s financial difficulty. A TDR is a modification of the terms of a loan when the Company, for economic or legal reasons related to the borrower’s financial difficulties, grants a concession to the borrower that it would not have otherwise considered. The following tables present the additions to non-PCI TDRs for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Loans Modified as TDRs During the Three Months Ended June 30, 2018 2017 Number Pre- Modification Post- Modification (1) Financial (2) Number Pre- Modification Post- Modification (1) Financial (2) Commercial lending: C&I — $ — $ — $ — 6 $ 17,039 $ 15,673 $ 10,010 CRE 1 $ 750 $ 837 $ — — $ — $ — $ — Multifamily residential — $ — $ — $ — 1 $ 3,655 $ 3,638 $ 107 Consumer lending: Single-family residential 2 $ 405 $ 404 $ (26 ) — $ — $ — $ — HELOCs 2 $ 1,546 $ 1,536 $ — — $ — $ — $ — Loans Modified as TDRs During the Six Months Ended June 30, ($ in thousands) 2018 2017 Number Pre- Post- (1) Financial (2) Number Pre- Post- (1) Financial (2) Commercial lending: C&I — $ — $ — $ — 8 $ 18,189 $ 17,272 $ 11,202 CRE 1 $ 750 $ 837 $ — 1 $ 1,527 $ 1,494 $ — Multifamily residential — $ — $ — $ — 1 $ 3,655 $ 3,638 $ 107 Consumer lending: Single-family residential 2 $ 405 $ 404 $ (26 ) — $ — $ — $ — HELOCs 2 $ 1,546 $ 1,536 $ — — $ — $ — $ — (1) Includes subsequent payments after modification and reflects the balance as of June 30, 2018 and 2017 . (2) The financial impact includes increases (decreases) in charge-offs and specific reserves recorded at the modification date. The following tables present the non-PCI TDR modifications for the three and six months ended June 30, 2018 and 2017 by modification type: ($ in thousands) Modification Type During the Three Months Ended June 30, 2018 2017 Principal (1) Principal (2) Interest Other Total Principal (1) Principal (2) Interest Other Total Commercial lending: C&I $ — $ — $ — $ — $ — $ 3,388 $ 12,285 $ — $ — $ 15,673 CRE — — 837 — 837 — — — — — Multifamily residential — — — — — 3,638 — — — 3,638 Total commercial lending — — 837 — 837 7,026 12,285 — — 19,311 Consumer lending: Single-family residential 65 — — 339 404 — — — — — HELOCs 1,464 — — 72 1,536 — — — — — Total consumer lending 1,529 — — 411 1,940 — — — — — Total $ 1,529 $ — $ 837 $ 411 $ 2,777 $ 7,026 $ 12,285 $ — $ — $ 19,311 ($ in thousands) Modification Type During the Six Months Ended June 30, 2018 2017 Principal (1) Principal (2) Interest Other Total Principal (1) Principal (2) Interest Other Total Commercial lending: C&I $ — $ — $ — $ — $ — $ 3,388 $ 13,884 $ — $ — $ 17,272 CRE — — 837 — 837 1,494 — — — 1,494 Multifamily residential — — — — — 3,638 — — — 3,638 Total commercial lending — — 837 — 837 8,520 13,884 — — 22,404 Consumer lending: Single-family residential 65 — — 339 404 — — — — — HELOCs 1,464 — — 72 1,536 — — — — — Total consumer lending 1,529 — — 411 1,940 — — 846 — — Total $ 1,529 $ — $ 837 $ 411 $ 2,777 $ 8,520 $ 13,884 $ 6,722 $ — $ 22,404 (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 be in default. 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 tables present information on loans modified as TDRs within the previous 12 months that have subsequently defaulted during the three and six months ended June 30, 2018 and 2017 , and were still in default at the respective period end: ($ in thousands) Loans Modified as TDRs that Subsequently Defaulted During the Three Months Ended June 30, 2018 2017 Number of Recorded Number of Recorded Consumer lending: HELOCs — $ — 1 $ 48 ($ in thousands) Loans Modified as TDRs that Subsequently Defaulted During the Six Months Ended June 30, 2018 2017 Number of Recorded Number of Recorded Consumer lending: HELOCs — $ — 1 $ 48 The amount of additional funds committed to lend to borrowers whose terms have been modified was $2.9 million and $5.1 million as of June 30, 2018 and December 31, 2017 , respectively. Impaired Loans The following tables present information on non-PCI impaired loans as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Commercial lending: C&I $ 85,975 $ 27,397 $ 36,257 $ 63,654 $ 10,920 CRE 38,567 26,677 5,469 32,146 520 Multifamily residential 6,562 2,998 3,104 6,102 99 Total commercial lending 131,104 57,072 44,830 101,902 11,539 Consumer lending: Single-family residential 17,109 4,037 11,879 15,916 53 HELOCs 9,642 4,493 4,989 9,482 78 Other consumer 2,491 — 2,491 2,491 2,491 Total consumer lending 29,242 8,530 19,359 27,889 2,622 Total non-PCI impaired loans $ 160,346 $ 65,602 $ 64,189 $ 129,791 $ 14,161 ($ in thousands) December 31, 2017 Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Commercial lending: C&I $ 130,773 $ 36,086 $ 62,599 $ 98,685 $ 16,094 CRE 41,248 28,699 6,857 35,556 684 Multifamily residential 11,164 8,019 2,617 10,636 88 Construction and land 4,781 3,973 — 3,973 — Total commercial lending 187,966 76,777 72,073 148,850 16,866 Consumer lending: Single-family residential 15,501 — 14,338 14,338 534 HELOCs 5,484 2,287 2,921 5,208 4 Other consumer 2,491 — 2,491 2,491 2,491 Total consumer lending 23,476 2,287 19,750 22,037 3,029 Total non-PCI impaired loans $ 211,442 $ 79,064 $ 91,823 $ 170,887 $ 19,895 The following table presents the average recorded investment and interest income recognized on non-PCI impaired loans for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Average Recognized Interest Income (1) Average Recognized Interest Income (1) Average Recorded Investment Recognized Interest Income (1) Average Recognized Interest Income (1) Commercial lending: C&I $ 67,342 $ 1,494 $ 113,858 $ 140 $ 67,290 $ 2,893 $ 119,608 $ 362 CRE 32,524 837 37,897 33 32,813 1,666 38,116 80 Multifamily residential 6,161 58 12,720 81 6,203 127 12,771 129 Construction and land — — 4,414 — — — 4,584 — Total commercial lending 106,027 2,389 168,889 254 106,306 4,686 175,079 571 Consumer lending: Single-family residential 15,962 115 16,985 35 16,012 269 17,038 93 HELOCs 9,502 138 4,541 13 9,514 249 4,548 32 Other consumer 2,491 47 — — 2,491 92 — — Total consumer lending 27,955 300 21,526 48 28,017 610 21,586 125 Total non-PCI impaired loans $ 133,982 $ 2,689 $ 190,415 $ 302 $ 134,323 $ 5,296 $ 196,665 $ 696 (1) Includes interest recognized on accruing non-PCI TDRs. Interest payments received on nonaccrual non-PCI loans are reflected as a reduction to principal, not as interest income. Allowance for Credit Losses The following table presents a summary of activities in the allowance for loan losses by portfolio segment for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Non-PCI Loans Allowance for non-PCI loans, beginning of period $ 297,607 $ 263,007 $ 287,070 $ 260,402 Provision for loan losses on non-PCI loans 15,139 10,680 35,072 18,726 Gross charge-offs: Commercial lending: C&I (13,534 ) (5,386 ) (31,979 ) (12,443 ) Construction and land — (1 ) — (149 ) Consumer lending: Single-family residential — (1 ) (1 ) (1 ) Other consumer (162 ) (3 ) (179 ) (7 ) Total gross charge-offs (13,696 ) (5,391 ) (32,159 ) (12,600 ) Gross recoveries: Commercial lending: C&I 511 7,038 8,198 7,493 CRE 2 423 429 992 Multifamily residential 1,061 128 1,394 695 Construction and land 258 88 693 112 Consumer lending: Single-family residential 629 243 813 254 HELOCs — — — 24 Other consumer — 22 1 140 Total gross recoveries 2,461 7,942 11,528 9,710 Net (charge-offs) recoveries (11,235 ) 2,551 (20,631 ) (2,890 ) Allowance for non-PCI loans, end of period 301,511 276,238 301,511 276,238 PCI Loans Allowance for PCI loans, beginning of period 47 87 58 118 Reversal of loan losses on PCI loans (8 ) (9 ) (19 ) (40 ) Allowance for PCI loans, end of period 39 78 39 78 Allowance for loan losses $ 301,550 $ 276,316 $ 301,550 $ 276,316 For further information on accounting policies and the methodologies 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 2017 Form 10-K. The following table presents a summary of activities in the allowance for unfunded credit reserves for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended Six Months Ended 2018 2017 2018 2017 Allowance for unfunded credit reserves, beginning of period $ 13,614 $ 15,174 $ 13,318 $ 16,121 Provision for (reversal of) unfunded credit reserves 405 14 701 (933 ) Allowance for unfunded credit reserves, end of period $ 14,019 $ 15,188 $ 14,019 $ 15,188 The allowance for unfunded credit reserves is maintained at a level management believes to be sufficient to absorb estimated probable losses related to unfunded credit facilities. The allowance for unfunded credit reserves is included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. 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 June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 Commercial Lending Consumer Lending C&I CRE Multifamily Residential Construction and Land Single- Family Residential HELOCs Other Consumer Total Allowance for loan losses Individually evaluated for impairment $ 10,920 $ 520 $ 99 $ — $ 53 $ 78 $ 2,491 $ 14,161 Collectively evaluated for impairment 151,484 44,061 18,387 30,362 33,335 7,199 2,522 287,350 Acquired with deteriorated credit quality — 39 — — — — — 39 Total $ 162,404 $ 44,620 $ 18,486 $ 30,362 $ 33,388 $ 7,277 $ 5,013 $ 301,550 Recorded investment in loans Individually evaluated for impairment $ 63,654 $ 32,146 $ 6,102 $ — $ 15,916 $ 9,482 $ 2,491 $ 129,791 Collectively evaluated for impairment 10,992,571 8,803,930 1,982,362 623,794 5,194,098 1,748,611 371,537 29,716,903 Acquired with deteriorated credit quality (1) 2,794 218,491 44,058 43 106,881 11,418 — 383,685 Total (1) $ 11,059,019 $ 9,054,567 $ 2,032,522 $ 623,837 $ 5,316,895 $ 1,769,511 $ 374,028 $ 30,230,379 ($ in thousands) December 31, 2017 Commercial Lending Consumer Lending C&I CRE Multifamily Residential Construction and Land Single- Family Residential HELOCs Other Consumer Total Allowance for loan losses Individually evaluated for impairment $ 16,094 $ 684 $ 88 $ — $ 534 $ 4 $ 2,491 $ 19,895 Collectively evaluated for impairment 146,964 40,495 19,021 26,881 25,828 7,350 636 267,175 Acquired with deteriorated credit quality — 58 — — — — — 58 Total $ 163,058 $ 41,237 $ 19,109 $ 26,881 $ 26,362 $ 7,354 $ 3,127 $ 287,128 Recorded investment in loans Individually evaluated for impairment $ 98,685 $ 35,556 $ 10,636 $ 3,973 $ 14,338 $ 5,208 $ 2,491 $ 170,887 Collectively evaluated for impairment 10,586,751 8,623,653 1,844,492 655,353 4,514,573 1,763,709 334,013 28,322,544 Acquired with deteriorated credit quality (1) 11,795 277,688 61,048 371 117,378 14,007 — 482,287 Total (1) $ 10,697,231 $ 8,936,897 $ 1,916,176 $ 659,697 $ 4,646,289 $ 1,782,924 $ 336,504 $ 28,975,718 (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 flows expectation. The cash flows expected over the life of the pools are estimated by an internal cash flows 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. Prepayment speeds 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 collected at acquisition, considering the impact of prepayments, is referred to as the “nonaccretable difference.” The following table presents the changes in accretable yield for PCI loans for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Accretable yield for PCI loans, beginning of period $ 95,864 $ 127,990 $ 101,977 $ 136,247 Accretion (11,084 ) (11,082 ) (20,218 ) (21,361 ) Changes in expected cash flows 272 1,717 3,293 3,739 Accretable yield for PCI loans, end of period $ 85,052 $ 118,625 $ 85,052 $ 118,625 Loans Held-for-Sale At the time of commitment to originate or purchase a loan, the loan is determined to be held-for-investment if it is the Company’s intent to hold the loan to maturity or for the “foreseeable future,” subject to periodic reviews under the Company’s evaluation processes, including asset/liability and credit risk management. When the Company subsequently changes its intent to hold certain loans, the loans are transferred from held-for-investment to held-for-sale at the lower of cost or fair value. As of June 30, 2018 , loans held-for-sale of $14.7 million consisted of C&I and single-family residential loans. In comparison, as of December 31, 2017 , loans held-for-sale of $85 thousand consisted of single-family residential loans. Loan Purchases, Sales and Transfers From time to time, the Company purchases and sells loans in the secondary market. Certain purchased loans are transferred from held-for-investment to held-for-sale, and write-downs to allowance for loan losses are recorded, when appropriate. The following tables present information on the loan purchases into the held-for-investment portfolio, transfers from held-for-investment to held-for-sale, and sales during the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, 2018 Commercial Lending Consumer Lending C&I CRE Multifamily Construction Single-Family Other Total Loans transferred from held-for-investment to held-for-sale $ 99,449 $ 30,415 $ — $ — $ — $ — $ 129,864 (1) Sales $ 140,326 $ 30,415 $ — $ — $ 8,175 $ — $ 178,916 (2)(3)(4) Purchases $ 285,615 $ — $ 3,249 $ — $ 20,912 $ — $ 309,776 (5) ($ in thousands) Three Months Ended June 30, 2017 Commercial Lending Consumer Lending C&I CRE Multifamily Construction Single-Family Other Total Loans transferred from held-for-investment to held-for-sale $ 58,817 $ 5,668 $ 532 $ 687 $ 249 $ — $ 65,953 (1) Sales $ 76,441 $ 5,668 $ 532 $ 687 $ 5,432 $ — $ 88,760 (2)(3)(4) Purchases $ 220,612 $ — $ 714 $ — $ 128 $ — $ 221,454 (5) ($ in thousands) Six Months Ended June 30, 2018 Commercial Lending Consumer Lending C&I CRE Multifamily Construction Single-Family Other Total Loans transferred from held-for-investment to held-for-sale $ 245,840 $ 39,791 $ — $ — $ — $ — $ 285,631 (1) Sales $ 242,691 $ 39,791 $ — $ — $ 10,721 $ — $ 293,203 (2)(3)(4) Purchases $ 350,362 $ — $ 3,435 $ — $ 36,025 $ — $ 389,822 (5) ($ in thousands) Six Months Ended June 30, 2017 Commercial Lending Consumer Lending C&I CRE Multifamily Construction Single-Family Other Total Loans transferred from held-for-investment to held-for-sale $ 324,076 $ 18,433 $ 532 $ 687 $ 249 $ — $ 343,977 (1) Sales $ 313,120 $ 18,433 $ 532 $ 687 $ 9,742 $ 22,191 $ 364,705 (2)(3)(4) Purchases $ 367,728 $ — $ 840 $ — $ 128 $ — $ 368,696 (5) (1) The Company recorded $13.3 million and $13.4 million in write-downs to the allowance for loan losses related to loans transferred from held-for-investment to held-for-sale for the three and six months ended June 30, 2018 , respectively, and $117 thousand and $209 thousand for the three and six months ended June 30, 2017 , respectively. (2) Includes originated loans sold of $103.5 million and $193.2 million for the three and six months ended June 30, 2018 , respectively, and $ 38.3 million and $67.6 million for the three and six months ended June 30, 2017 , respectively. Originated loans sold during the three and six months ended June 30, 2018 and 2017 were primarily C&I and CRE loans. (3) Includes purchased loans sold in the secondary market of $75.4 million and $100.0 million for the three and six months ended June 30, 2018 , respectively, and $50.5 million and $297.1 million for the three and six months ended June 30, 2017 , respectively. (4) Net gains on sales of loans, excluding the lower of cost or fair value adjustments, were $2.3 million and $3.9 million for the three and six months ended June 30, 2018 , respectively, and $1.6 million and $4.4 million for the three and six months ended June 30, 2017 , respectively. No lower of cost or fair value adjustments were recorded for the three and six months ended June 30, 2018 . In comparison, the Company reversed the lower of cost or fair value adjustment of $8 thousand during the three months ended June 30, 2017 and recorded a lower of cost or fair value adjustment of $61 thousand for the six months ended June 30, 2017 . These adjustments were included in Net gains on sales of loans on the Consolidated Statement of Income. (5) C&I loan purchases for each of the three and six months ended June 30, 2018 and 2017 were mainly comprised of C&I syndicated loans.

Investments in Qualified Afford

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net	6 Months Ended
	Jun. 30, 2018
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	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 low or moderate income neighborhoods. The Company invests in certain affordable housing limited partnerships that qualify for CRA and tax 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 also 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 in Income tax expense on the Consolidated Statement of Income. The following table presents the Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 Investments in qualified affordable housing partnerships, net $ 152,556 $ 162,824 Accrued expenses and other liabilities — Unfunded commitments $ 52,110 $ 55,815 The following table presents additional information related to the Company’s investments in qualified affordable housing partnerships, net, for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended Six Months Ended 2018 2017 2018 2017 Tax credits and other tax benefits recognized $ 8,940 $ 9,566 $ 18,095 $ 19,187 Amortization expense included in income tax expense $ 6,700 $ 7,051 $ 13,773 $ 14,001 Investments in Tax Credit and Other Investments, Net The following table presents the Company’s investments in tax credit and other investments, net, and related unfunded commitments as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 Investments in tax credit and other investments, net $ 242,595 $ 224,551 Accrued expenses and other liabilities — Unfunded commitments $ 109,432 $ 113,372 The following table presents additional information related to the Company’s investments in tax credit and other investments, net, for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended Six Months Ended 2018 2017 2018 2017 Amortization expense included in noninterest expense $ 20,481 $ 27,872 $ 37,881 $ 42,232 As a result of the adoption of ASU 2016-01 in the first quarter of 2018, $30.9 million of equity securities with readily determinable fair values were included in Investments in tax credit and other investments, net , on the Consolidated Balance Sheet as of June 30, 2018 . These equity securities are CRA investments and were measured at fair value with changes in fair value recorded through net income. The unrealized losses recognized during the three and six months ended June 30, 2018 on these equity securities totaled $ 159 thousand and $613 thousand , respectively. The Company is not the primary beneficiary of the investments in tax credit and other investments and, therefore, is not required to consolidate these investments on the Consolidated Financial Statements. Depending on the ownership percentage and the influence the Company has on the investments, the Company applies the equity or cost method of accounting, or the measurement alternative as elected under ASU 2016-01 for equity investments without readily determinable fair value.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill Total goodwill was $465.5 million and $469.4 million as of June 30, 2018 and December 31, 2017 , respectively. The $3.9 million decrease in goodwill was due to the sale of the Bank’s DCB branches in March 2018, for which the associated allocated goodwill was written off. Goodwill is tested for impairment on an annual basis as of December 31, 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 16 — Business Segments to the Consolidated Financial Statements. Impairment Analysis The Company performed its annual impairment analysis as of December 31, 2017 , and concluded that there was no goodwill impairment as the fair value of all reporting units exceeded their respective carrying value. There were no triggering events during the three and six months ended June 30, 2018 , 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 2017 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 and are included in Other assets on the Consolidated Balance Sheet. These intangibles are tested for impairment on an annual basis, or more frequently as events occur or current circumstances and conditions warrant. Core deposit intangibles associated with the sale of the Bank’s DCB branches with a net carrying value of $1.0 million were written off in the first quarter of 2018. There were no impairment write-downs on the remaining core deposit intangibles for each of the three and six months ended June 30, 2018 and 2017 . The following table presents the gross carrying value of core deposit intangible assets and accumulated amortization as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 Gross balance (1) $ 86,099 $ 100,166 Accumulated amortization (1) (68,935 ) (79,112 ) Net carrying balance (1) $ 17,164 $ 21,054 (1) Excludes fully amortized core deposit intangible assets. 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 core deposit intangible assets was $1.4 million and $1.8 million for the three months ended June 30, 2018 and 2017 , respectively, and $2.9 million and $3.6 million for the six months ended June 30, 2018 and 2017 , respectively. The following table presents the estimated future amortization expense of core deposit intangibles as of June 30, 2018 : Year Ended December 31, Amount ($ in thousands) Remainder of 2018 $ 2,635 2019 4,518 2020 3,634 2021 2,749 2022 1,865 Thereafter 1,763 Total $ 17,164

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	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 June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 Loan commitments $ 5,122,314 $ 5,075,480 Commercial letters of credit and SBLCs $ 1,702,514 $ 1,655,897 Loan commitments are agreements to lend to customers provided that there are no violations of any conditions 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 are generally 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 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 the customers fail to pay, the Company would, as applicable, liquidate the collateral and/or offset accounts. As of June 30, 2018 , total letters of credit of $1.70 billion were comprised of SBLCs of $1.63 billion and commercial letters of credit of $71.4 million . The Company applies 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 $13.9 million as of June 30, 2018 and $12.7 million as of December 31, 2017 . These amounts are included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. Guarantees — The Company sells or securitizes 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 repurchase up to the recourse component of the loans when the loans default. The total unpaid principal balance of single-family and multifamily residential loans sold or securitized with recourse amounted to $99.7 million and $113.7 million as of June 30, 2018 and December 31, 2017 , respectively. The maximum potential future payments up to the recourse component that the Company is obligated to repurchase amounted to $36.7 million and $38.7 million as of June 30, 2018 and December 31, 2017 , respectively. The Company’s recourse reserve related to these guarantees is included in the allowance for unfunded credit reserves and totaled $153 thousand and $214 thousand as of June 30, 2018 and December 31, 2017 , respectively. The allowance for unfunded credit reserves is included in Accrued expenses and other liabilities on the Consolidated Balance Sheet. 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 its business. In accordance with ASC 450, Contingencies, the Company accrues reserves for outstanding lawsuits, claims and proceedings when a loss contingency is probable and can be reasonably estimated. The Company estimates the amount of loss contingencies using current available information from legal proceedings, advice from legal counsel, and available insurance coverage. Due to the inherent subjectivity of the assessments and unpredictability of the outcomes of the legal proceedings, any amounts accrued or included in this aggregate amount may not represent the ultimate loss to the Company from the legal proceedings in question. Thus, the Company’s exposure and ultimate losses may be higher, and possibly significantly more than the amounts accrued. Other Commitments — The Company has commitments to invest in qualified affordable housing partnerships, tax credit and other investments as discussed in Note 9 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net to the Consolidated Financial Statements. As of June 30, 2018 and December 31, 2017 , these commitments were $161.5 million and $169.2 million , respectively, and are included in Accrued expenses and other liabilities on the Consolidated Balance Sheet.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers On January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers - Topic 606 and all subsequent ASUs that modified ASC 606, Revenue from Contracts with Customers . The Company adopted ASC 606 using the modified retrospective method applied to those contracts which were not completed as of January 1, 2018. The new standard did not materially impact the timing or measurement of the Company’s revenue recognition as it is consistent with the Company’s previously existing accounting for contracts within the scope of the new standard. There was no cumulative effect adjustment to retained earnings as a result of adopting this new standard. The following tables present revenue from contracts with customers within the scope of ASC 606 and other noninterest income, segregated by operating segments for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, 2018 Retail Commercial Other Total Noninterest income: Revenue from contracts with customers (1) : Branch fees: Deposit service charges and related fee income $ 5,738 $ 3,000 $ 248 $ 8,986 Card income 933 221 — 1,154 Wealth management fees 4,501 — — 4,501 Total revenue from contracts with customers $ 11,172 $ 3,221 $ 248 $ 14,641 Other sources of noninterest income (2) 3,413 27,523 2,691 33,627 Total noninterest income $ 14,585 $ 30,744 $ 2,939 $ 48,268 ($ in thousands) Three Months Ended June 30, 2017 Retail Commercial Other Total Noninterest income: Revenue from contracts with customers (1) : Branch fees: Deposit service charges and related fee income $ 6,157 $ 2,812 $ 121 $ 9,090 Card income 1,029 202 — 1,231 Wealth management fees 3,249 132 — 3,381 Total revenue from contracts with customers $ 10,435 $ 3,146 $ 121 $ 13,702 Other sources of noninterest income (2) 3,206 23,438 6,898 33,542 Total noninterest income $ 13,641 $ 26,584 $ 7,019 $ 47,244 ($ in thousands) Six Months Ended June 30, 2018 Retail Commercial Other Total Noninterest income: Revenue from contracts with customers (1) : Branch fees: Deposit service charges and related fee income $ 11,752 $ 6,014 $ 406 $ 18,172 Card income 2,003 395 — 2,398 Wealth management fees 7,297 157 — 7,454 Total revenue from contracts with customers $ 21,052 $ 6,566 $ 406 $ 28,024 Other sources of noninterest income (2) 37,981 51,616 5,091 94,688 Total noninterest income $ 59,033 $ 58,182 $ 5,497 $ 122,712 ($ in thousands) Six Months Ended June 30, 2017 Retail Commercial Other Total Noninterest income: Revenue from contracts with customers (1) : Branch fees: Deposit service charges and related fee income $ 11,994 $ 5,554 $ 226 $ 17,774 Card income 2,056 415 — 2,471 Wealth management fees 6,495 1,221 — 7,716 Total revenue from contracts with customers $ 20,545 $ 7,190 $ 226 $ 27,961 Other sources of noninterest income (2) 6,660 45,128 83,323 135,111 Total noninterest income $ 27,205 $ 52,318 $ 83,549 $ 163,072 (1) There were no adjustments to the Company’s financial statements recorded as a result of the adoption of ASC 606. For comparability, the Company has adjusted prior period amounts to conform to the current period’s presentation. (2) Primarily represents revenue from contracts with customers that are out of the scope of ASC 606. Generally, the Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered. The Company generally records contract liabilities, or deferred revenue, when payments from customers are received or due in advance of providing services. The Company records contract assets when services are provided to customers before payment is received or before payment is due. Since the Company receives payments for its services during the period or at the time services are provided, there are no contract asset or receivable balances as of June 30, 2018 and December 31, 2017 . The major revenue streams by fee type that are within the scope of ASC 606 presented in the above tables are described in additional detail below: Branch Fees — Deposit Service Charges and Related Fee Income The Company offers a range of deposit products to individuals and businesses, which includes savings, money market, checking and time deposit accounts. The deposit account services include ongoing account maintenance, as well as certain optional services such as automated teller machine usage, wire transfer services or check orders. In addition, treasury management and business account analysis services are offered to commercial deposit customers. The Company may charge a fixed monthly account maintenance fee if certain average balances are not maintained, therefore making the fee variable. In addition, each time a deposit customer selects an optional service, the Company may earn transactional fees, generally recognized by the Company at the point in time when the transaction occurs. For business analysis accounts, commercial deposit customers receive an earnings credit based on their account balance, which can be used to offset the cost of banking and treasury management services. Business analysis accounts that are assessed fees in excess of earnings credits received are typically charged at the end of each month, after all transactions are known and the credits are calculated. Branch Fees — Card Income Card income is comprised of merchant referral fees and interchange income. For merchant referral fees, the Company provides marketing and referral services to acquiring banks for merchant card processing services and earns variable referral fees based on transaction activities. The Company satisfies its performance obligation over time as the Company identifies, solicits, and refers business customers who are provided such services. The Company receives monthly fees net of consideration it pays to the acquiring bank performing the merchant card processing services. The Company recognizes revenue on a monthly basis when the uncertainty associated with the variable referral fees is resolved after the Company receives monthly statements from the acquiring bank. For interchange income, the Company, as a card issuer, has a stand ready performance obligation to authorize, clear, and settle card transactions. The Company earns, or pays, interchange fees, which are percentage-based on each transaction, and based on rates published by the corresponding payment network rates for transactions on their network. The Company measures its progress toward the satisfaction of its performance obligation over time, as services are rendered, and the Company provides continuous access to this service and settles transactions as its customer, the payment network, requires. Interchange income is presented net of direct costs paid to the customer and entities in their distribution chain, which are transaction-based expenses such as rewards program expenses and certain network costs. Revenue is recognized when the net profit is determined by the payment networks at the end of each day. Wealth Management Fees The Company employs financial consultants to provide investment planning services for customers including wealth management services, asset allocation strategies, portfolio analysis and monitoring, investment strategies, and risk management strategies. The fees the Company earns are variable and are generally received monthly. The Company recognizes revenue for the services performed at quarter-end based on actual transaction details received from the broker-dealer the Company engages. Practical Expedients and Exemptions The Company applies the practical expedient in ASC 606-10-50-14 and does not disclose the value of unsatisfied performance obligations as the Company’s contracts with customers generally have a term that is less than one year, are open-ended with a cancellation period that is less than one year, or allow the Company to recognize revenue in the amount to which the Company has the right to invoice. In addition, given the short-term nature of the contracts, the Company also applies the practical expedient in ASC 606-10-32-18 and does not adjust the consideration from customers for the effects of a significant financing component, if at contract inception the period between when the entity transfers the goods or services and when the customer pays for that good or service is one year or less.

Stock Compensation Plans

Stock Compensation Plans	6 Months Ended
	Jun. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock Compensation Plans	Stock Compensation Plans Pursuant to the Company’s 2016 Stock Incentive Plan, as amended, the Company may issue stock options, restricted stock awards (“RSAs”), restricted stock units (“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, stock appreciation rights, stock purchase warrants, or RSAs as of both June 30, 2018 and 2017 . 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 the RSUs are outstanding. 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 each 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 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 and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended Six Months Ended 2018 2017 2018 2017 Stock compensation costs $ 7,057 $ 4,964 $ 13,215 $ 10,115 Related net tax benefits for stock compensation plans $ 97 $ 49 $ 4,875 $ 4,463 The following table presents a summary of the activity for the Company’s time-based and performance-based RSUs for the six months ended June 30, 2018 based on the target amount of awards: Six Months Ended June 30, 2018 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 1,166,580 $ 42.00 424,299 $ 41.44 Granted 401,830 67.30 120,286 70.13 Vested (324,051 ) 40.10 (133,295 ) 41.15 Forfeited (58,396 ) 47.65 — — Outstanding, at end of period 1,185,963 $ 50.81 411,290 $ 49.93 As of June 30, 2018 , total unrecognized compensation costs related to time-based and performance-based RSUs amounted to $42.2 million and $22.8 million , respectively. These costs are expected to be recognized over a weighted-average period of 2.24 years and 2.16 years for time-based and performance-based RSUs, respectively.

Stockholders' Equity and Earnin

Stockholders' Equity and Earnings Per Share	6 Months Ended
	Jun. 30, 2018
Stockholders' Equity and Earnings Per Share [Abstract]
Stockholders' Equity and Earnings Per Share	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 had no t been exercised as of June 30, 2018 . Earnings Per Share — 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. The following table presents the EPS calculations for the three and six months ended June 30, 2018 and 2017 : ($ and shares in thousands, except per share data) Three Months Ended Six Months Ended 2018 2017 2018 2017 Basic Net income $ 172,349 $ 118,330 $ 359,381 $ 288,066 Basic weighted-average number of shares outstanding 144,899 144,485 144,782 144,368 Basic EPS $ 1.19 $ 0.82 $ 2.48 $ 2.00 Diluted Net income $ 172,349 $ 118,330 $ 359,381 $ 288,066 Basic weighted-average number of shares outstanding 144,899 144,485 144,782 144,368 Diluted potential common shares (1) 1,192 1,255 1,264 1,406 Diluted weighted-average number of shares outstanding 146,091 145,740 146,046 145,774 Diluted EPS $ 1.18 $ 0.81 $ 2.46 $ 1.98 (1) Includes dilutive shares from RSUs and warrants for the three and six months ended June 30, 2018 and 2017 . For the three and six months ended June 30, 2018 , 4,012 and 3,807 weighted-average anti-dilutive RSUs, respectively, were excluded from the diluted EPS computation. For the three and six months ended June 30, 2017 , 2,423 and 5,132 weighted-average anti-dilutive RSUs, respectively, were excluded from the diluted EPS computation.

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) The following tables present the changes in the components of AOCI balances for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, 2018 2017 Available- Foreign (1) Total Available- Foreign (1) Total Beginning balance $ (55,981 ) $ 177 $ (55,804 ) $ (25,151 ) $ (18,367 ) $ (43,518 ) Net unrealized (losses) gains arising during the period (8,693 ) (6,822 ) (15,515 ) 7,777 3,136 10,913 Amounts reclassified from AOCI (148 ) — (148 ) (1,576 ) — (1,576 ) Changes, net of taxes (8,841 ) (6,822 ) (15,663 ) 6,201 3,136 9,337 Ending balance $ (64,822 ) $ (6,645 ) $ (71,467 ) $ (18,950 ) $ (15,231 ) $ (34,181 ) ($ in thousands) Six Months Ended June 30, 2018 2017 Available- Foreign (1) Total Available- Foreign (1) Total Beginning balance $ (30,898 ) $ (6,621 ) $ (37,519 ) $ (28,772 ) $ (19,374 ) $ (48,146 ) Cumulative effect of change in accounting principle related to marketable equity securities (2) 385 — 385 — — — Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate (3) (6,656 ) — (6,656 ) — — — Beginning balance, adjusted (37,169 ) (6,621 ) (43,790 ) (28,772 ) (19,374 ) (48,146 ) Net unrealized (losses) gains arising during the period (26,004 ) (24 ) (26,028 ) 12,832 4,143 16,975 Amounts reclassified from AOCI (1,649 ) — (1,649 ) (3,010 ) — (3,010 ) Changes, net of taxes (27,653 ) (24 ) (27,677 ) 9,822 4,143 13,965 Ending balance $ (64,822 ) $ (6,645 ) $ (71,467 ) $ (18,950 ) $ (15,231 ) $ (34,181 ) (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. (2) Represents the impact of the adoption in the first quarter of 2018 of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information. (3) Represents amounts reclassified from AOCI to retained earnings due to early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information. The following tables present the components of other comprehensive income (loss), reclassifications to net income and the related tax effects for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, 2018 2017 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax Available-for-sale investment securities: Net unrealized (losses) gains arising during the period $ (12,342 ) $ 3,649 $ (8,693 ) $ 13,420 $ (5,643 ) $ 7,777 Net realized gains reclassified into net income (1) (210 ) 62 (148 ) (2,720 ) 1,144 (1,576 ) Net change (12,552 ) 3,711 (8,841 ) 10,700 (4,499 ) 6,201 Foreign currency translation adjustments: Net unrealized (losses) gains arising during the period (6,822 ) — (6,822 ) 3,136 — 3,136 Net change (6,822 ) — (6,822 ) 3,136 — 3,136 Other comprehensive (loss) income $ (19,374 ) $ 3,711 $ (15,663 ) $ 13,836 $ (4,499 ) $ 9,337 ($ in thousands) Six Months Ended June 30, 2018 2017 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax Available-for-sale investment securities: Net unrealized (losses) gains arising during the period $ (36,919 ) $ 10,915 $ (26,004 ) $ 22,141 $ (9,309 ) $ 12,832 Net realized gains reclassified into net income (1) (2,339 ) 690 (1,649 ) (5,194 ) 2,184 (3,010 ) Net change (39,258 ) 11,605 (27,653 ) 16,947 (7,125 ) 9,822 Foreign currency translation adjustments: Net unrealized (losses) gains arising during the period (24 ) — (24 ) 4,143 — 4,143 Net change (24 ) — (24 ) 4,143 — 4,143 Other comprehensive (loss) income $ (39,282 ) $ 11,605 $ (27,677 ) $ 21,090 $ (7,125 ) $ 13,965 (1) For the three and six months ended June 30, 2018 and 2017 , pre-tax amounts were reported in Net gains on sales of available-for-sale investment securities on the Consolidated Statement of Income.

Business Segments

Business Segments	6 Months Ended
	Jun. 30, 2018
Segment Reporting [Abstract]
Business Segments	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 segments 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 segments and assess its performance; and discrete financial information is available. The Retail Banking segment focuses primarily on deposit operations through the Bank’s branch network. The Commercial Banking segment primarily generates commercial loans and deposits through domestic commercial lending offices located in the U.S. and foreign commercial lending offices in China and Hong Kong. Furthermore, the Commercial Banking segment offers a wide variety of international finance, trade finance, and cash management services and products. The remaining centralized functions, including treasury activities of the Company 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 allocated 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 directly attributable to a segment is assigned to the related business segment. Indirect costs, including technology-related costs and corporate overhead, are allocated based on that segment’s estimated usage using factors, including but not limited to, full-time equivalent employees, net interest margin, and loan and deposit volume. The provision for credit losses is based on charge-offs for the period as well as an allocation of the remaining consolidated provision expense based on the average loan balances for each segment during the period. The Company’s internal funds transfer pricing process is formulated with the goal of encouraging loan and deposit growth that is consistent with the Company’s overall profitability objectives, as well as to provide a reasonable and consistent basis for the measurement of its business segments’ net interest margins and profitability. The Company’s internal funds transfer pricing assumptions and methodologies are reviewed at least annually to ensure that the process is reflective of current market conditions. The Company’s internal reporting process utilizes a full-allocation methodology. Under this methodology, corporate expenses and expenses incurred by the Other segment are allocated to the Retail Banking and Commercial Banking segments, except certain treasury-related expenses and an insignificant amount of other residual unallocated expenses. In reporting segment income after taxes prior to the fourth quarter of 2017, the Company applied the consolidated effective tax rate to all of its business segments, and allocated the amortization of tax credit and other investments, along with the tax benefit, from the Other segment to the Retail Banking and Commercial Banking segments. In the fourth quarter of 2017, the Company changed its methodology to measure the after-tax income of the Retail Banking and Commercial Banking segments using the applicable statutory tax rates, with the Other segment receiving the residual tax expense or benefit to arrive at the consolidated effective tax rate. With this change, the amortization of tax credit and other investments, as well as with the tax benefit, which had previously been allocated to each segment, are now only allocated to the Other segment. The Company has also allocated indirect costs to noninterest expense by segment for management reporting. In addition, operating segment income, which had previously been presented on a before-tax basis only, has been revised to be presented on both a before and an after-tax basis. Changes in the Company’s management structure and allocation or reporting methodologies may result in changes in the measurement of operating segment results. For comparability, results for prior year periods are generally reclassified for such changes, 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 and six months ended June 30, 2018 and 2017 : ($ in thousands) Retail Banking Commercial Banking Other Total Three Months Ended June 30, 2018 Interest income $ 110,808 $ 261,567 $ 27,936 $ 400,311 Charge for funds used (56,915 ) (126,782 ) (16,674 ) (200,371 ) Interest spread on funds used 53,893 134,785 11,262 199,940 Interest expense (31,991 ) (11,635 ) (15,006 ) (58,632 ) Credit on funds provided 158,446 30,728 11,197 200,371 Interest spread on funds provided (used) 126,455 19,093 (3,809 ) 141,739 Net interest income before provision for credit losses $ 180,348 $ 153,878 $ 7,453 $ 341,679 Provision for credit losses $ 3,414 $ 12,122 $ — $ 15,536 Noninterest income $ 14,585 $ 30,744 $ 2,939 $ 48,268 Noninterest expense $ 86,144 $ 56,706 $ 34,569 $ 177,419 Segment income (loss) before income taxes $ 105,375 $ 115,794 $ (24,177 ) $ 196,992 Segment income after income taxes $ 75,496 $ 83,210 $ 13,643 $ 172,349 As of June 30, 2018: Segment assets $ 9,816,103 $ 22,199,992 $ 6,056,859 $ 38,072,954 ($ in thousands) Retail Commercial Other Total Three Months Ended June 30, 2017 Interest income $ 88,752 $ 205,873 $ 28,150 $ 322,775 Charge for funds used (33,139 ) (77,750 ) (14,517 ) (125,406 ) Interest spread on funds used 55,613 128,123 13,633 197,369 Interest expense (18,377 ) (5,184 ) (9,123 ) (32,684 ) Credit on funds provided 106,094 12,623 6,689 125,406 Interest spread on funds provided (used) 87,717 7,439 (2,434 ) 92,722 Net interest income before (reversal of) provision for credit losses $ 143,330 $ 135,562 $ 11,199 $ 290,091 (Reversal of) provision for credit losses $ (664 ) $ 11,349 $ — $ 10,685 Noninterest income $ 13,641 $ 26,584 $ 7,019 $ 47,244 Noninterest expense $ 79,950 $ 44,551 $ 44,464 $ 168,965 Segment income (loss) before income taxes $ 77,685 $ 106,246 $ (26,246 ) $ 157,685 Segment income after income taxes $ 45,679 $ 62,766 $ 9,885 $ 118,330 As of June 30, 2017: Segment assets $ 8,438,706 $ 20,456,579 $ 7,022,332 $ 35,917,617 ($ in thousands) Retail Commercial Other Total Six Months Ended June 30, 2018 Interest income $ 215,518 $ 501,144 $ 55,522 $ 772,184 Charge for funds used (106,188 ) (238,148 ) (35,001 ) (379,337 ) Interest spread on funds used 109,330 262,996 20,521 392,847 Interest expense (56,931 ) (20,814 ) (26,067 ) (103,812 ) Credit on funds provided 303,897 56,176 19,264 379,337 Interest spread on funds provided (used) 246,966 35,362 (6,803 ) 275,525 Net interest income before provision for credit losses $ 356,296 $ 298,358 $ 13,718 $ 668,372 Provision for credit losses $ 6,507 $ 29,247 $ — $ 35,754 Noninterest income $ 59,033 $ 58,182 $ 5,497 $ 122,712 Noninterest expense $ 168,112 $ 121,726 $ 56,716 $ 346,554 Segment income (loss) before income taxes $ 240,710 $ 205,567 $ (37,501 ) $ 408,776 Segment income after income taxes $ 172,464 $ 147,572 $ 39,345 $ 359,381 As of June 30, 2018: Segment assets $ 9,816,103 $ 22,199,992 $ 6,056,859 $ 38,072,954 ($ in thousands) Retail Commercial Other Total Six Months Ended June 30, 2017 Interest income $ 169,777 $ 398,292 $ 57,375 $ 625,444 Charge for funds used (60,877 ) (142,259 ) (42,684 ) (245,820 ) Interest spread on funds used 108,900 256,033 14,691 379,624 Interest expense (34,560 ) (10,282 ) (18,389 ) (63,231 ) Credit on funds provided 208,640 24,666 12,514 245,820 Interest spread on funds provided (used) 174,080 14,384 (5,875 ) 182,589 Net interest income before (reversal of) provision for credit losses $ 282,980 $ 270,417 $ 8,816 $ 562,213 (Reversal of) provision for credit losses $ (286 ) $ 18,039 $ — $ 17,753 Noninterest income $ 27,205 $ 52,318 $ 83,549 $ 163,072 Noninterest expense $ 152,794 $ 98,924 $ 70,125 $ 321,843 Segment income before income taxes $ 157,677 $ 205,772 $ 22,240 $ 385,689 Segment income after income taxes $ 92,714 $ 121,562 $ 73,790 $ 288,066 As of June 30, 2017: Segment assets $ 8,438,706 $ 20,456,579 $ 7,022,332 $ 35,917,617

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On July 19, 2018 , the Company’s Board of Directors declared third quarter 2018 cash dividends on the Company’s common stock. The common stock cash dividend of $0.23 per share is payable on August 15, 2018 to stockholders of record as of August 1, 2018 .

Basis of Presentation (Policies

Basis of Presentation (Policies)	6 Months Ended
	Jun. 30, 2018
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 and East West’s subsidiaries. Intercompany transactions and accounts have been eliminated in consolidation. As of June 30, 2018 , East West also has six wholly-owned subsidiaries that are statutory business trusts (the “Trusts”). In accordance with Financial Accounting Standards Board (“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 are 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. They reflect all adjustments that, in the opinion of management, are necessary for fair statement of the interim period Consolidated Financial Statements. Certain items on the Consolidated Financial Statements and notes for the prior periods have been reclassified to conform to the current period presentation.
New Accounting Pronouncements Adopted and Recent Accounting Pronouncements	New Accounting Pronouncements Adopted In May 2014, the FASB issued ASU 2014-09, Revenue from Contracts with Customers (Topic 606), which clarifies the principles for recognizing revenue for contracts to provide goods or services to customers. The guidance also requires new quantitative and qualitative disclosures including the disaggregation of revenues and descriptions of performance obligations. The Company’s revenue is comprised of net interest income and noninterest income. The scope of this new guidance explicitly excludes net interest income, as well as other revenues from financial instruments including loans, leases, securities and derivatives. Accordingly, the majority of the Company’s revenues are not affected. In addition, the new guidance does not materially impact the timing or measurement of the Company’s revenue recognition as it is consistent with the Company’s previously existing accounting for contracts within the scope of the new standard. The Company adopted this guidance as of January 1, 2018 using the modified retrospective method where there was no cumulative effect adjustment to retained earnings as a result of adopting this new guidance. Overall, the guidance did not have a material impact on the Company’s consolidated financial statements. The Company has provided a disaggregation of the significant categories of revenues within the scope of this guidance and expanded the qualitative disclosures of the Company’s noninterest income. See Note 12 — Revenue from Contracts with Customers for additional information. In January 2016, the FASB issued ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. With the exception of the amendments related to equity investments without readily determinable fair values and the use of exit price to measure the fair value of financial instruments for disclosure purposes that were adopted prospectively, the Company adopted all other amendments of the standard effective January 1, 2018 on a modified retrospective basis. The guidance requires investments in marketable equity securities to be accounted for at fair value with unrealized gains or losses reflected in earnings. As of the date of adoption, the Company reclassified approximately $31.9 million of marketable equity securities that were previously classified as Available-for-sale investment securities, at fair value to Investments in tax credits and other investments, net. In addition, the Company recorded a cumulative-effect adjustment as of January 1, 2018 that reduced retained earnings by $545 thousand and increased AOCI by $385 thousand . The guidance also provides a measurement alternative for equity securities without readily determinable fair values to be measured at cost less impairment (if any), plus or minus observable price changes from an identical or similar investment of the same issuer. Such price changes (if any) are reflected in earnings beginning in the period of adoption. As of January 1, 2018, the Company elected the measurement alternative for its privately held cost method investments, which was not a material amount. The Company’s investments in the Federal Reserve Bank of San Francisco (“FRB”) and FHLB stock are not subject to this guidance and continue to be accounted for at cost. In addition, the guidance eliminates the requirement to disclose methods and significant assumptions used to estimate the fair value of financial instruments measured at amortized cost on the Consolidated Balance Sheet. Furthermore, for purposes of disclosing the fair value of financial instruments carried at amortized cost, the Company has updated its valuation methods as necessary to conform to an exit price concept as required by the guidance as of January 1, 2018. In August 2016, the FASB issued ASU 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments , to provide guidance on eight specific issues related to classification on the Consolidated Statement of Cash Flows. The specific issues cover cash payments for debt prepayment or debt extinguishment costs; cash outflows for settlement of zero-coupon debt instruments or other debt instruments with coupon interest rates that are insignificant in relation to the effective interest rate of the borrowings; contingent consideration payments that are not made soon after a business combination; proceeds from the settlement of insurance claims; proceeds from the settlement of corporate-owned life insurance policies, including bank-owned life insurance policies; distributions received from equity method investees; and beneficial interests received in securitization transactions. The guidance also clarifies that in instances of cash flows with multiple aspects that cannot be separately identified, the classification should be based on the activity that is likely to be the predominant source or use of the cash flows. The Company adopted this guidance in the first quarter of 2018 on a retrospective basis. The adoption of this guidance did not have a material impact on the Company’s 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 those amounts that are deemed to be restricted cash and restricted cash equivalents in its cash and cash equivalents balances on the Consolidated Statement of Cash Flows. In addition, the Company is required to explain the changes in the combined total of restricted and unrestricted balances on the Consolidated Statement of Cash Flows. The Company adopted this guidance in the first quarter of 2018 on a retrospective basis. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business, which narrows the definition of a business by adding an initial screen to determine if substantially all of the fair value of the gross assets acquired is concentrated in a single asset or group of similar assets (a “set”). If the screen is met, the set is not a business. ASU 2017-01 also specifies the minimum inputs and processes required for a set to be considered a business, and it removes the requirement to evaluate a market participant’s ability to replace missing elements when all of the inputs or processes that the seller used in operating a business were not obtained. The Company adopted this guidance in the first quarter of 2018 prospectively. The adoption of this guidance did not have an impact on the Company’s 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. The guidance does not require any accounting changes 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 on January 1, 2019, with early adoption permitted. The guidance should be applied using a modified retrospective transition method, with the cumulative-effect adjustment recognized to retained earnings as of the beginning of the period of adoption. The Company early adopted this guidance in the first quarter of 2018. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In May 2017, the FASB issued ASU 2017-09, Compensation — Stock Compensation (Topic 718): Scope of Modification Accounting , which amends the scope of modification accounting for share-based payment arrangements. Specifically, an entity would not apply modification accounting if the fair value, vesting conditions and classification of the awards are the same immediately before and after the modification. The Company adopted the guidance in the first quarter of 2018 prospectively. The adoption of this guidance did not have an impact on the Company’s Consolidated Financial Statements. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities, which better aligns the Company’s risk management activities and financial reporting for hedging relationships through changes to both the description and measurement guidance for qualifying hedging relationships. The guidance also changes the presentation of hedge results, expands and refines hedge accounting for both nonfinancial and financial risk components, and aligns the recognition and presentation of the effects of the hedging instrument and the hedged item on the Consolidated Financial Statements. ASU 2017-12 is effective on January 1, 2019, with early adoption permitted. The guidance should be applied using a modified retrospective transition method. The Company early adopted this guidance in the first quarter of 2018, and the adoption of this guidance did not have a material impact on the Company’s Consolidated Financial Statements. In February 2018, the FASB issued ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was signed into law. Under current U.S. GAAP, deferred tax assets and liabilities are to be adjusted for the effect of a change in tax laws or rates in net income of the reporting period that includes the enactment date. This accounting treatment resulted in the tax effect of items within AOCI not reflecting the appropriate tax rate. This guidance permits companies to reclassify the stranded tax effects resulting from the Tax Act from AOCI to retained earnings. The guidance is effective on January 1, 2019, with early adoption permitted. The Company early adopted this guidance in the first quarter of 2018 retrospectively. The Company has identified the unrealized losses for available-for-sale securities to be the only item in AOCI with stranded tax effects, and made a policy election to reclassify the related stranded tax effects using the “investment-by-investment” approach. The adoption of the guidance resulted in a cumulative-effect adjustment as of January 1, 2018 that increased retained earnings by $6.7 million and reduced AOCI by the same amount. Recent Accounting Pronouncements 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. The guidance requires lessees to recognize right-of-use assets and related lease liabilities for all leases with lease terms of more than 12 months on the Consolidated Balance Sheet, and provide quantitative and qualitative disclosures regarding key information about the 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 on January 1, 2019, with early adoption permitted. The guidance should be applied using a modified retrospective transition method through a cumulative-effect adjustment. The Company has completed its review of its existing lease contracts and service contracts that may include embedded leases and is in the process of implementing a new system to address this guidance. The Company expects the adoption of this guidance to result in additional assets and liabilities, as the Company will be required to recognize operating leases on its Consolidated Balance Sheet. The Company does not expect a material impact to its recognition of operating lease expense on its Consolidated Statement of Income and is in the process of evaluating the impacts of adopting the new guidance on its disclosures. In June 2016, the FASB issued ASU 2016-13, Financial Instruments — Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The new current expected credit loss (“CECL”) impairment model applies to most financial assets measured at amortized cost and certain other instruments, including trade and other receivables, loan receivables, available-for-sale and held-to-maturity debt securities, net investments in leases and off-balance sheet credit exposures. The CECL model utilizes a lifetime “expected credit loss” measurement objective for the recognition of credit losses at the time the financial asset is originated or acquired. The expected credit losses are adjusted in each period for changes in expected lifetime credit losses. ASU 2016-13 also expands the disclosure requirements regarding an entity’s assumptions, models and methods for estimating the allowance for loan 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 on January 1, 2020, with early adoption permitted on January 1, 2019. The guidance should be applied using a modified retrospective approach through a cumulative-effect adjustment to retained earnings as of the beginning of the reporting period of adoption. 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 debt securities. The Company’s implementation efforts include, but are not limited to, identifying key interpretive issues, assessing its processes, identifying the system requirements against the new guidance to determine what modifications may be required, evaluating modeling methodologies for its portfolio segments and assessing potential macroeconomic factors that will be used to determine the reasonable and supportable forecast period. 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. Under this guidance, an entity will no longer perform a hypothetical purchase price allocation to measure goodwill impairment. Instead, an impairment loss will be recognized when the carrying amount of a reporting unit exceeds its fair value. The guidance also eliminates the requirement to perform a qualitative assessment for any reporting units with a zero or negative carrying amount. ASU 2017-04 is effective on January 1, 2020 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 does not expect the adoption of this guidance to have a material impact on the Company’s Consolidated Financial Statements.
Held-For-Sale Classification	The Company reports a business as held-for-sale when management has approved or received approval to sell the business and is committed to a formal plan, the business is available for immediate sale, the business is being actively marketed, the sale is anticipated to occur during the next 12 months and certain other specific criteria are met. A business classified as held-for-sale is recorded at the lower of its carrying amount or estimated fair value less costs to sell. If the carrying amount of the business exceeds its estimated fair value, a loss is recognized. Depreciation and amortization expense are not recorded with respect to the assets of a business after it is classified as held-for-sale.
Credit Quality Indicators	All loans are subject to the Company’s internal and external credit review and monitoring. For the commercial lending portfolio, 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 the majority of the consumer lending portfolio, 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 classifies loans 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 loans that have sufficient sources of repayment in order to repay the loan in full in accordance with all terms and conditions. Special Mention loans are loans that have potential weaknesses that warrant closer attention by management. Special Mention is 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 loans that have well-defined weaknesses that may jeopardize the full and timely repayment of the loan. Substandard loans have a distinct possibility of loss, if the deficiencies are not corrected. When management has assessed a potential for loss but a distinct possibility of loss is not recognizable, the loan remains classified as Substandard grade. Doubtful loans have insufficient sources of repayment and a high probability of loss. Loss loans are loans that are 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.
Loans held-for-sale	At the time of commitment to originate or purchase a loan, the loan is determined to be held-for-investment if it is the Company’s intent to hold the loan to maturity or for the “foreseeable future,” subject to periodic reviews under the Company’s evaluation processes, including asset/liability and credit risk management. When the Company subsequently changes its intent to hold certain loans, the loans are transferred from held-for-investment to held-for-sale at the lower of cost or fair value.
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 in Income tax expense on the Consolidated Statement of Income.
Goodwill and Core Deposit Intangibles	Goodwill is tested for impairment on an annual basis as of December 31, 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. Core deposit intangibles represent the intangible value of depositor relationships resulting from deposit liabilities assumed in various acquisitions and are included in Other assets on the Consolidated Balance Sheet. These intangibles are tested for impairment on an annual basis, or more frequently as events occur or current circumstances and conditions warrant.
Amortization Expense of Core Deposit Intangibles	The Company amortizes the core deposit intangibles based on the projected useful lives of the related deposits.
Revenue Recognition	Generally, the Company recognizes revenue from contracts with customers when it satisfies its performance obligations. The Company’s performance obligations are typically satisfied as services are rendered. The Company generally records contract liabilities, or deferred revenue, when payments from customers are received or due in advance of providing services. The Company records contract assets when services are provided to customers before payment is received or before payment is due.
Earnings Per Share	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 Fa26

Fair Value Measurement and Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
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 June 30, 2018 and December 31, 2017 : ($ in thousands) Assets (Liabilities) Measured at Fair Value on a Recurring Basis 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 $ 629,270 $ 629,270 $ — $ — U.S. government agency and U.S. government sponsored enterprise debt securities 240,042 — 240,042 — U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 337,237 — 337,237 — Residential mortgage-backed securities 936,447 — 936,447 — Municipal securities 73,619 — 73,619 — Non-agency residential mortgage-backed securities: Investment grade 7,835 — 7,835 — Corporate debt securities: Investment grade 11,001 — 11,001 — Foreign bonds: Investment grade 459,433 — 459,433 — Asset-backed securities: Investment grade 12,560 — 12,560 — Total available-for-sale investment securities $ 2,707,444 $ 629,270 $ 2,078,174 $ — Investments in tax credit and other investments: Equity securities with readily determinable fair value (1) $ 30,929 $ 20,431 $ 10,498 $ — Total investments in tax credit and other investments $ 30,929 $ 20,431 $ 10,498 $ — Derivative assets: Interest rate swaps and options $ 64,225 $ — $ 64,225 $ — Foreign exchange forwards, spot and swaps 11,724 — 11,724 — RPAs 1 — 1 — Equity warrants 1,878 — 1,230 648 Commodity swaps and options 3,628 — 3,628 — Total derivative assets $ 81,456 $ — $ 80,808 $ 648 Derivative liabilities: Interest rate swaps and options $ 100,025 $ — $ 100,025 $ — Foreign exchange forwards, spot and swaps 11,281 — 11,281 — RPAs 77 — 77 — Commodity swaps and options 3,159 — 3,159 — Total derivative liabilities $ 114,542 $ — $ 114,542 $ — (1) Equity securities with readily determinable fair value were comprised of mutual funds as of June 30, 2018 . ($ in thousands) Assets (Liabilities) Measured at Fair Value on a Recurring Basis Fair Value Measurements Quoted Prices in Significant Significant Unobservable Inputs (Level 3) Available-for-sale investment securities: U.S. Treasury securities $ 640,280 $ 640,280 $ — $ — U.S. government agency and U.S. government sponsored enterprise debt securities 203,392 — 203,392 — U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 318,957 — 318,957 — Residential mortgage-backed securities 1,190,271 — 1,190,271 — Municipal securities 99,982 — 99,982 — Non-agency residential mortgage-backed securities: Investment grade 9,117 — 9,117 — Corporate debt securities: Investment grade 37,003 — 37,003 — Foreign bonds: Investment grade 486,408 — 486,408 — Other securities 31,342 20,735 10,607 — Total available-for-sale investment securities $ 3,016,752 $ 661,015 $ 2,355,737 $ — Derivative assets: Interest rate swaps and options $ 58,633 $ — $ 58,633 $ — Foreign exchange forwards, spot and swaps 5,840 — 5,840 — RPAs 1 — 1 — Equity warrants 1,672 — 993 679 Total derivative assets $ 66,146 $ — $ 65,467 $ 679 Derivative liabilities: Interest rate swaps $ 6,799 $ — $ 6,799 $ — Interest rate swaps and options 57,958 — 57,958 — Foreign exchange forwards, spot and swaps 10,170 — 10,170 — RPAs 8 — 8 — Total derivative liabilities $ 74,935 $ — $ 74,935 $ —
Reconciliation of the beginning and ending balances for warrants measured at fair value on a recurring basis using significant unobservable inputs (Level 3)	The following table presents a reconciliation of the beginning and ending balances for these warrants for the three and six months ended June 30, 2018 : ($ in thousands) Three Months Ended Six Months Ended June 30, 2018 June 30, 2018 Equity warrants Beginning balance $ 931 $ 679 Total (losses) gains included in earnings (1) (76 ) 168 Issuances 26 34 Settlements (233 ) (233 ) Ending balance $ 648 $ 648 (1) Includes unrealized (losses) gains of $(13) thousand and $231 thousand for the three and six months ended June 30, 2018 , respectively. The realized/unrealized (losses) gains are included in Ancillary loan fees and other income on the Consolidated Statement of Income.
Schedule of assets with fair value changes measured on a nonrecurring basis	following tables present the carrying amounts of assets included on the Consolidated Balance Sheet that had fair value changes measured on a nonrecurring basis as of June 30, 2018 and December 31, 2017 : Assets Measured at Fair Value on a Nonrecurring Basis ($ in thousands) Fair Value Measurements Quoted Prices in Significant Significant Unobservable Inputs (Level 3) Non-PCI impaired loans: Commercial lending: Commercial and industrial (“C&I”) $ 18,574 $ — $ — $ 18,574 Commercial real estate (“CRE”) 3,053 — — 3,053 Consumer lending: Single-family residential 2,584 — — 2,584 Home equity lines of credit (“HELOCs”) 924 — — 924 Total non-PCI impaired loans $ 25,135 $ — $ — $ 25,135 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 lending: C&I $ 31,404 $ — $ — $ 31,404 CRE 2,667 — — 2,667 Construction and land 3,973 — — 3,973 Consumer lending: Single-family residential 144 — — 144 Total non-PCI impaired loans $ 38,188 $ — $ — $ 38,188 OREO $ 9 $ — $ — $ 9 T
Schedule of fair value adjustments of assets measured on a nonrecurring basis recognized	following table presents the total change in value of assets for which a fair value adjustment has been included on the Consolidated Statements of Income for the three and six months ended June 30, 2018 and 2017 and held as of those dates: ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Non-PCI impaired loans: Commercial lending: C&I $ 4,544 $ (14,060 ) $ 595 $ (11,418 ) CRE 66 193 (23 ) 118 Multifamily residential — (106 ) — (107 ) Construction and land — — — (147 ) Consumer lending: Single-family residential — 76 15 158 HELOCs (73 ) 24 (73 ) 25 Total non-PCI impaired loans nonrecurring fair value gains (losses) $ 4,537 $ (13,873 ) $ 514 $ (11,371 ) OREO nonrecurring fair value losses $ — $ — $ — $ (285 )
Schedule of the carrying and fair values per the fair value hierarchy of certain financial instruments	following tables present the fair value estimates for financial instruments as of June 30, 2018 and December 31, 2017 , excluding financial instruments recorded at fair value on a recurring basis as they are included in the tables presented elsewhere in Note 4 — Fair Value Measurement and Fair Value of Financial Instruments . The carrying amounts in the following tables are recorded on the Consolidated Balance Sheet under the indicated captions, except for accrued interest receivable and mortgage servicing rights that are included in Other assets, and accrued interest payable that is included in Accrued expenses and other liabilities. These financial assets and liabilities are measured at amortized cost basis on the Company’s Consolidated Balance Sheet. During the first quarter of 2018 , the Company adopted ASU 2016-01 and has updated its valuation methods as necessary to conform to an “exit price” concept as required by ASU 2016-01. ($ in thousands) June 30, 2018 Carrying Amount Level 1 Level 2 Level 3 Estimated Fair Value Financial assets: Cash and cash equivalents $ 2,297,471 $ 2,297,471 $ — $ — $ 2,297,471 Interest-bearing deposits with banks $ 360,900 $ — $ 360,900 $ — $ 360,900 Resale agreements (1) $ 975,000 $ — $ 946,643 $ — $ 946,643 Restricted equity securities, at cost $ 73,524 $ — $ 73,524 $ — $ 73,524 Loans held-for-sale $ 14,658 $ — $ 14,658 $ — $ 14,658 Loans held-for-investment, net $ 29,928,829 $ — $ — $ 30,073,212 $ 30,073,212 Mortgage servicing rights $ 7,865 $ — $ — $ 12,111 $ 12,111 Accrued interest receivable $ 128,339 $ — $ 128,339 $ — $ 128,339 Financial liabilities: Demand, checking, savings and money market deposits $ 24,916,109 $ — $ 24,916,109 $ — $ 24,916,109 Time deposits $ 7,860,023 $ — $ 7,835,585 $ — $ 7,835,585 Short-term borrowings $ 58,523 $ — $ 58,523 $ — $ 58,523 FHLB advances $ 325,020 $ — $ 337,544 $ — $ 337,544 Repurchase agreements (1) $ 50,000 $ — $ 114,944 $ — $ 114,944 Long-term debt $ 161,704 $ — $ 167,573 $ — $ 167,573 Accrued interest payable $ 15,360 $ — $ 15,360 $ — $ 15,360 (1) Resale and repurchase agreements are reported net pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements . As of June 30, 2018 , $400.0 million out of $450.0 million of repurchase agreements were eligible for netting against resale agreements. ($ in thousands) December 31, 2017 Carrying Level 1 Level 2 Level 3 Estimated Financial assets: Cash and cash equivalents $ 2,174,592 $ 2,174,592 $ — $ — $ 2,174,592 Interest-bearing deposits with banks $ 398,422 $ — $ 398,422 $ — $ 398,422 Resale agreements (1) $ 1,050,000 $ — $ 1,035,158 $ — $ 1,035,158 Restricted equity securities, at cost $ 73,521 $ — $ 73,521 $ — $ 73,521 Loans held-for-sale $ 85 $ — $ 85 $ — $ 85 Loans held-for-investment, net $ 28,688,590 $ — $ — $ 28,956,349 $ 28,956,349 Branch assets held-for-sale $ 91,318 $ 5,143 $ 10,970 $ 78,132 $ 94,245 Mortgage servicing rights $ 7,771 $ — $ — $ 11,324 $ 11,324 Accrued interest receivable $ 121,719 $ — $ 121,719 $ — $ 121,719 Financial liabilities: Demand, checking, savings and money market deposits $ 25,974,314 $ — $ 25,974,314 $ — $ 25,974,314 Time deposits $ 5,640,749 $ — $ 5,626,855 $ — $ 5,626,855 Branch liability held-for-sale $ 605,111 $ — $ — $ 643,937 $ 643,937 FHLB advances $ 323,891 $ — $ 335,901 $ — $ 335,901 Repurchase agreements (1) $ 50,000 $ — $ 104,830 $ — $ 104,830 Long-term debt $ 171,577 $ — $ 171,673 $ — $ 171,673 Accrued interest payable $ 10,724 $ — $ 10,724 $ — $ 10,724 (1) Resale and repurchase agreements are reported net pursuant to ASC 210-20-45-11, Balance Sheet Offsetting: Repurchase and Reverse Repurchase Agreements . As of December 31, 2017 , $400.0 million out of $450.0 million of repurchase agreements were eligible for netting against resale agreements.
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Schedule of quantitative information about significant unobservable inputs used in the valuation of assets classified as Level 3	he following table presents quantitative information about the significant unobservable inputs used in the valuation of assets measured on a recurring basis classified as Level 3 as of June 30, 2018 . The significant unobservable inputs presented in the table below are those that the Company considers significant to the fair value of the Level 3 assets. The Company considers unobservable inputs to be significant if, by their exclusion, the fair value of the Level 3 assets would be impacted by a predetermined percentage change. ($ in thousands) Fair Value Measurements (Level 3) Valuation Technique Unobservable Input(s) Weighted- Average Derivative assets: Equity warrants $ 648 Black-Scholes option pricing model Volatility 47% Liquidity discount 47% Ass
Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Schedule of quantitative information about significant unobservable inputs used in the valuation of assets classified as Level 3	he 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 June 30, 2018 and December 31, 2017 : ($ in thousands) Fair Value Valuation Unobservable Input(s) Range(s) of Input(s) Weighted- Average June 30, 2018 Non-PCI impaired loans $ 21,048 Discounted cash flows Discount 4% — 7% 6% $ 3,167 Fair value of property Selling cost 8% 8% $ 318 Fair value of collateral Discount 15% 15% $ 602 Fair value of collateral Contract value NM NM December 31, 2017 Non-PCI impaired loans $ 22,802 Discounted cash flows Discount 4% — 10% 6% $ 9,773 Fair value of property Selling cost 8% 8% $ 3,207 Fair value of collateral Discount 20% — 32% 29% $ 2,406 Fair value of collateral Contract value NM NM OREO $ 9 Fair value of property Selling cost 8% 8% NM — Not meaningful.

Securities Purchased under Re27

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Tables)	6 Months Ended
	Jun. 30, 2018
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 Sheet as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Financial Collateral Net Amount Resale agreements $ 1,375,000 $ (400,000 ) $ 975,000 $ — $ (966,410 ) (1) $ 8,590 Gross Amounts Gross Amounts Net Amounts of on the Gross Amounts Not Offset on the Liabilities Financial Collateral Net Amount Repurchase agreements $ 450,000 $ (400,000 ) $ 50,000 $ — $ (50,000 ) (2) $ — ($ in thousands) December 31, 2017 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Assets Financial Collateral Received Net Amount Resale agreements $ 1,450,000 $ (400,000 ) $ 1,050,000 $ — $ (1,045,696 ) (1) $ 4,304 Gross Amounts Gross Amounts Net Amounts of Gross Amounts Not Offset on the Liabilities Financial Collateral Net Amount Repurchase agreements $ 450,000 $ (400,000 ) $ 50,000 $ — $ (50,000 ) (2) $ — (1) 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. (2) 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)	6 Months Ended
	Jun. 30, 2018
Investments, Debt and Equity Securities [Abstract]
Schedule of amortized cost, gross unrealized gains, gross unrealized losses and fair value by major categories of available-for-sale investment securities	The following tables present the amortized cost, gross unrealized gains and losses, and fair value by major categories of available-for-sale investment securities carried at fair value, as of June 30, 2018 and December 31, 2017 : June 30, 2018 ($ in thousands) Amortized Gross Gross Fair Available-for-sale investment securities: U.S. Treasury securities $ 648,271 $ — $ (19,001 ) $ 629,270 U.S. government agency and U.S. government sponsored enterprise debt securities 244,688 49 (4,695 ) 240,042 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 352,547 10 (15,320 ) 337,237 Residential mortgage-backed securities 958,173 1,920 (23,646 ) 936,447 Municipal securities 74,596 206 (1,183 ) 73,619 Non-agency residential mortgage-backed securities: Investment grade (1) 8,004 — (169 ) 7,835 Corporate debt securities: Investment grade (1) 11,250 — (249 ) 11,001 Foreign bonds: Investment grade (1) (2) 489,340 — (29,907 ) 459,433 Asset-backed securities: Investment grade (1) 12,604 — (44 ) 12,560 Total available-for-sale investment securities $ 2,799,473 $ 2,185 $ (94,214 ) $ 2,707,444 December 31, 2017 ($ in thousands) Amortized Gross Gross Fair Available-for-sale investment securities: U.S. Treasury securities $ 651,395 $ — $ (11,115 ) $ 640,280 U.S. government agency and U.S. government sponsored enterprise debt securities 206,815 62 (3,485 ) 203,392 U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 328,348 141 (9,532 ) 318,957 Residential mortgage-backed securities 1,199,869 3,964 (13,562 ) 1,190,271 Municipal securities 99,636 655 (309 ) 99,982 Non-agency residential mortgage-backed securities: Investment grade (1) 9,136 3 (22 ) 9,117 Corporate debt securities: Investment grade (1) 37,585 164 (746 ) 37,003 Foreign bonds: Investment grade (1) (2) 505,396 24 (19,012 ) 486,408 Other securities (3) 31,887 — (545 ) 31,342 Total available-for-sale investment securities $ 3,070,067 $ 5,013 $ (58,328 ) $ 3,016,752 (1) Available-for-sale investment securities rated BBB- or higher by Standard & Poor’s (“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 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 value of foreign bonds include $445.1 million and $456.1 million of multilateral development bank bonds as of June 30, 2018 and December 31, 2017 , respectively. (3) Other securities are comprised of mutual funds, which are equity securities with readily determinable fair value. Prior to the adoption of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities, these securities were reported as available-for-sale investment securities with changes in fair value recorded through other comprehensive income. Upon adoption of ASU 2016-01, which became effective January 1, 2018, these securities were reclassified from Available-for-sale investment securities to Investments in tax credit and other investments, net , with changes in fair value recorded through net income.
Schedule of gross unrealized losses and related fair value of investment securities	The following tables present the gross unrealized losses and related fair value of the Company’s investment portfolio, aggregated by investment category and the length of time that individual security has been in a continuous unrealized loss position, as of June 30, 2018 and December 31, 2017 : June 30, 2018 ($ 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 $ 192,840 $ (4,227 ) $ 436,430 $ (14,774 ) $ 629,270 $ (19,001 ) U.S. government agency and U.S. government sponsored enterprise debt securities 141,270 (3,667 ) 86,287 (1,028 ) 227,557 (4,695 ) U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 133,352 (3,911 ) 189,400 (11,409 ) 322,752 (15,320 ) Residential mortgage-backed securities 467,178 (10,405 ) 317,707 (13,241 ) 784,885 (23,646 ) Municipal securities 24,453 (755 ) 8,334 (428 ) 32,787 (1,183 ) Non-agency residential mortgage-backed securities: Investment grade 7,835 (169 ) — — 7,835 (169 ) Corporate debt securities: Investment grade 9,754 (246 ) 1,247 (3 ) 11,001 (249 ) Foreign bonds: Investment grade 76,266 (3,158 ) 383,167 (26,749 ) 459,433 (29,907 ) Asset-backed securities: Investment grade 12,560 (44 ) — — 12,560 (44 ) Total available-for-sale investment securities $ 1,065,508 $ (26,582 ) $ 1,422,572 $ (67,632 ) $ 2,488,080 $ (94,214 ) December 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 $ 168,061 $ (1,005 ) $ 472,219 $ (10,110 ) $ 640,280 $ (11,115 ) U.S. government agency and U.S. government sponsored enterprise debt securities 99,935 (623 ) 85,281 (2,862 ) 185,216 (3,485 ) U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities: Commercial mortgage-backed securities 113,775 (2,071 ) 191,827 (7,461 ) 305,602 (9,532 ) Residential mortgage-backed securities 413,621 (4,205 ) 361,809 (9,357 ) 775,430 (13,562 ) Municipal securities 8,490 (123 ) 8,588 (186 ) 17,078 (309 ) Non-agency residential mortgage-backed securities: Investment grade 4,599 (22 ) — — 4,599 (22 ) Corporate debt securities: Investment grade — — 11,905 (746 ) 11,905 (746 ) Foreign bonds: Investment grade 103,149 (1,325 ) 352,239 (17,687 ) 455,388 (19,012 ) Other securities (1) 31,215 (545 ) — — 31,215 (545 ) Total available-for-sale investment securities $ 942,845 $ (9,919 ) $ 1,483,868 $ (48,409 ) $ 2,426,713 $ (58,328 ) (1) Other securities are comprised of mutual funds, which are equity securities with readily determinable fair value. Prior to the adoption of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , these securities were reported as available-for-sale investment securities with changes in fair value recorded through other comprehensive income. Upon adoption of ASU 2016-01, which became effective January 1, 2018, these securities were reclassified from Available-for-sale investment securities, at fair value to Investments in tax credit and other investments, net , with changes in fair value recorded through net income.
Schedule of the proceeds, gross realized gains and losses, and tax expense related to the sales of available-for-sale investment securities	The following table presents the proceeds, gross realized gains and tax expense related to the sales of available-for-sale investment securities for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Proceeds from sales $ 42,085 $ 249,233 $ 256,875 $ 551,889 Gross realized gains $ 210 $ 2,720 $ 2,339 $ 5,194 Related tax expense $ 62 $ 1,144 $ 690 $ 2,184
Schedule of maturities of available-for-sale investment securities	The following table presents the scheduled maturities of available-for-sale investment securities as of June 30, 2018 : ($ in thousands) Amortized Cost Fair Value Due within one year $ 632,583 $ 603,002 Due after one year through five years 697,172 675,324 Due after five years through ten years 199,008 194,040 Due after ten years 1,270,710 1,235,078 Total available-for-sale investment securities $ 2,799,473 $ 2,707,444
Schedule of restricted equity securities	The following table presents the restricted equity securities as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 FRB stock $ 56,274 $ 56,271 FHLB stock 17,250 17,250 Total $ 73,524 $ 73,521

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
	Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of notional and gross fair values of derivatives	The following table presents the total notional and gross fair value of the Company’s derivatives as of June 30, 2018 and December 31, 2017 . The derivative asset and liability balances are presented on a gross basis, prior to the application of master netting arrangements, as included in Other assets and Accrued expenses and other liabilities , respectively, on the Consolidated Balance Sheet. ($ in thousands) June 30, 2018 December 31, 2017 Notional Amount Fair Value Notional Amount Fair Value Derivative Assets Derivative Liabilities Derivative Assets Derivative Liabilities Derivatives designated as hedging instruments: Fair value hedges: Interest rate swaps $ 35,811 $ — $ 8,647 $ 35,811 $ — $ 6,799 Net investment hedges: Foreign exchange forwards 95,515 2,316 — — — — Total derivatives designated as hedging instruments $ 131,326 $ 2,316 $ 8,647 $ 35,811 $ — $ 6,799 Derivatives not designated as hedging instruments: Interest rate swaps and options $ 11,217,468 $ 64,225 $ 91,378 $ 9,333,860 $ 58,633 $ 57,958 Foreign exchange forwards, spot and swaps 959,645 9,408 11,281 770,215 5,840 10,170 RPAs 118,024 1 77 49,033 1 8 Equity warrants — (1) 1,878 — — (1) 1,672 — Commodity swaps and options — (2) 3,628 3,159 — — — Total derivatives not designated as hedging instruments $ 12,295,137 $ 79,140 $ 105,895 $ 10,153,108 $ 66,146 $ 68,136 (1) The Company held warrants in four public companies and 14 private companies as of June 30, 2018 . In comparison, the Company held warrants in four public companies and 11 private companies as of December 31, 2017 . (2) The notional amount of the Company’s commodity contracts entered with its customers totaled 1.8 million barrels of oil and 5.2 million units of natural gas, measured in million British thermal units (“MMBTUs”) as of June 30, 2018 . The Company entered into the same notional amounts of commodity contracts with mirrored terms with third party financial institutions to mitigate its exposure.
Schedule of net gains (losses) recognized on the Consolidated Statement of Income related to derivatives designated as fair value hedge	The following table presents the net (losses) gains recognized on the Consolidated Statement of Income related to the derivatives designated as fair value hedges for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended Six Months Ended 2018 2017 2018 2017 (Losses) gains recorded in interest expense: Recognized on interest rate swaps $ (396 ) $ (706 ) $ (1,848 ) $ (1,523 ) Recognized on certificates of deposit $ 440 $ 664 $ 1,719 $ 1,352
Schedule of the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of the hedged certificates of deposit	The following table presents the carrying amount and associated cumulative basis adjustment related to the application of fair value hedge accounting that is included in the carrying amount of the hedged certificates of deposit as of June 30, 2018 : ($ in thousands) June 30, 2018 Hedged Items Currently Designated Carrying Amount of the Hedged Assets (Liabilities) (1) Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets (Liabilities) Certificates of deposit $ (29,339 ) $ 6,464 (1) Represents the full carrying amount of the hedged certificates of deposit as of June 30, 2018.
Schedule of notional amounts and gross fair values of outstanding derivative positions	The following tables represent the notional amounts and the gross fair values of foreign exchange derivative contracts outstanding as of June 30, 2018 and December 31, 2017 , respectively: ($ in thousands) June 30, 2018 Customer Counterparty Financial Counterparty Notional Amount Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 353,439 $ 5,298 $ 3,778 $ 77,152 $ 47 $ 462 Swaps 19,031 2 874 510,023 4,061 6,167 Total $ 372,470 $ 5,300 $ 4,652 $ 587,175 $ 4,108 $ 6,629 ($ in thousands) December 31, 2017 Customer Counterparty Financial Counterparty Notional Amount Fair Value Notional Fair Value Assets Liabilities Assets Liabilities Forwards and spot $ 163,389 $ 2,189 $ 752 $ 155,872 $ 662 $ 7,800 Swaps 4,318 — 98 446,636 2,989 1,520 Total $ 167,707 $ 2,189 $ 850 $ 602,508 $ 3,651 $ 9,320 The notional amounts and fair values of the commodity derivative positions outstanding as of June 30, 2018 are presented in the following table. The Company did not have any commodity contracts in 2017. ($ in thousands) June 30, 2018 Customer Counterparties Financial Counterparties Notional Fair Value Notional Fair Value Unit Amount Assets Liabilities Unit Amount Assets Liabilities Crude oil: Crude oil: Written options Barrels 736,500 $ 576 $ 271 Purchased options Barrels 736,500 $ — $ 510 Collars Barrels 812,100 1,720 — Collars Barrels 812,100 — 1,499 Swaps Barrels 292,811 925 — Swaps Barrels 292,811 — 863 Total 1,841,411 $ 3,221 $ 271 Total 1,841,411 $ — $ 2,872 Natural gas: Natural gas: Collars MMBTUs 1,540,000 $ 85 $ — Collars MMBTUs 1,540,000 $ — $ 4 Swaps MMBTUs 3,650,000 322 — Swaps MMBTUs 3,650,000 — 12 Total 5,190,000 $ 407 $ — Total 5,190,000 $ — $ 16 Total $ 3,628 $ 271 Total $ — $ 2,888 The following tables represent the notional amounts and the gross fair values of interest rate derivative contracts outstanding as of June 30, 2018 and December 31, 2017 , respectively. ($ in thousands) June 30, 2018 Customer Counterparties Financial Counterparties Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Written options $ 843,965 $ — $ 696 Purchased options $ 843,965 $ 711 $ — Sold collars and corridors 335,169 147 1,004 Collars and corridors 335,169 1,015 147 Swaps 4,425,902 15,902 76,297 Swaps 4,433,298 46,450 13,234 Total $ 5,605,036 $ 16,049 $ 77,997 Total $ 5,612,432 $ 48,176 $ 13,381 ($ in thousands) December 31, 2017 Customer Counterparties Financial Counterparties Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities Written options $ 691,548 $ — $ 223 Purchased options $ 691,548 $ 233 $ — Sold collars and corridors 247,542 204 267 Collars and corridors 247,542 271 211 Swaps 3,724,295 32,241 24,879 Swaps 3,731,385 25,684 32,378 Total $ 4,663,385 $ 32,445 $ 25,369 Total $ 4,670,475 $ 26,188 $ 32,589 The following table represents the notional amounts and the gross fair values of RPAs purchased and sold outstanding as of June 30, 2018 and December 31, 2017 , respectively: ($ in thousands) June 30, 2018 December 31, 2017 Notional Amount Fair Value Notional Amount Fair Value Assets Liabilities Assets Liabilities RPAs - protection sold $ 105,754 $ — $ 77 $ 35,208 $ — $ 8 RPAs - protection purchased 12,270 1 — 13,825 1 — Total RPAs $ 118,024 $ 1 $ 77 $ 49,033 $ 1 $ 8
Schedule of the net gains (losses) recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments	The following table presents the net gains (losses) recognized on the Company’s Consolidated Statement of Income related to derivatives not designated as hedging instruments for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Location in Consolidated Statement of Income Three Months Ended Six Months Ended 2018 2017 2018 2017 Derivatives not designated as hedging instruments: Interest rate swaps and options Derivative fees and other income $ 88 $ (678 ) $ 1,194 $ (1,744 ) Foreign exchange spot and forwards Letters of credit fees and foreign exchange income 2,646 8,378 6,503 14,216 RPAs Derivative fees and other income (56 ) — (69 ) 1 Equity warrants Ancillary loan fees and other income 598 786 439 786 Commodity swaps and options Derivative fees and other income 40 — 40 — Net gains $ 3,316 $ 8,486 $ 8,107 $ 13,259
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 Sheet 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 June 30, 2018 Total Contracts Not Subject to Master Netting Arrangements Contracts Subject to Master Netting Arrangements Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Net Amounts Gross Amounts Not Offset on the Derivative Amount Collateral Net Amount Derivative Assets $ 81,456 $ 27,141 $ 54,315 $ — $ 54,315 $ (18,672 ) (1) $ (33,615 ) (2) $ 2,028 Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Net Amounts Gross Amounts Not Offset on the Derivative Amount Collateral Net Amount Derivative Liabilities $ 114,542 $ 82,965 $ 31,577 $ — $ 31,577 $ (18,672 ) (1) $ (12,889 ) (3) $ 16 ($ in thousands) As of December 31, 2017 Total Contracts Not Subject to Master Netting Arrangements Contracts Subject to Master Netting Arrangements Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Gross Amounts Not Offset on the Derivative Collateral Net Amount Derivative Assets $ 66,146 $ 36,941 $ 29,205 $ — $ 29,205 $ (18,955 ) (1) $ (9,839 ) (2) $ 411 Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Recognized Gross Amounts Offset on the Consolidated Balance Sheet Net Amounts Gross Amounts Not Offset on the Derivative Collateral Net Amount Derivative Liabilities $ 74,935 $ 26,732 $ 48,203 $ — $ 48,203 $ (18,955 ) (1) $ (28,796 ) (3) $ 452 (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 cash and securities received against derivative assets with the same counterparty that are subject to enforceable master netting arrangements, including $10.1 million and $8.6 million of cash collateral received as of June 30, 2018 and December 31, 2017 , respectively. (3) Represents cash and securities pledged against derivative liabilities with the same counterparty that are subject to enforceable master netting arrangements, including $4.1 million and $10.7 million of cash collateral posted as of June 30, 2018 and December 31, 2017 , respectively.

Loans Receivable and Allowanc30

Loans Receivable and Allowance for Credit Losses (Tables)	6 Months Ended
	Jun. 30, 2018
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 June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 Non-PCI Loans (1) PCI Loans (2) Total (1)(2) Non-PCI Loans (1) PCI Loans (2) Total (1)(2) Commercial lending: C&I $ 11,056,225 $ 2,794 $ 11,059,019 $ 10,685,436 $ 11,795 $ 10,697,231 CRE 8,836,076 218,491 9,054,567 8,659,209 277,688 8,936,897 Multifamily residential 1,988,464 44,058 2,032,522 1,855,128 61,048 1,916,176 Construction and land 623,794 43 623,837 659,326 371 659,697 Total commercial lending 22,504,559 265,386 22,769,945 21,859,099 350,902 22,210,001 Consumer lending: Single-family residential 5,210,014 106,881 5,316,895 4,528,911 117,378 4,646,289 HELOCs 1,758,093 11,418 1,769,511 1,768,917 14,007 1,782,924 Other consumer 374,028 — 374,028 336,504 — 336,504 Total consumer lending 7,342,135 118,299 7,460,434 6,634,332 131,385 6,765,717 Total loans held-for-investment $ 29,846,694 $ 383,685 $ 30,230,379 $ 28,493,431 $ 482,287 $ 28,975,718 Allowance for loan losses (301,511 ) (39 ) (301,550 ) (287,070 ) (58 ) (287,128 ) Loans held-for-investment, net $ 29,545,183 $ 383,646 $ 29,928,829 $ 28,206,361 $ 482,229 $ 28,688,590 (1) Includes net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts of $(40.4) million and $(34.0) million as of June 30, 2018 and December 31, 2017 , respectively. (2) Includes ASC 310-30 discount of $26.8 million and $35.3 million as of June 30, 2018 and December 31, 2017 , respectively.
Summary of credit risk rating for non-PCI and PCI loans by portfolio segment	The following tables present the credit risk ratings for non-PCI loans by portfolio segment as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 Pass/Watch Special Mention Substandard Doubtful Total Non-PCI Loans Commercial lending: C&I $ 10,760,675 $ 180,741 $ 113,518 $ 1,291 $ 11,056,225 CRE 8,672,374 63,315 100,387 — 8,836,076 Multifamily residential 1,978,241 — 10,223 — 1,988,464 Construction and land 571,921 690 51,183 — 623,794 Total commercial lending 21,983,211 244,746 275,311 1,291 22,504,559 Consumer lending: Single-family residential 5,193,906 4,063 12,045 — 5,210,014 HELOCs 1,748,719 1,188 8,186 — 1,758,093 Other consumer 371,530 7 2,491 — 374,028 Total consumer lending 7,314,155 5,258 22,722 — 7,342,135 Total $ 29,297,366 $ 250,004 $ 298,033 $ 1,291 $ 29,846,694 ($ in thousands) December 31, 2017 Pass/Watch Special Mention Substandard Doubtful Total Non-PCI Loans Commercial lending: C&I $ 10,369,516 $ 114,769 $ 180,269 $ 20,882 $ 10,685,436 CRE 8,484,635 65,616 108,958 — 8,659,209 Multifamily residential 1,839,958 — 15,170 — 1,855,128 Construction and land 614,441 4,590 40,295 — 659,326 Total commercial lending 21,308,550 184,975 344,692 20,882 21,859,099 Consumer lending: Single-family residential 4,490,672 16,504 21,735 — 4,528,911 HELOCs 1,744,903 11,900 12,114 — 1,768,917 Other consumer 333,895 111 2,498 — 336,504 Total consumer lending 6,569,470 28,515 36,347 — 6,634,332 Total $ 27,878,020 $ 213,490 $ 381,039 $ 20,882 $ 28,493,431 The following tables present the credit risk ratings for PCI loans by portfolio segment as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 Pass/Watch Special Mention Substandard Doubtful Total PCI Loans Commercial lending: C&I $ 2,551 $ — $ 243 $ — $ 2,794 CRE 189,307 4,813 24,371 — 218,491 Multifamily residential 41,182 — 2,876 — 44,058 Construction and land 43 — — — 43 Total commercial lending 233,083 4,813 27,490 — 265,386 Consumer lending: Single-family residential 105,219 275 1,387 — 106,881 HELOCs 10,705 209 504 — 11,418 Total consumer lending 115,924 484 1,891 — 118,299 Total (1) $ 349,007 $ 5,297 $ 29,381 $ — $ 383,685 ($ in thousands) December 31, 2017 Pass/Watch Special Mention Substandard Doubtful Total PCI Loans Commercial lending: C&I $ 10,712 $ 57 $ 1,026 $ — $ 11,795 CRE 238,605 531 38,552 — 277,688 Multifamily residential 56,720 — 4,328 — 61,048 Construction and land 44 — 327 — 371 Total commercial lending 306,081 588 44,233 — 350,902 Consumer lending: Single-family residential 113,905 1,543 1,930 — 117,378 HELOCs 12,642 — 1,365 — 14,007 Total consumer lending 126,547 1,543 3,295 — 131,385 Total (1) $ 432,628 $ 2,131 $ 47,528 $ — $ 482,287 (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 June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 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 Commercial lending: C&I $ 86,959 $ 6 $ 86,965 $ 28,491 $ 28,606 $ 57,097 $ 10,912,163 $ 11,056,225 CRE 2,913 — 2,913 5,851 19,897 25,748 8,807,415 8,836,076 Multifamily residential 1,378 536 1,914 1,727 — 1,727 1,984,823 1,988,464 Construction and land — — — — — — 623,794 623,794 Total commercial lending 91,250 542 91,792 36,069 48,503 84,572 22,328,195 22,504,559 Consumer lending: Single-family residential 18,699 4,678 23,377 418 7,207 7,625 5,179,012 5,210,014 HELOCs 6,018 1,188 7,206 1,889 6,246 8,135 1,742,752 1,758,093 Other consumer 20 7 27 — 2,491 2,491 371,510 374,028 Total consumer lending 24,737 5,873 30,610 2,307 15,944 18,251 7,293,274 7,342,135 Total $ 115,987 $ 6,415 $ 122,402 $ 38,376 $ 64,447 $ 102,823 $ 29,621,469 $ 29,846,694 ($ in thousands) December 31, 2017 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 Commercial lending: C&I $ 30,964 $ 82 $ 31,046 $ 27,408 $ 41,805 $ 69,213 $ 10,585,177 $ 10,685,436 CRE 3,414 466 3,880 5,430 21,556 26,986 8,628,343 8,659,209 Multifamily residential 4,846 14 4,860 1,418 299 1,717 1,848,551 1,855,128 Construction and land 758 — 758 — 3,973 3,973 654,595 659,326 Total commercial lending 39,982 562 40,544 34,256 67,633 101,889 21,716,666 21,859,099 Consumer lending: Single-family residential 13,269 5,355 18,624 6 5,917 5,923 4,504,364 4,528,911 HELOCs 4,286 4,186 8,472 89 3,917 4,006 1,756,439 1,768,917 Other consumer 14 23 37 — 2,491 2,491 333,976 336,504 Total consumer lending 17,569 9,564 27,133 95 12,325 12,420 6,594,779 6,634,332 Total $ 57,551 $ 10,126 $ 67,677 $ 34,351 $ 79,958 $ 114,309 $ 28,311,445 $ 28,493,431
Summary of additions and modifications to non-PCI troubled debt restructurings	The following tables present the additions to non-PCI TDRs for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Loans Modified as TDRs During the Three Months Ended June 30, 2018 2017 Number Pre- Modification Post- Modification (1) Financial (2) Number Pre- Modification Post- Modification (1) Financial (2) Commercial lending: C&I — $ — $ — $ — 6 $ 17,039 $ 15,673 $ 10,010 CRE 1 $ 750 $ 837 $ — — $ — $ — $ — Multifamily residential — $ — $ — $ — 1 $ 3,655 $ 3,638 $ 107 Consumer lending: Single-family residential 2 $ 405 $ 404 $ (26 ) — $ — $ — $ — HELOCs 2 $ 1,546 $ 1,536 $ — — $ — $ — $ — Loans Modified as TDRs During the Six Months Ended June 30, ($ in thousands) 2018 2017 Number Pre- Post- (1) Financial (2) Number Pre- Post- (1) Financial (2) Commercial lending: C&I — $ — $ — $ — 8 $ 18,189 $ 17,272 $ 11,202 CRE 1 $ 750 $ 837 $ — 1 $ 1,527 $ 1,494 $ — Multifamily residential — $ — $ — $ — 1 $ 3,655 $ 3,638 $ 107 Consumer lending: Single-family residential 2 $ 405 $ 404 $ (26 ) — $ — $ — $ — HELOCs 2 $ 1,546 $ 1,536 $ — — $ — $ — $ — (1) Includes subsequent payments after modification and reflects the balance as of June 30, 2018 and 2017 . (2) The financial impact includes increases (decreases) in charge-offs and specific reserves recorded at the modification date. The following tables present the non-PCI TDR modifications for the three and six months ended June 30, 2018 and 2017 by modification type: ($ in thousands) Modification Type During the Three Months Ended June 30, 2018 2017 Principal (1) Principal (2) Interest Other Total Principal (1) Principal (2) Interest Other Total Commercial lending: C&I $ — $ — $ — $ — $ — $ 3,388 $ 12,285 $ — $ — $ 15,673 CRE — — 837 — 837 — — — — — Multifamily residential — — — — — 3,638 — — — 3,638 Total commercial lending — — 837 — 837 7,026 12,285 — — 19,311 Consumer lending: Single-family residential 65 — — 339 404 — — — — — HELOCs 1,464 — — 72 1,536 — — — — — Total consumer lending 1,529 — — 411 1,940 — — — — — Total $ 1,529 $ — $ 837 $ 411 $ 2,777 $ 7,026 $ 12,285 $ — $ — $ 19,311 ($ in thousands) Modification Type During the Six Months Ended June 30, 2018 2017 Principal (1) Principal (2) Interest Other Total Principal (1) Principal (2) Interest Other Total Commercial lending: C&I $ — $ — $ — $ — $ — $ 3,388 $ 13,884 $ — $ — $ 17,272 CRE — — 837 — 837 1,494 — — — 1,494 Multifamily residential — — — — — 3,638 — — — 3,638 Total commercial lending — — 837 — 837 8,520 13,884 — — 22,404 Consumer lending: Single-family residential 65 — — 339 404 — — — — — HELOCs 1,464 — — 72 1,536 — — — — — Total consumer lending 1,529 — — 411 1,940 — — 846 — — Total $ 1,529 $ — $ 837 $ 411 $ 2,777 $ 8,520 $ 13,884 $ 6,722 $ — $ 22,404 (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.
Summary of TDR loans subsequently defaulted	The following tables present information on loans modified as TDRs within the previous 12 months that have subsequently defaulted during the three and six months ended June 30, 2018 and 2017 , and were still in default at the respective period end: ($ in thousands) Loans Modified as TDRs that Subsequently Defaulted During the Three Months Ended June 30, 2018 2017 Number of Recorded Number of Recorded Consumer lending: HELOCs — $ — 1 $ 48 ($ in thousands) Loans Modified as TDRs that Subsequently Defaulted During the Six Months Ended June 30, 2018 2017 Number of Recorded Number of Recorded Consumer lending: HELOCs — $ — 1 $ 48
Summary of non-PCI impaired loans	The following tables present information on non-PCI impaired loans as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Commercial lending: C&I $ 85,975 $ 27,397 $ 36,257 $ 63,654 $ 10,920 CRE 38,567 26,677 5,469 32,146 520 Multifamily residential 6,562 2,998 3,104 6,102 99 Total commercial lending 131,104 57,072 44,830 101,902 11,539 Consumer lending: Single-family residential 17,109 4,037 11,879 15,916 53 HELOCs 9,642 4,493 4,989 9,482 78 Other consumer 2,491 — 2,491 2,491 2,491 Total consumer lending 29,242 8,530 19,359 27,889 2,622 Total non-PCI impaired loans $ 160,346 $ 65,602 $ 64,189 $ 129,791 $ 14,161 ($ in thousands) December 31, 2017 Unpaid Principal Balance Recorded Investment With No Allowance Recorded Investment With Allowance Total Recorded Investment Related Allowance Commercial lending: C&I $ 130,773 $ 36,086 $ 62,599 $ 98,685 $ 16,094 CRE 41,248 28,699 6,857 35,556 684 Multifamily residential 11,164 8,019 2,617 10,636 88 Construction and land 4,781 3,973 — 3,973 — Total commercial lending 187,966 76,777 72,073 148,850 16,866 Consumer lending: Single-family residential 15,501 — 14,338 14,338 534 HELOCs 5,484 2,287 2,921 5,208 4 Other consumer 2,491 — 2,491 2,491 2,491 Total consumer lending 23,476 2,287 19,750 22,037 3,029 Total non-PCI impaired loans $ 211,442 $ 79,064 $ 91,823 $ 170,887 $ 19,895
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 for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Average Recognized Interest Income (1) Average Recognized Interest Income (1) Average Recorded Investment Recognized Interest Income (1) Average Recognized Interest Income (1) Commercial lending: C&I $ 67,342 $ 1,494 $ 113,858 $ 140 $ 67,290 $ 2,893 $ 119,608 $ 362 CRE 32,524 837 37,897 33 32,813 1,666 38,116 80 Multifamily residential 6,161 58 12,720 81 6,203 127 12,771 129 Construction and land — — 4,414 — — — 4,584 — Total commercial lending 106,027 2,389 168,889 254 106,306 4,686 175,079 571 Consumer lending: Single-family residential 15,962 115 16,985 35 16,012 269 17,038 93 HELOCs 9,502 138 4,541 13 9,514 249 4,548 32 Other consumer 2,491 47 — — 2,491 92 — — Total consumer lending 27,955 300 21,526 48 28,017 610 21,586 125 Total non-PCI impaired loans $ 133,982 $ 2,689 $ 190,415 $ 302 $ 134,323 $ 5,296 $ 196,665 $ 696 (1) Includes interest recognized on accruing non-PCI TDRs. Interest payments received on nonaccrual non-PCI loans are reflected as a reduction to principal, not as interest income.
Summary of activities in the allowance for credit losses	The following table presents a summary of activities in the allowance for loan losses by portfolio segment for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Non-PCI Loans Allowance for non-PCI loans, beginning of period $ 297,607 $ 263,007 $ 287,070 $ 260,402 Provision for loan losses on non-PCI loans 15,139 10,680 35,072 18,726 Gross charge-offs: Commercial lending: C&I (13,534 ) (5,386 ) (31,979 ) (12,443 ) Construction and land — (1 ) — (149 ) Consumer lending: Single-family residential — (1 ) (1 ) (1 ) Other consumer (162 ) (3 ) (179 ) (7 ) Total gross charge-offs (13,696 ) (5,391 ) (32,159 ) (12,600 ) Gross recoveries: Commercial lending: C&I 511 7,038 8,198 7,493 CRE 2 423 429 992 Multifamily residential 1,061 128 1,394 695 Construction and land 258 88 693 112 Consumer lending: Single-family residential 629 243 813 254 HELOCs — — — 24 Other consumer — 22 1 140 Total gross recoveries 2,461 7,942 11,528 9,710 Net (charge-offs) recoveries (11,235 ) 2,551 (20,631 ) (2,890 ) Allowance for non-PCI loans, end of period 301,511 276,238 301,511 276,238 PCI Loans Allowance for PCI loans, beginning of period 47 87 58 118 Reversal of loan losses on PCI loans (8 ) (9 ) (19 ) (40 ) Allowance for PCI loans, end of period 39 78 39 78 Allowance for loan losses $ 301,550 $ 276,316 $ 301,550 $ 276,316 The following table presents a summary of activities in the allowance for unfunded credit reserves for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended Six Months Ended 2018 2017 2018 2017 Allowance for unfunded credit reserves, beginning of period $ 13,614 $ 15,174 $ 13,318 $ 16,121 Provision for (reversal of) unfunded credit reserves 405 14 701 (933 ) Allowance for unfunded credit reserves, end of period $ 14,019 $ 15,188 $ 14,019 $ 15,188
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 June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 Commercial Lending Consumer Lending C&I CRE Multifamily Residential Construction and Land Single- Family Residential HELOCs Other Consumer Total Allowance for loan losses Individually evaluated for impairment $ 10,920 $ 520 $ 99 $ — $ 53 $ 78 $ 2,491 $ 14,161 Collectively evaluated for impairment 151,484 44,061 18,387 30,362 33,335 7,199 2,522 287,350 Acquired with deteriorated credit quality — 39 — — — — — 39 Total $ 162,404 $ 44,620 $ 18,486 $ 30,362 $ 33,388 $ 7,277 $ 5,013 $ 301,550 Recorded investment in loans Individually evaluated for impairment $ 63,654 $ 32,146 $ 6,102 $ — $ 15,916 $ 9,482 $ 2,491 $ 129,791 Collectively evaluated for impairment 10,992,571 8,803,930 1,982,362 623,794 5,194,098 1,748,611 371,537 29,716,903 Acquired with deteriorated credit quality (1) 2,794 218,491 44,058 43 106,881 11,418 — 383,685 Total (1) $ 11,059,019 $ 9,054,567 $ 2,032,522 $ 623,837 $ 5,316,895 $ 1,769,511 $ 374,028 $ 30,230,379 ($ in thousands) December 31, 2017 Commercial Lending Consumer Lending C&I CRE Multifamily Residential Construction and Land Single- Family Residential HELOCs Other Consumer Total Allowance for loan losses Individually evaluated for impairment $ 16,094 $ 684 $ 88 $ — $ 534 $ 4 $ 2,491 $ 19,895 Collectively evaluated for impairment 146,964 40,495 19,021 26,881 25,828 7,350 636 267,175 Acquired with deteriorated credit quality — 58 — — — — — 58 Total $ 163,058 $ 41,237 $ 19,109 $ 26,881 $ 26,362 $ 7,354 $ 3,127 $ 287,128 Recorded investment in loans Individually evaluated for impairment $ 98,685 $ 35,556 $ 10,636 $ 3,973 $ 14,338 $ 5,208 $ 2,491 $ 170,887 Collectively evaluated for impairment 10,586,751 8,623,653 1,844,492 655,353 4,514,573 1,763,709 334,013 28,322,544 Acquired with deteriorated credit quality (1) 11,795 277,688 61,048 371 117,378 14,007 — 482,287 Total (1) $ 10,697,231 $ 8,936,897 $ 1,916,176 $ 659,697 $ 4,646,289 $ 1,782,924 $ 336,504 $ 28,975,718 (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 and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, Six Months Ended June 30, 2018 2017 2018 2017 Accretable yield for PCI loans, beginning of period $ 95,864 $ 127,990 $ 101,977 $ 136,247 Accretion (11,084 ) (11,082 ) (20,218 ) (21,361 ) Changes in expected cash flows 272 1,717 3,293 3,739 Accretable yield for PCI loans, end of period $ 85,052 $ 118,625 $ 85,052 $ 118,625
Schedule of loans purchases into the held-for-investment portfolio, transfers from held-for investment to held for-sale and sales of loans	The following tables present information on the loan purchases into the held-for-investment portfolio, transfers from held-for-investment to held-for-sale, and sales during the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, 2018 Commercial Lending Consumer Lending C&I CRE Multifamily Construction Single-Family Other Total Loans transferred from held-for-investment to held-for-sale $ 99,449 $ 30,415 $ — $ — $ — $ — $ 129,864 (1) Sales $ 140,326 $ 30,415 $ — $ — $ 8,175 $ — $ 178,916 (2)(3)(4) Purchases $ 285,615 $ — $ 3,249 $ — $ 20,912 $ — $ 309,776 (5) ($ in thousands) Three Months Ended June 30, 2017 Commercial Lending Consumer Lending C&I CRE Multifamily Construction Single-Family Other Total Loans transferred from held-for-investment to held-for-sale $ 58,817 $ 5,668 $ 532 $ 687 $ 249 $ — $ 65,953 (1) Sales $ 76,441 $ 5,668 $ 532 $ 687 $ 5,432 $ — $ 88,760 (2)(3)(4) Purchases $ 220,612 $ — $ 714 $ — $ 128 $ — $ 221,454 (5) ($ in thousands) Six Months Ended June 30, 2018 Commercial Lending Consumer Lending C&I CRE Multifamily Construction Single-Family Other Total Loans transferred from held-for-investment to held-for-sale $ 245,840 $ 39,791 $ — $ — $ — $ — $ 285,631 (1) Sales $ 242,691 $ 39,791 $ — $ — $ 10,721 $ — $ 293,203 (2)(3)(4) Purchases $ 350,362 $ — $ 3,435 $ — $ 36,025 $ — $ 389,822 (5) ($ in thousands) Six Months Ended June 30, 2017 Commercial Lending Consumer Lending C&I CRE Multifamily Construction Single-Family Other Total Loans transferred from held-for-investment to held-for-sale $ 324,076 $ 18,433 $ 532 $ 687 $ 249 $ — $ 343,977 (1) Sales $ 313,120 $ 18,433 $ 532 $ 687 $ 9,742 $ 22,191 $ 364,705 (2)(3)(4) Purchases $ 367,728 $ — $ 840 $ — $ 128 $ — $ 368,696 (5) (1) The Company recorded $13.3 million and $13.4 million in write-downs to the allowance for loan losses related to loans transferred from held-for-investment to held-for-sale for the three and six months ended June 30, 2018 , respectively, and $117 thousand and $209 thousand for the three and six months ended June 30, 2017 , respectively. (2) Includes originated loans sold of $103.5 million and $193.2 million for the three and six months ended June 30, 2018 , respectively, and $ 38.3 million and $67.6 million for the three and six months ended June 30, 2017 , respectively. Originated loans sold during the three and six months ended June 30, 2018 and 2017 were primarily C&I and CRE loans. (3) Includes purchased loans sold in the secondary market of $75.4 million and $100.0 million for the three and six months ended June 30, 2018 , respectively, and $50.5 million and $297.1 million for the three and six months ended June 30, 2017 , respectively. (4) Net gains on sales of loans, excluding the lower of cost or fair value adjustments, were $2.3 million and $3.9 million for the three and six months ended June 30, 2018 , respectively, and $1.6 million and $4.4 million for the three and six months ended June 30, 2017 , respectively. No lower of cost or fair value adjustments were recorded for the three and six months ended June 30, 2018 . In comparison, the Company reversed the lower of cost or fair value adjustment of $8 thousand during the three months ended June 30, 2017 and recorded a lower of cost or fair value adjustment of $61 thousand for the six months ended June 30, 2017 . These adjustments were included in Net gains on sales of loans on the Consolidated Statement of Income. (5) C&I loan purchases for each of the three and six months ended June 30, 2018 and 2017 were mainly comprised of C&I syndicated loans.

Investments in Qualified Affo31

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Tables)	6 Months Ended
	Jun. 30, 2018
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 Company’s investments in qualified affordable housing partnerships, net, and related unfunded commitments as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 Investments in qualified affordable housing partnerships, net $ 152,556 $ 162,824 Accrued expenses and other liabilities — Unfunded commitments $ 52,110 $ 55,815
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 three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended Six Months Ended 2018 2017 2018 2017 Tax credits and other tax benefits recognized $ 8,940 $ 9,566 $ 18,095 $ 19,187 Amortization expense included in income tax expense $ 6,700 $ 7,051 $ 13,773 $ 14,001
Schedule of tax credits and other investments, net and accrued expenses for unfunded commitments	The following table presents the Company’s investments in tax credit and other investments, net, and related unfunded commitments as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 Investments in tax credit and other investments, net $ 242,595 $ 224,551 Accrued expenses and other liabilities — Unfunded commitments $ 109,432 $ 113,372
Schedule of additional information related to tax credits and other investments, net	The following table presents additional information related to the Company’s investments in tax credit and other investments, net, for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended Six Months Ended 2018 2017 2018 2017 Amortization expense included in noninterest expense $ 20,481 $ 27,872 $ 37,881 $ 42,232

Goodwill and Other Intangible32

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule of finite-lived intangible assets	The following table presents the gross carrying value of core deposit intangible assets and accumulated amortization as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 Gross balance (1) $ 86,099 $ 100,166 Accumulated amortization (1) (68,935 ) (79,112 ) Net carrying balance (1) $ 17,164 $ 21,054 (1) Excludes fully amortized core deposit intangible assets.
Schedule of estimated future amortization expense of core deposit intangibles	The following table presents the estimated future amortization expense of core deposit intangibles as of June 30, 2018 : Year Ended December 31, Amount ($ in thousands) Remainder of 2018 $ 2,635 2019 4,518 2020 3,634 2021 2,749 2022 1,865 Thereafter 1,763 Total $ 17,164

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Schedule of credit-related commitments	The following table presents the Company’s credit-related commitments as of June 30, 2018 and December 31, 2017 : ($ in thousands) June 30, 2018 December 31, 2017 Loan commitments $ 5,122,314 $ 5,075,480 Commercial letters of credit and SBLCs $ 1,702,514 $ 1,655,897

Revenue from Contracts with C34

Revenue from Contracts with Customers (Tables)	6 Months Ended
	Jun. 30, 2018
Revenue from Contract with Customer [Abstract]
Disaggregation of Revenue	The following tables present revenue from contracts with customers within the scope of ASC 606 and other noninterest income, segregated by operating segments for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, 2018 Retail Commercial Other Total Noninterest income: Revenue from contracts with customers (1) : Branch fees: Deposit service charges and related fee income $ 5,738 $ 3,000 $ 248 $ 8,986 Card income 933 221 — 1,154 Wealth management fees 4,501 — — 4,501 Total revenue from contracts with customers $ 11,172 $ 3,221 $ 248 $ 14,641 Other sources of noninterest income (2) 3,413 27,523 2,691 33,627 Total noninterest income $ 14,585 $ 30,744 $ 2,939 $ 48,268 ($ in thousands) Three Months Ended June 30, 2017 Retail Commercial Other Total Noninterest income: Revenue from contracts with customers (1) : Branch fees: Deposit service charges and related fee income $ 6,157 $ 2,812 $ 121 $ 9,090 Card income 1,029 202 — 1,231 Wealth management fees 3,249 132 — 3,381 Total revenue from contracts with customers $ 10,435 $ 3,146 $ 121 $ 13,702 Other sources of noninterest income (2) 3,206 23,438 6,898 33,542 Total noninterest income $ 13,641 $ 26,584 $ 7,019 $ 47,244 ($ in thousands) Six Months Ended June 30, 2018 Retail Commercial Other Total Noninterest income: Revenue from contracts with customers (1) : Branch fees: Deposit service charges and related fee income $ 11,752 $ 6,014 $ 406 $ 18,172 Card income 2,003 395 — 2,398 Wealth management fees 7,297 157 — 7,454 Total revenue from contracts with customers $ 21,052 $ 6,566 $ 406 $ 28,024 Other sources of noninterest income (2) 37,981 51,616 5,091 94,688 Total noninterest income $ 59,033 $ 58,182 $ 5,497 $ 122,712 ($ in thousands) Six Months Ended June 30, 2017 Retail Commercial Other Total Noninterest income: Revenue from contracts with customers (1) : Branch fees: Deposit service charges and related fee income $ 11,994 $ 5,554 $ 226 $ 17,774 Card income 2,056 415 — 2,471 Wealth management fees 6,495 1,221 — 7,716 Total revenue from contracts with customers $ 20,545 $ 7,190 $ 226 $ 27,961 Other sources of noninterest income (2) 6,660 45,128 83,323 135,111 Total noninterest income $ 27,205 $ 52,318 $ 83,549 $ 163,072 (1) There were no adjustments to the Company’s financial statements recorded as a result of the adoption of ASC 606. For comparability, the Company has adjusted prior period amounts to conform to the current period’s presentation. (2) Primarily represents revenue from contracts with customers that are out of the scope of ASC 606.

Stock Compensation Plans (Table

Stock Compensation Plans (Tables)	6 Months Ended
	Jun. 30, 2018
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 and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended Six Months Ended 2018 2017 2018 2017 Stock compensation costs $ 7,057 $ 4,964 $ 13,215 $ 10,115 Related net tax benefits for stock compensation plans $ 97 $ 49 $ 4,875 $ 4,463
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 six months ended June 30, 2018 based on the target amount of awards: Six Months Ended June 30, 2018 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 1,166,580 $ 42.00 424,299 $ 41.44 Granted 401,830 67.30 120,286 70.13 Vested (324,051 ) 40.10 (133,295 ) 41.15 Forfeited (58,396 ) 47.65 — — Outstanding, at end of period 1,185,963 $ 50.81 411,290 $ 49.93

Stockholders' Equity and Earn36

Stockholders' Equity and Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2018
Stockholders' Equity and Earnings Per Share [Abstract]
Schedule of earnings per share calculations	The following table presents the EPS calculations for the three and six months ended June 30, 2018 and 2017 : ($ and shares in thousands, except per share data) Three Months Ended Six Months Ended 2018 2017 2018 2017 Basic Net income $ 172,349 $ 118,330 $ 359,381 $ 288,066 Basic weighted-average number of shares outstanding 144,899 144,485 144,782 144,368 Basic EPS $ 1.19 $ 0.82 $ 2.48 $ 2.00 Diluted Net income $ 172,349 $ 118,330 $ 359,381 $ 288,066 Basic weighted-average number of shares outstanding 144,899 144,485 144,782 144,368 Diluted potential common shares (1) 1,192 1,255 1,264 1,406 Diluted weighted-average number of shares outstanding 146,091 145,740 146,046 145,774 Diluted EPS $ 1.18 $ 0.81 $ 2.46 $ 1.98 (1) Includes dilutive shares from RSUs and warrants for the three and six months ended June 30, 2018 and 2017 .

Accumulated Other Comprehensi37

Accumulated Other Comprehensive Income (Loss) (Tables)	6 Months Ended
	Jun. 30, 2018
Equity [Abstract]
Schedule of the changes in components of accumulated other comprehensive income (loss) balances	The following tables present the changes in the components of AOCI balances for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, 2018 2017 Available- Foreign (1) Total Available- Foreign (1) Total Beginning balance $ (55,981 ) $ 177 $ (55,804 ) $ (25,151 ) $ (18,367 ) $ (43,518 ) Net unrealized (losses) gains arising during the period (8,693 ) (6,822 ) (15,515 ) 7,777 3,136 10,913 Amounts reclassified from AOCI (148 ) — (148 ) (1,576 ) — (1,576 ) Changes, net of taxes (8,841 ) (6,822 ) (15,663 ) 6,201 3,136 9,337 Ending balance $ (64,822 ) $ (6,645 ) $ (71,467 ) $ (18,950 ) $ (15,231 ) $ (34,181 ) ($ in thousands) Six Months Ended June 30, 2018 2017 Available- Foreign (1) Total Available- Foreign (1) Total Beginning balance $ (30,898 ) $ (6,621 ) $ (37,519 ) $ (28,772 ) $ (19,374 ) $ (48,146 ) Cumulative effect of change in accounting principle related to marketable equity securities (2) 385 — 385 — — — Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate (3) (6,656 ) — (6,656 ) — — — Beginning balance, adjusted (37,169 ) (6,621 ) (43,790 ) (28,772 ) (19,374 ) (48,146 ) Net unrealized (losses) gains arising during the period (26,004 ) (24 ) (26,028 ) 12,832 4,143 16,975 Amounts reclassified from AOCI (1,649 ) — (1,649 ) (3,010 ) — (3,010 ) Changes, net of taxes (27,653 ) (24 ) (27,677 ) 9,822 4,143 13,965 Ending balance $ (64,822 ) $ (6,645 ) $ (71,467 ) $ (18,950 ) $ (15,231 ) $ (34,181 ) (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. (2) Represents the impact of the adoption in the first quarter of 2018 of ASU 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information. (3) Represents amounts reclassified from AOCI to retained earnings due to early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.
Schedule of components of other comprehensive income (loss), reclassifications to net income and the related tax effects	The following tables present the components of other comprehensive income (loss), reclassifications to net income and the related tax effects for the three and six months ended June 30, 2018 and 2017 : ($ in thousands) Three Months Ended June 30, 2018 2017 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax Available-for-sale investment securities: Net unrealized (losses) gains arising during the period $ (12,342 ) $ 3,649 $ (8,693 ) $ 13,420 $ (5,643 ) $ 7,777 Net realized gains reclassified into net income (1) (210 ) 62 (148 ) (2,720 ) 1,144 (1,576 ) Net change (12,552 ) 3,711 (8,841 ) 10,700 (4,499 ) 6,201 Foreign currency translation adjustments: Net unrealized (losses) gains arising during the period (6,822 ) — (6,822 ) 3,136 — 3,136 Net change (6,822 ) — (6,822 ) 3,136 — 3,136 Other comprehensive (loss) income $ (19,374 ) $ 3,711 $ (15,663 ) $ 13,836 $ (4,499 ) $ 9,337 ($ in thousands) Six Months Ended June 30, 2018 2017 Before-Tax Tax Effect Net-of-Tax Before-Tax Tax Effect Net-of-Tax Available-for-sale investment securities: Net unrealized (losses) gains arising during the period $ (36,919 ) $ 10,915 $ (26,004 ) $ 22,141 $ (9,309 ) $ 12,832 Net realized gains reclassified into net income (1) (2,339 ) 690 (1,649 ) (5,194 ) 2,184 (3,010 ) Net change (39,258 ) 11,605 (27,653 ) 16,947 (7,125 ) 9,822 Foreign currency translation adjustments: Net unrealized (losses) gains arising during the period (24 ) — (24 ) 4,143 — 4,143 Net change (24 ) — (24 ) 4,143 — 4,143 Other comprehensive (loss) income $ (39,282 ) $ 11,605 $ (27,677 ) $ 21,090 $ (7,125 ) $ 13,965 (1) For the three and six months ended June 30, 2018 and 2017 , pre-tax amounts were reported in Net gains on sales of available-for-sale investment securities on the Consolidated Statement of Income.

Business Segments (Tables)

Business Segments (Tables)	6 Months Ended
	Jun. 30, 2018
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 and six months ended June 30, 2018 and 2017 : ($ in thousands) Retail Banking Commercial Banking Other Total Three Months Ended June 30, 2018 Interest income $ 110,808 $ 261,567 $ 27,936 $ 400,311 Charge for funds used (56,915 ) (126,782 ) (16,674 ) (200,371 ) Interest spread on funds used 53,893 134,785 11,262 199,940 Interest expense (31,991 ) (11,635 ) (15,006 ) (58,632 ) Credit on funds provided 158,446 30,728 11,197 200,371 Interest spread on funds provided (used) 126,455 19,093 (3,809 ) 141,739 Net interest income before provision for credit losses $ 180,348 $ 153,878 $ 7,453 $ 341,679 Provision for credit losses $ 3,414 $ 12,122 $ — $ 15,536 Noninterest income $ 14,585 $ 30,744 $ 2,939 $ 48,268 Noninterest expense $ 86,144 $ 56,706 $ 34,569 $ 177,419 Segment income (loss) before income taxes $ 105,375 $ 115,794 $ (24,177 ) $ 196,992 Segment income after income taxes $ 75,496 $ 83,210 $ 13,643 $ 172,349 As of June 30, 2018: Segment assets $ 9,816,103 $ 22,199,992 $ 6,056,859 $ 38,072,954 ($ in thousands) Retail Commercial Other Total Three Months Ended June 30, 2017 Interest income $ 88,752 $ 205,873 $ 28,150 $ 322,775 Charge for funds used (33,139 ) (77,750 ) (14,517 ) (125,406 ) Interest spread on funds used 55,613 128,123 13,633 197,369 Interest expense (18,377 ) (5,184 ) (9,123 ) (32,684 ) Credit on funds provided 106,094 12,623 6,689 125,406 Interest spread on funds provided (used) 87,717 7,439 (2,434 ) 92,722 Net interest income before (reversal of) provision for credit losses $ 143,330 $ 135,562 $ 11,199 $ 290,091 (Reversal of) provision for credit losses $ (664 ) $ 11,349 $ — $ 10,685 Noninterest income $ 13,641 $ 26,584 $ 7,019 $ 47,244 Noninterest expense $ 79,950 $ 44,551 $ 44,464 $ 168,965 Segment income (loss) before income taxes $ 77,685 $ 106,246 $ (26,246 ) $ 157,685 Segment income after income taxes $ 45,679 $ 62,766 $ 9,885 $ 118,330 As of June 30, 2017: Segment assets $ 8,438,706 $ 20,456,579 $ 7,022,332 $ 35,917,617 ($ in thousands) Retail Commercial Other Total Six Months Ended June 30, 2018 Interest income $ 215,518 $ 501,144 $ 55,522 $ 772,184 Charge for funds used (106,188 ) (238,148 ) (35,001 ) (379,337 ) Interest spread on funds used 109,330 262,996 20,521 392,847 Interest expense (56,931 ) (20,814 ) (26,067 ) (103,812 ) Credit on funds provided 303,897 56,176 19,264 379,337 Interest spread on funds provided (used) 246,966 35,362 (6,803 ) 275,525 Net interest income before provision for credit losses $ 356,296 $ 298,358 $ 13,718 $ 668,372 Provision for credit losses $ 6,507 $ 29,247 $ — $ 35,754 Noninterest income $ 59,033 $ 58,182 $ 5,497 $ 122,712 Noninterest expense $ 168,112 $ 121,726 $ 56,716 $ 346,554 Segment income (loss) before income taxes $ 240,710 $ 205,567 $ (37,501 ) $ 408,776 Segment income after income taxes $ 172,464 $ 147,572 $ 39,345 $ 359,381 As of June 30, 2018: Segment assets $ 9,816,103 $ 22,199,992 $ 6,056,859 $ 38,072,954 ($ in thousands) Retail Commercial Other Total Six Months Ended June 30, 2017 Interest income $ 169,777 $ 398,292 $ 57,375 $ 625,444 Charge for funds used (60,877 ) (142,259 ) (42,684 ) (245,820 ) Interest spread on funds used 108,900 256,033 14,691 379,624 Interest expense (34,560 ) (10,282 ) (18,389 ) (63,231 ) Credit on funds provided 208,640 24,666 12,514 245,820 Interest spread on funds provided (used) 174,080 14,384 (5,875 ) 182,589 Net interest income before (reversal of) provision for credit losses $ 282,980 $ 270,417 $ 8,816 $ 562,213 (Reversal of) provision for credit losses $ (286 ) $ 18,039 $ — $ 17,753 Noninterest income $ 27,205 $ 52,318 $ 83,549 $ 163,072 Noninterest expense $ 152,794 $ 98,924 $ 70,125 $ 321,843 Segment income before income taxes $ 157,677 $ 205,772 $ 22,240 $ 385,689 Segment income after income taxes $ 92,714 $ 121,562 $ 73,790 $ 288,066 As of June 30, 2017: Segment assets $ 8,438,706 $ 20,456,579 $ 7,022,332 $ 35,917,617

Basis of Presentation (Details)

Basis of Presentation (Details)	Jun. 30, 2018trust
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of wholly-owned subsidiaries that are statutory business trusts (the Trusts)	6

Current Accounting Developmen40

Current Accounting Developments Current Accounting Developments (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2018	Dec. 31, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Marketable equity securities			$ 31,900
Cumulative effect of a change in accounting principle	[1]		(160)
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate	[2]	$ 0
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of a change in accounting principle	[1]		(545)
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate	[2]	6,656
AOCI, Net of Tax
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of a change in accounting principle	[1]		385
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate	[2]	$ (6,656)
ASU 2016-01 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of a change in accounting principle			(545)
ASU 2016-01 | AOCI, Net of Tax
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative effect of a change in accounting principle			$ 385
[1]	Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities in the first quarter of 2018. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.
[2]	Represents amounts reclassified from AOCI to retained earnings due to the early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income in the first quarter of 2018. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.

Dispositions and Held-for-Sale

Dispositions and Held-for-Sale (Sales Leaseback) (Details) - Commercial Property In San Francisco $ in Millions	3 Months Ended
	Mar. 31, 2017USD ($)
Sale Leaseback Transaction [Line Items]
Sales price	$ 120.6
Net book value	31.6
Pre-tax profit from sale	85.4
Selling costs	3.6
Current period gain recognized	71.7
Deferred gain	$ 13.7

Dispositions and Held-for-Sal42

Dispositions and Held-for-Sale (Held-for-Sale) (Details) $ in Thousands	Jun. 30, 2018USD ($)	Dec. 31, 2017USD ($)	Nov. 11, 2017banking_branch
Long Lived Assets Held-for-sale [Line Items]
Branch assets held-for-sale	$ 0	$ 91,318
Branch liability held-for-sale	$ 0	605,111
Desert Community Bank
Long Lived Assets Held-for-sale [Line Items]
Branch liability held-for-sale		605,100
Desert Community Bank | California
Long Lived Assets Held-for-sale [Line Items]
Number of branches to be sold | banking_branch			8
Loans held-for-sale | Desert Community Bank
Long Lived Assets Held-for-sale [Line Items]
Branch assets held-for-sale		78,100
Premises and equipment held-for-sale | Desert Community Bank
Long Lived Assets Held-for-sale [Line Items]
Branch assets held-for-sale		$ 8,000

Dispositions and Held-for-Sal43

Dispositions and Held-for-Sale (Dispositions) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2017USD ($)	Mar. 17, 2018USD ($)banking_branch
Disposition [Line Items]
Net gain on sale of business	$ 0	$ 0	$ 31,470	$ 0
Desert Community Bank
Disposition [Line Items]
Net cash payment in sale of branches			499,900
Net gain on sale of business			$ 31,500
Desert Community Bank | California
Disposition [Line Items]
Number of branches sold | banking_branch					8
Loans | Desert Community Bank
Disposition [Line Items]
Branch assets sold					$ 59,100
Cash and cash equivalents | Desert Community Bank
Disposition [Line Items]
Branch assets sold					9,000
Premises and equipment | Desert Community Bank
Disposition [Line Items]
Branch assets sold					7,900
Deposits | Desert Community Bank
Disposition [Line Items]
Branch liabilities sold					$ 613,700

Fair Value Measurement and Fa44

Fair Value Measurement and Fair Value of Financial Instruments (Financial Assets and Liabilities Measurement on Recurring Basis) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment securities available-for-sale
Equity securities		$ 31,900
Derivative
Derivative assets	$ 81,456	66,146
Derivative liabilities	114,542	74,935
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)
Investment securities available-for-sale
Available-for-sale investment securities	629,270	661,015
Equity securities	20,431
Total investments in tax credit and other investments	20,431
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps and options
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange forwards, spot and swaps
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | RPAs
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity warrants
Derivative
Derivative assets	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commodity swaps and options
Derivative
Derivative assets	0
Derivative liabilities	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps
Derivative
Derivative liabilities		0
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	629,270	640,280
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | 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	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | 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	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-agency residential mortgage-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate debt securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign bonds | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0
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		20,735
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2)
Investment securities available-for-sale
Available-for-sale investment securities	2,078,174	2,355,737
Equity securities	10,498
Total investments in tax credit and other investments	10,498
Derivative
Derivative assets	80,808	65,467
Derivative liabilities	114,542	74,935
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and options
Derivative
Derivative assets	64,225	58,633
Derivative liabilities	100,025	57,958
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign exchange forwards, spot and swaps
Derivative
Derivative assets	11,724	5,840
Derivative liabilities	11,281	10,170
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | RPAs
Derivative
Derivative assets	1	1
Derivative liabilities	77	8
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Equity warrants
Derivative
Derivative assets	1,230	993
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Commodity swaps and options
Derivative
Derivative assets	3,628
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps
Derivative
Derivative liabilities		6,799
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
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	240,042	203,392
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	337,237	318,957
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	936,447	1,190,271
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	73,619	99,982
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	7,835	9,117
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	11,001	37,003
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Foreign bonds | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	459,433	486,408
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	12,560
Fair Value, Measurements, Recurring | Significant Other Observable Inputs (Level 2) | Other securities
Investment securities available-for-sale
Available-for-sale investment securities		10,607
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Equity securities	0
Total investments in tax credit and other investments	0
Derivative
Derivative assets	648	679
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swaps and options
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign exchange forwards, spot and swaps
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | RPAs
Derivative
Derivative assets	0	0
Derivative liabilities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Equity warrants
Derivative
Derivative assets	648	679
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Commodity swaps and options
Derivative
Derivative assets	0
Derivative liabilities	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swaps
Derivative
Derivative liabilities		0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | 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	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | 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	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Non-agency residential mortgage-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Corporate debt securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Foreign bonds | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	0
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3) | Other securities
Investment securities available-for-sale
Available-for-sale investment securities		0
Fair Value, Measurements, Recurring | Fair Value Measurements
Investment securities available-for-sale
Available-for-sale investment securities	2,707,444	3,016,752
Equity securities	30,929
Total investments in tax credit and other investments	30,929
Derivative
Derivative assets	81,456	66,146
Derivative liabilities	114,542	74,935
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps and options
Derivative
Derivative assets	64,225	58,633
Derivative liabilities	100,025	57,958
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign exchange forwards, spot and swaps
Derivative
Derivative assets	11,724	5,840
Derivative liabilities	11,281	10,170
Fair Value, Measurements, Recurring | Fair Value Measurements | RPAs
Derivative
Derivative assets	1	1
Derivative liabilities	77	8
Fair Value, Measurements, Recurring | Fair Value Measurements | Equity warrants
Derivative
Derivative assets	1,878	1,672
Fair Value, Measurements, Recurring | Fair Value Measurements | Commodity swaps and options
Derivative
Derivative assets	3,628
Derivative liabilities	3,159
Fair Value, Measurements, Recurring | Fair Value Measurements | Interest rate swaps
Derivative
Derivative liabilities		6,799
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. Treasury securities
Investment securities available-for-sale
Available-for-sale investment securities	629,270	640,280
Fair Value, Measurements, Recurring | Fair Value Measurements | U.S. government agency and U.S. government sponsored enterprise debt securities
Investment securities available-for-sale
Available-for-sale investment securities	240,042	203,392
Fair Value, Measurements, Recurring | Fair Value Measurements | 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	337,237	318,957
Fair Value, Measurements, Recurring | Fair Value Measurements | 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	936,447	1,190,271
Fair Value, Measurements, Recurring | Fair Value Measurements | Municipal securities
Investment securities available-for-sale
Available-for-sale investment securities	73,619	99,982
Fair Value, Measurements, Recurring | Fair Value Measurements | Non-agency residential mortgage-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	7,835	9,117
Fair Value, Measurements, Recurring | Fair Value Measurements | Corporate debt securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	11,001	37,003
Fair Value, Measurements, Recurring | Fair Value Measurements | Foreign bonds | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	459,433	486,408
Fair Value, Measurements, Recurring | Fair Value Measurements | Asset-backed securities | Investment grade
Investment securities available-for-sale
Available-for-sale investment securities	$ 12,560
Fair Value, Measurements, Recurring | Fair Value Measurements | Other securities
Investment securities available-for-sale
Available-for-sale investment securities		$ 31,342

Fair Value Measurement and Fa45

Fair Value Measurement and Fair Value of Financial Instruments (Reconciliation of Assets and Liabilities Measured on Recurring Basis) (Details) - Equity warrants - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Fair Value, Measurements, Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Roll Forward]
Beginning balance	$ 931	$ 679
Total (losses) gains for the period included in earnings	(76)	168
Issuances	26	34
Settlements	(233)	(233)
Ending balance	648	648
Ancillary loan fees and other income
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total unrealized (losses) gains for the period included in earnings	$ (13)	$ 231

Fair Value Measurement and Fa46

Fair Value Measurement and Fair Value of Financial Instruments (Quantitative Information for Significant Unobservable Inputs) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Quantitative information
Equity warrant	$ 81,456	$ 66,146
Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Quantitative information
Equity warrant	648	679
Non-PCI Loans | Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	25,135	38,188
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	25,135	38,188
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	$ 21,048	$ 22,802
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Discount	6.00%	6.00%
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Minimum
Quantitative information
Discount	4.00%	4.00%
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Discounted cash flows | Fair Value, Measurements, Nonrecurring | Maximum
Quantitative information
Discount	7.00%	10.00%
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of property | Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	$ 3,167	$ 9,773
Selling cost	8.00%	8.00%
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of property | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Selling cost	8.00%	8.00%
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	$ 318	$ 3,207
Discount	15.00%
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Discount	15.00%	29.00%
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Minimum
Quantitative information
Discount		20.00%
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, discount | Fair Value, Measurements, Nonrecurring | Maximum
Quantitative information
Discount		32.00%
Non-PCI Loans | Significant Unobservable Inputs (Level 3) | Fair value of collateral, contract value | Fair Value, Measurements, Nonrecurring
Quantitative information
Non-PCI impaired loans	$ 602	$ 2,406
OREO non-recurring fair value losses | Fair Value, Measurements, Nonrecurring
Quantitative information
OREO		9
OREO non-recurring fair value losses | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Nonrecurring
Quantitative information
OREO		9
OREO non-recurring fair value losses | Significant Unobservable Inputs (Level 3) | Fair value of property | Fair Value, Measurements, Nonrecurring
Quantitative information
OREO		$ 9
Selling cost		8.00%
OREO non-recurring fair value losses | Significant Unobservable Inputs (Level 3) | Fair value of property | Fair Value, Measurements, Nonrecurring | Weighted Average
Quantitative information
Selling cost		8.00%
Equity warrants | Significant Unobservable Inputs (Level 3) | Fair Value, Measurements, Recurring
Quantitative information
Equity warrant	$ 648	$ 679
Equity warrants | Significant Unobservable Inputs (Level 3) | Black-Scholes option pricing model | Fair Value, Measurements, Recurring | Weighted Average
Quantitative information
Volatility	47.00%
Liquidity discount	47.00%

Fair Value Measurement and Fa47

Fair Value Measurement and Fair Value of Financial Instruments (Carrying Amounts of Assets Included on the Consolidated Balance Sheets Measured on a Nonrecurring Basis) (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	$ 25,135	$ 38,188
OREO non-recurring fair value losses
Fair Value, Assets Measured on a Nonrecurring Basis
OREO		9
Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Quoted Prices in Active Markets for Identical Assets (Level 1) | OREO non-recurring fair value losses
Fair Value, Assets Measured on a Nonrecurring Basis
OREO		0
Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Significant Other Observable Inputs (Level 2) | OREO non-recurring fair value losses
Fair Value, Assets Measured on a Nonrecurring Basis
OREO		0
Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	25,135	38,188
Significant Unobservable Inputs (Level 3) | OREO non-recurring fair value losses
Fair Value, Assets Measured on a Nonrecurring Basis
OREO		9
Commercial lending | Commercial and industrial (“C&I”) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	18,574	31,404
Commercial lending | Commercial and industrial (“C&I”) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Commercial lending | Commercial and industrial (“C&I”) | Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Commercial lending | Commercial and industrial (“C&I”) | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	18,574	31,404
Commercial lending | Commercial real estate (“CRE”) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	3,053	2,667
Commercial lending | Commercial real estate (“CRE”) | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Commercial lending | Commercial real estate (“CRE”) | Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Commercial lending | Commercial real estate (“CRE”) | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	3,053	2,667
Commercial lending | Construction and land | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans		3,973
Commercial lending | Construction and land | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans		0
Commercial lending | Construction and land | Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans		0
Commercial lending | Construction and land | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans		3,973
Consumer lending | Real estate loan | Single-family | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	2,584	144
Consumer lending | Real estate loan | Single-family | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Consumer lending | Real estate loan | Single-family | Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0	0
Consumer lending | Real estate loan | Single-family | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	2,584	$ 144
Consumer lending | HELOCs | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	924
Consumer lending | HELOCs | Quoted Prices in Active Markets for Identical Assets (Level 1) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0
Consumer lending | HELOCs | Significant Other Observable Inputs (Level 2) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	0
Consumer lending | HELOCs | Significant Unobservable Inputs (Level 3) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Non-PCI impaired loans	$ 924

Fair Value Measurement and Fa48

Fair Value Measurement and Fair Value of Financial Instruments (Fair Value Adjustments of Assets Measured on a Nonrecurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets		$ (8)		$ 61
Fair Value, Measurements, Nonrecurring | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	$ 4,537	(13,873)	$ 514	(11,371)
Fair Value, Measurements, Nonrecurring | OREO non-recurring fair value losses
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	0	0	0	(285)
Fair Value, Measurements, Nonrecurring | Commercial lending | Commercial and industrial (“C&I”) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	4,544	(14,060)	595	(11,418)
Fair Value, Measurements, Nonrecurring | Commercial lending | Commercial real estate (“CRE”) | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	66	193	(23)	118
Fair Value, Measurements, Nonrecurring | Commercial lending | Real estate loan | Multifamily | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	0	(106)	0	(107)
Fair Value, Measurements, Nonrecurring | Commercial lending | Construction and land | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	0	0	0	(147)
Fair Value, Measurements, Nonrecurring | Consumer lending | Real estate loan | Single-family | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	0	76	15	158
Fair Value, Measurements, Nonrecurring | Consumer lending | HELOCs | Non-PCI impaired loans
Fair Value, Assets Measured on a Nonrecurring Basis
Fair value adjustments of assets	$ (73)	$ 24	$ (73)	$ 25

Fair Value Measurement and Fa49

Fair Value Measurement and Fair Value of Financial Instruments (Carrying and Fair Values per the Fair Value Hierarchy of Certain Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Financial assets:
Cash and cash equivalents	$ 2,297,471	$ 2,174,592	$ 2,752,476	$ 1,878,503
Interest-bearing deposits with banks	360,900	398,422
Resale agreements	975,000	1,050,000
Restricted equity securities, at cost	73,524	73,521
Loans held-for-sale	14,658	85
Loans held-for-investment, net	29,928,829	28,688,590
Branch assets held-for-sale	0	91,318
Financial liabilities:
Short-term borrowings	58,523	0
FHLB advances	325,020	323,891
Repurchase agreements	50,000	50,000
Long-term debt	161,704	171,577
Carrying amount of repurchase agreements eligible for netting against resale agreements	400,000	400,000
Gross repurchase agreements	450,000	450,000
Carrying Amount
Financial assets:
Cash and cash equivalents	2,297,471	2,174,592
Interest-bearing deposits with banks	360,900	398,422
Resale agreements	975,000	1,050,000
Restricted equity securities, at cost	73,524	73,521
Loans held-for-sale	14,658	85
Loans held-for-investment, net	29,928,829	28,688,590
Branch assets held-for-sale		91,318
Mortgage servicing rights	7,865	7,771
Accrued interest receivable	128,339	121,719
Financial liabilities:
Demand, checking, savings and money market deposits	24,916,109	25,974,314
Time deposits	7,860,023	5,640,749
Branch liability held-for-sale		605,111
Short-term borrowings	58,523
FHLB advances	325,020	323,891
Repurchase agreements	50,000	50,000
Long-term debt	161,704	171,577
Accrued interest payable	15,360	10,724
Estimated Fair Value
Financial assets:
Cash and cash equivalents	2,297,471	2,174,592
Interest-bearing deposits with banks	360,900	398,422
Resale agreements	946,643	1,035,158
Restricted equity securities, at cost	73,524	73,521
Loans held-for-sale	14,658	85
Loans held-for-investment, net	30,073,212	28,956,349
Branch assets held-for-sale		94,245
Mortgage servicing rights	12,111	11,324
Accrued interest receivable	128,339	121,719
Financial liabilities:
Demand, checking, savings and money market deposits	24,916,109	25,974,314
Time deposits	7,835,585	5,626,855
Branch liability held-for-sale		643,937
Short-term borrowings	58,523
FHLB advances	337,544	335,901
Repurchase agreements	114,944	104,830
Long-term debt	167,573	171,673
Accrued interest payable	15,360	10,724
Estimated Fair Value | Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial assets:
Cash and cash equivalents	2,297,471	2,174,592
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
Restricted equity securities, at cost	0	0
Loans held-for-sale	0	0
Loans held-for-investment, net	0	0
Branch assets held-for-sale		5,143
Mortgage servicing rights	0	0
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
Branch liability held-for-sale		0
Short-term borrowings	0
FHLB advances	0	0
Repurchase agreements	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Estimated Fair Value | Significant Other Observable Inputs (Level 2)
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	360,900	398,422
Resale agreements	946,643	1,035,158
Restricted equity securities, at cost	73,524	73,521
Loans held-for-sale	14,658	85
Loans held-for-investment, net	0	0
Branch assets held-for-sale		10,970
Mortgage servicing rights	0	0
Accrued interest receivable	128,339	121,719
Financial liabilities:
Demand, checking, savings and money market deposits	24,916,109	25,974,314
Time deposits	7,835,585	5,626,855
Branch liability held-for-sale		0
Short-term borrowings	58,523
FHLB advances	337,544	335,901
Repurchase agreements	114,944	104,830
Long-term debt	167,573	171,673
Accrued interest payable	15,360	10,724
Estimated Fair Value | Significant Unobservable Inputs (Level 3)
Financial assets:
Cash and cash equivalents	0	0
Interest-bearing deposits with banks	0	0
Resale agreements	0	0
Restricted equity securities, at cost	0	0
Loans held-for-sale	0	0
Loans held-for-investment, net	30,073,212	28,956,349
Branch assets held-for-sale		78,132
Mortgage servicing rights	12,111	11,324
Accrued interest receivable	0	0
Financial liabilities:
Demand, checking, savings and money market deposits	0	0
Time deposits	0	0
Branch liability held-for-sale		643,937
Short-term borrowings	0
FHLB advances	0	0
Repurchase agreements	0	0
Long-term debt	0	0
Accrued interest payable	$ 0	$ 0

Securities Purchased under Re50

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Resale Agreements and Repurchase Agreements) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Resale agreements
Gross resale agreements	$ 1,375,000	$ 1,450,000
Weighted average interest rates (as a percent)	2.63%	2.43%
Repurchase agreements
Gross repurchase agreements	$ 450,000	$ 450,000
Weighted average interest rates (as a percent)	4.60%	3.65%

Securities Purchased under Re51

Securities Purchased under Resale Agreements and Sold under Repurchase Agreements (Balance Sheet Offsetting) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets, Resale Agreements
Gross Amounts of Recognized Assets	$ 1,375,000	$ 1,450,000
Gross Amounts Offset on the Consolidated Balance Sheet	(400,000)	(400,000)
Net Amounts of Assets Presented on the Consolidated Balance Sheet	975,000	1,050,000
Gross Amounts Not Offset on the Consolidated Balance Sheet
Financial Instruments	0	0
Collateral Received	(966,410)	(1,045,696)
Net Amount	8,590	4,304
Liabilities, Repurchase Agreements
Gross Amounts of Recognized Liabilities	450,000	450,000
Gross Amounts Offset on the Consolidated Balance Sheet	(400,000)	(400,000)
Net Amounts of Liabilities Presented on the Consolidated Balance Sheet	50,000	50,000
Gross Amounts Not Offset on the Consolidated Balance Sheet
Financial Instruments	0	0
Collateral Pledged	(50,000)	(50,000)
Net Amount	$ 0	$ 0

Securities (Schedule of Availab

Securities (Schedule of Available-for-sale Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Available-for-sale investment securities:
Amortized Cost	$ 2,799,473	$ 3,070,067
Gross Unrealized Gains	2,185	5,013
Gross Unrealized Losses	(94,214)	(58,328)
Fair Value	2,707,444	3,016,752
U.S. Treasury securities
Available-for-sale investment securities:
Amortized Cost	648,271	651,395
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(19,001)	(11,115)
Fair Value	629,270	640,280
U.S. government agency and U.S. government sponsored enterprise debt securities
Available-for-sale investment securities:
Amortized Cost	244,688	206,815
Gross Unrealized Gains	49	62
Gross Unrealized Losses	(4,695)	(3,485)
Fair Value	240,042	203,392
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Available-for-sale investment securities:
Amortized Cost	352,547	328,348
Gross Unrealized Gains	10	141
Gross Unrealized Losses	(15,320)	(9,532)
Fair Value	337,237	318,957
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Available-for-sale investment securities:
Amortized Cost	958,173	1,199,869
Gross Unrealized Gains	1,920	3,964
Gross Unrealized Losses	(23,646)	(13,562)
Fair Value	936,447	1,190,271
Municipal securities
Available-for-sale investment securities:
Amortized Cost	74,596	99,636
Gross Unrealized Gains	206	655
Gross Unrealized Losses	(1,183)	(309)
Fair Value	73,619	99,982
Non-agency residential mortgage-backed securities | Investment grade
Available-for-sale investment securities:
Amortized Cost	8,004	9,136
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(169)	(22)
Fair Value	7,835	9,117
Corporate debt securities | Investment grade
Available-for-sale investment securities:
Amortized Cost	11,250	37,585
Gross Unrealized Gains	0	164
Gross Unrealized Losses	(249)	(746)
Fair Value	11,001	37,003
Foreign bonds | Investment grade
Available-for-sale investment securities:
Amortized Cost	489,340	505,396
Gross Unrealized Gains	0	24
Gross Unrealized Losses	(29,907)	(19,012)
Fair Value	459,433	486,408
Foreign bonds | Investment grade | Multilateral development bank
Available-for-sale investment securities:
Fair Value	445,100	456,100
Asset-backed securities | Investment grade
Available-for-sale investment securities:
Amortized Cost	12,604
Gross Unrealized Gains	0
Gross Unrealized Losses	(44)
Fair Value	$ 12,560
Other securities
Available-for-sale investment securities:
Amortized Cost		31,887
Gross Unrealized Gains		0
Gross Unrealized Losses		(545)
Fair Value		$ 31,342

Securities (Continuous Unrealiz

Securities (Continuous Unrealized Losses) (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)security	Jun. 30, 2017USD ($)	Jun. 30, 2018USD ($)security	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)security
Fair Value
Less Than 12 Months	$ 1,065,508,000		$ 1,065,508,000		$ 942,845,000
12 Months or More	1,422,572,000		1,422,572,000		1,483,868,000
Total	2,488,080,000		2,488,080,000		2,426,713,000
Gross Unrealized Losses
Less Than 12 Months	(26,582,000)		(26,582,000)		(9,919,000)
12 Months or More	(67,632,000)		(67,632,000)		(48,409,000)
Total	(94,214,000)		(94,214,000)		$ (58,328,000)
Impairment loss	$ 0	$ 0	$ 0	$ 0
Number of securities in an unrealized loss position | security	193		193		165
U.S. Treasury securities
Fair Value
Less Than 12 Months	$ 192,840,000		$ 192,840,000		$ 168,061,000
12 Months or More	436,430,000		436,430,000		472,219,000
Total	629,270,000		629,270,000		640,280,000
Gross Unrealized Losses
Less Than 12 Months	(4,227,000)		(4,227,000)		(1,005,000)
12 Months or More	(14,774,000)		(14,774,000)		(10,110,000)
Total	$ (19,001,000)		$ (19,001,000)		$ (11,115,000)
Number of securities in an unrealized loss position | security	22		22		25
U.S. government agency and U.S. government sponsored enterprise debt securities
Fair Value
Less Than 12 Months	$ 141,270,000		$ 141,270,000		$ 99,935,000
12 Months or More	86,287,000		86,287,000		85,281,000
Total	227,557,000		227,557,000		185,216,000
Gross Unrealized Losses
Less Than 12 Months	(3,667,000)		(3,667,000)		(623,000)
12 Months or More	(1,028,000)		(1,028,000)		(2,862,000)
Total	$ (4,695,000)		$ (4,695,000)		$ (3,485,000)
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	113		113		98
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Commercial mortgage-backed securities
Fair Value
Less Than 12 Months	$ 133,352,000		$ 133,352,000		$ 113,775,000
12 Months or More	189,400,000		189,400,000		191,827,000
Total	322,752,000		322,752,000		305,602,000
Gross Unrealized Losses
Less Than 12 Months	(3,911,000)		(3,911,000)		(2,071,000)
12 Months or More	(11,409,000)		(11,409,000)		(7,461,000)
Total	(15,320,000)		(15,320,000)		(9,532,000)
U.S. government agency and U.S. government sponsored enterprise mortgage-backed securities - Residential mortgage-backed securities
Fair Value
Less Than 12 Months	467,178,000		467,178,000		413,621,000
12 Months or More	317,707,000		317,707,000		361,809,000
Total	784,885,000		784,885,000		775,430,000
Gross Unrealized Losses
Less Than 12 Months	(10,405,000)		(10,405,000)		(4,205,000)
12 Months or More	(13,241,000)		(13,241,000)		(9,357,000)
Total	(23,646,000)		(23,646,000)		(13,562,000)
Municipal securities
Fair Value
Less Than 12 Months	24,453,000		24,453,000		8,490,000
12 Months or More	8,334,000		8,334,000		8,588,000
Total	32,787,000		32,787,000		17,078,000
Gross Unrealized Losses
Less Than 12 Months	(755,000)		(755,000)		(123,000)
12 Months or More	(428,000)		(428,000)		(186,000)
Total	(1,183,000)		(1,183,000)		(309,000)
Non-agency residential mortgage-backed securities | Investment grade
Fair Value
Less Than 12 Months	7,835,000		7,835,000		4,599,000
12 Months or More	0		0		0
Total	7,835,000		7,835,000		4,599,000
Gross Unrealized Losses
Less Than 12 Months	(169,000)		(169,000)		(22,000)
12 Months or More	0		0		0
Total	(169,000)		(169,000)		(22,000)
Corporate debt securities | Investment grade
Fair Value
Less Than 12 Months	9,754,000		9,754,000		0
12 Months or More	1,247,000		1,247,000		11,905,000
Total	11,001,000		11,001,000		11,905,000
Gross Unrealized Losses
Less Than 12 Months	(246,000)		(246,000)		0
12 Months or More	(3,000)		(3,000)		(746,000)
Total	(249,000)		(249,000)		(746,000)
Foreign bonds | Investment grade
Fair Value
Less Than 12 Months	76,266,000		76,266,000		103,149,000
12 Months or More	383,167,000		383,167,000		352,239,000
Total	459,433,000		459,433,000		455,388,000
Gross Unrealized Losses
Less Than 12 Months	(3,158,000)		(3,158,000)		(1,325,000)
12 Months or More	(26,749,000)		(26,749,000)		(17,687,000)
Total	$ (29,907,000)		$ (29,907,000)		$ (19,012,000)
Number of securities in an unrealized loss position | security	16		16		16
Asset-backed securities | Investment grade
Fair Value
Less Than 12 Months	$ 12,560,000		$ 12,560,000
12 Months or More	0		0
Total	12,560,000		12,560,000
Gross Unrealized Losses
Less Than 12 Months	(44,000)		(44,000)
12 Months or More	0		0
Total	$ (44,000)		$ (44,000)
Other securities
Fair Value
Less Than 12 Months					$ 31,215,000
12 Months or More					0
Total					31,215,000
Gross Unrealized Losses
Less Than 12 Months					(545,000)
12 Months or More					0
Total					$ (545,000)

Securities (Other-Than-Temporar

Securities (Other-Than-Temporary Impairment) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investment securities available-for-sale
Other Than Temporary Impairment Credit Losses Recognized in Earnings
OTTI credit losses	$ 0	$ 0	$ 0	$ 0

Securities (Realized Gains and

Securities (Realized Gains and Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]
Proceeds from sales	$ 42,085	$ 249,233	$ 256,875	$ 551,889
Gross realized gains	210	2,720	2,339	5,194
Related tax expense	$ 62	$ 1,144	$ 690	$ 2,184

Securities (Scheduled Maturitie

Securities (Scheduled Maturities of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Amortized Cost
Due within one year	$ 632,583
Due after one year through five years	697,172
Due after five years through ten years	199,008
Due after ten years	1,270,710
Total available-for-sale investment securities	2,799,473
Fair Value
Due within one year	603,002
Due after one year through five years	675,324
Due after five years through ten years	194,040
Due after ten years	1,235,078
Total available-for-sale investment securities	2,707,444	$ 3,016,752
Fair values of available-for-sale investment securities pledged	$ 436,800	$ 534,300

Securities (Restricted Equity S

Securities (Restricted Equity Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investments, Debt and Equity Securities [Abstract]
FRB stock	$ 56,274	$ 56,271
FHLB stock	17,250	17,250
Total	$ 73,524	$ 73,521

Derivatives (Notional and Fair

Derivatives (Notional and Fair Values) (Details) $ in Thousands, MMBTU in Millions, Boe in Millions	Jun. 30, 2018USD ($)MMBTUBoewarrant	Dec. 31, 2017USD ($)warrant
Fair Values of Derivative Instruments
Derivative assets	$ 81,456	$ 66,146
Derivative liabilities	114,542	74,935
Derivatives designated as hedging instruments
Fair Values of Derivative Instruments
Notional Amount	131,326	35,811
Derivative assets	2,316	0
Derivative liabilities	8,647	6,799
Derivatives designated as hedging instruments | Interest rate swaps
Fair Values of Derivative Instruments
Notional Amount	35,811	35,811
Derivative assets	0	0
Derivative liabilities	8,647	6,799
Derivatives designated as hedging instruments | Foreign exchange forwards
Fair Values of Derivative Instruments
Notional Amount	95,515	0
Derivative assets	2,316	0
Derivative liabilities	0	0
Derivatives not designated as hedging instruments
Fair Values of Derivative Instruments
Notional Amount	12,295,137	10,153,108
Derivative assets	79,140	66,146
Derivative liabilities	105,895	68,136
Derivatives not designated as hedging instruments | Interest rate swaps and options
Fair Values of Derivative Instruments
Notional Amount	11,217,468	9,333,860
Derivative assets	64,225	58,633
Derivative liabilities	91,378	57,958
Derivatives not designated as hedging instruments | Foreign exchange forwards, spot and swaps
Fair Values of Derivative Instruments
Notional Amount	959,645	770,215
Derivative assets	9,408	5,840
Derivative liabilities	11,281	10,170
Derivatives not designated as hedging instruments | RPAs
Fair Values of Derivative Instruments
Notional Amount	118,024	49,033
Derivative assets	1	1
Derivative liabilities	77	8
Derivatives not designated as hedging instruments | Equity warrants
Fair Values of Derivative Instruments
Notional Amount	0	0
Derivative assets	1,878	1,672
Derivative liabilities	$ 0	$ 0
Derivatives not designated as hedging instruments | Warrant, Public Companies
Fair Values of Derivative Instruments
Number of warrants held | warrant	4	4
Derivatives not designated as hedging instruments | Warrant, Private Companies
Fair Values of Derivative Instruments
Number of warrants held | warrant	14	11
Derivatives not designated as hedging instruments | Commodity swaps and options
Fair Values of Derivative Instruments
Notional Amount	$ 0	$ 0
Derivative assets	3,628	0
Derivative liabilities	$ 3,159	$ 0
Oil
Fair Values of Derivative Instruments
Derivative, nonmonetary notional amount | Boe	1.8
Natural gas
Fair Values of Derivative Instruments
Derivative, nonmonetary notional amount | MMBTU	5.2

Derivatives (Narrative) (Detail

Derivatives (Narrative) (Details) Boe in Thousands, MMBTU in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018USD ($)warrant	Jun. 30, 2017hedge	Jun. 30, 2018USD ($)MMBTUBoewarrant	Jun. 30, 2017USD ($)	Dec. 31, 2017USD ($)warrantcontract
Derivative [Line Items]
Derivative liabilities	$ 114,542,000		$ 114,542,000		$ 74,935,000
Derivative assets	81,456,000		81,456,000		$ 66,146,000
Number of derivative contracts designated as investment hedge | contract					0
Number of investment hedges designated and recorded | hedge		0
Derivative asset, reduction in fair value	54,315,000		54,315,000		$ 29,205,000
Derivative liability, reduction in fair value	31,577,000		31,577,000		48,203,000
Collateral posted	12,889,000		12,889,000		28,796,000
Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	131,326,000		131,326,000		35,811,000
Derivative liabilities	8,647,000		8,647,000		6,799,000
Derivative assets	2,316,000		2,316,000		0
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	12,295,137,000		12,295,137,000		10,153,108,000
Derivative liabilities	105,895,000		105,895,000		68,136,000
Derivative assets	79,140,000		79,140,000		66,146,000
Derivatives not designated as hedging instruments | Financial Counterparties
Derivative [Line Items]
Derivative liabilities	2,888		2,888
Derivative assets	0		0
Interest rate swaps | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	35,811,000		35,811,000		35,811,000
Derivative liabilities	8,647,000		8,647,000		6,799,000
Derivative assets	0		0		0
Interest rate swaps | Derivatives designated as hedging instruments | Fair Value Hedges
Derivative [Line Items]
Notional amount	35,800,000		35,800,000		35,800,000
Derivative liabilities	8,600,000		8,600,000		6,800,000
Foreign exchange forwards | Derivatives designated as hedging instruments
Derivative [Line Items]
Notional amount	95,515,000		95,515,000		0
Derivative liabilities	0		0		0
Derivative assets	2,316,000		2,316,000		0
Foreign exchange forwards | Derivatives designated as hedging instruments | Net investment hedges
Derivative [Line Items]
Notional amount	95,500,000		95,500,000
Derivative assets	2,300,000		2,300,000
Total fair value change in foreign currency translation adjustment with aoci	4,900,000		3,800,000
Gain (loss) recognized in AOCI on net investment hedges (effective portion)				$ (648,000)
(Losses) gains recognized in foreign exchange income (ineffective portion)				$ (2,000,000)
Interest rate swaps and options | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	11,217,468,000		11,217,468,000		9,333,860,000
Derivative liabilities	91,378,000		91,378,000		57,958,000
Derivative assets	64,225,000		64,225,000		58,633,000
Interest rate swaps and options | Derivatives not designated as hedging instruments | LCH
Derivative [Line Items]
Derivative asset, reduction in fair value	(32,200,000)		(32,200,000)
Derivative liability, reduction in fair value	(2,900,000)		(2,900,000)
Notional amount of derivative assets	1,550,000,000		1,550,000,000
Fair value of interest rate swaps cleared through LCH	241,000		241,000
Interest rate swaps and options | Derivatives not designated as hedging instruments | Financial Counterparties
Derivative [Line Items]
Notional amount of derivative assets	5,610,000,000		5,610,000,000
RPAs | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	118,024,000		118,024,000		49,033,000
Derivative liabilities	77,000		77,000		8,000
Derivative assets	1,000		$ 1,000		$ 1,000
Weighted average remaining maturity (in years)			6 years 8 months 12 days		6 years
RPAs | Derivatives not designated as hedging instruments | Long
Derivative [Line Items]
Notional amount	105,800,000		$ 105,800,000		$ 35,200,000
Derivative liabilities	77,000		77,000		8,000
Derivative assets	0		0		0
Interest rate derivative exposure	962,000		962,000		419,000
RPAs | Derivatives not designated as hedging instruments | Short
Derivative [Line Items]
Notional amount	12,300,000		12,300,000		13,800,000
Derivative liabilities	0		0		0
Derivative assets	1,000		1,000		1,000
Equity warrants | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	0		0		0
Derivative liabilities	0		0		0
Derivative assets	$ 1,878,000		$ 1,878,000		$ 1,672,000
Warrant, Public Companies | Derivatives not designated as hedging instruments
Derivative [Line Items]
Number of warrants held | warrant	4		4		4
Warrant, Private Companies | Derivatives not designated as hedging instruments
Derivative [Line Items]
Number of warrants held | warrant	14		14		11
Commodity swaps and options | Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	$ 0		$ 0		$ 0
Derivative liabilities	3,159,000		3,159,000		0
Derivative assets	3,628,000		3,628,000		0
Commodity swaps and options | Derivatives not designated as hedging instruments | Chicago Mercantile Exchange (CME)
Derivative [Line Items]
Derivative asset, reduction in fair value	(271,000)		(271,000)
Derivative liability, reduction in fair value	(595,000)		(595,000)
Credit-risk-related contingent features
Derivative [Line Items]
Aggregate fair value of derivative instruments in net liability position	11,400,000		11,400,000		6,300,000
Collateral posted	$ 11,300,000		$ 11,300,000		$ 6,200,000
Oil | Commodity swaps and options | Derivatives not designated as hedging instruments | Chicago Mercantile Exchange (CME)
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | Boe			264
Natural gas | Commodity swaps and options | Derivatives not designated as hedging instruments | Chicago Mercantile Exchange (CME)
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | MMBTU			5.2

Derivatives (Net Gains (Losses)

Derivatives (Net Gains (Losses) on Derivatives Designated as Hedges) (Details) - Fair Value Hedges - Derivatives designated as hedging instruments - Interest Expense - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Certificates of deposits
Derivative [Line Items]
Recognized on certificates of deposit	$ 440	$ 664	$ 1,719	$ 1,352
Interest rate swaps
Derivative [Line Items]
Recognized on interest rate swaps	$ (396)	$ (706)	$ (1,848)	$ (1,523)

Derivatives (Hedged Items Curre

Derivatives (Hedged Items Currently Designated) (Details) - Certificates of deposits - Fair Value Hedges - Interest rate swaps - Derivatives designated as hedging instruments $ in Thousands	Jun. 30, 2018USD ($)
Derivative [Line Items]
Carrying Amount of the Hedged Assets/(Liabilities)	$ (29,339)
Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets (Liabilities)	$ 6,464

Derivatives (Interest Rate Deri

Derivatives (Interest Rate Derivative Contracts) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Derivative [Line Items]
Derivative assets	$ 81,456,000	$ 66,146,000
Derivative liabilities	114,542,000	74,935,000
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	12,295,137,000	10,153,108,000
Derivative assets	79,140,000	66,146,000
Derivative liabilities	105,895,000	$ 68,136,000
Derivatives not designated as hedging instruments | Customer Counterparties
Derivative [Line Items]
Derivative assets	3,628
Derivative liabilities	271
Derivatives not designated as hedging instruments | Customer Counterparties | Written Option
Derivative [Line Items]
Notional amount	843,965,000		$ 691,548,000
Derivative assets	0		0
Derivative liabilities	696,000		223,000
Derivatives not designated as hedging instruments | Customer Counterparties | Collars and Corridors
Derivative [Line Items]
Notional amount	335,169,000		247,542,000
Derivative assets	147,000		204,000
Derivative liabilities	1,004,000		267,000
Derivatives not designated as hedging instruments | Customer Counterparties | Swaps
Derivative [Line Items]
Notional amount	4,425,902,000		3,724,295,000
Derivative assets	15,902,000		32,241,000
Derivative liabilities	76,297,000		24,879,000
Derivatives not designated as hedging instruments | Customer Counterparties | Interest rate swaps and options
Derivative [Line Items]
Notional amount	5,605,036,000		4,663,385,000
Derivative assets	16,049,000		32,445,000
Derivative liabilities	77,997,000		25,369,000
Derivatives not designated as hedging instruments | Financial Counterparties
Derivative [Line Items]
Derivative assets	0
Derivative liabilities	2,888
Derivatives not designated as hedging instruments | Financial Counterparties | Purchased Options
Derivative [Line Items]
Notional amount	843,965,000		691,548,000
Derivative assets	711,000		233,000
Derivative liabilities	0		0
Derivatives not designated as hedging instruments | Financial Counterparties | Collars and Corridors
Derivative [Line Items]
Notional amount	335,169,000		247,542,000
Derivative assets	1,015,000		271,000
Derivative liabilities	147,000		211,000
Derivatives not designated as hedging instruments | Financial Counterparties | Swaps
Derivative [Line Items]
Notional amount	4,433,298,000		3,731,385,000
Derivative assets	46,450,000		25,684,000
Derivative liabilities	13,234,000		32,378,000
Derivatives not designated as hedging instruments | Financial Counterparties | Interest rate swaps and options
Derivative [Line Items]
Notional amount	5,612,432,000		4,670,475,000
Derivative assets	48,176,000		26,188,000
Derivative liabilities	$ 13,381,000		$ 32,589,000

Derivatives (Foreign Exchange D

Derivatives (Foreign Exchange Derivative) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative assets	$ 81,456,000	$ 66,146,000
Derivative liabilities	114,542,000	74,935,000
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional Amount	12,295,137,000	10,153,108,000
Derivative assets	79,140,000	66,146,000
Derivative liabilities	105,895,000	68,136,000
Derivatives not designated as hedging instruments | Foreign exchange forwards, spot and swaps
Derivative [Line Items]
Notional Amount	959,645,000	770,215,000
Derivative assets	9,408,000	5,840,000
Derivative liabilities	11,281,000	10,170,000
Derivatives not designated as hedging instruments | Customer Counterparties
Derivative [Line Items]
Derivative assets	3,628
Derivative liabilities	271
Derivatives not designated as hedging instruments | Customer Counterparties | Foreign exchange forwards, spot and swaps
Derivative [Line Items]
Notional Amount	372,470,000	167,707,000
Derivative assets	5,300,000	2,189,000
Derivative liabilities	4,652,000	850,000
Derivatives not designated as hedging instruments | Customer Counterparties | Forwards and spot
Derivative [Line Items]
Notional Amount	353,439,000	163,389,000
Derivative assets	5,298,000	2,189,000
Derivative liabilities	3,778,000	752,000
Derivatives not designated as hedging instruments | Customer Counterparties | Swaps
Derivative [Line Items]
Notional Amount	19,031,000	4,318,000
Derivative assets	2,000	0
Derivative liabilities	874,000	98,000
Derivatives not designated as hedging instruments | Financial Counterparties
Derivative [Line Items]
Derivative assets	0
Derivative liabilities	2,888
Derivatives not designated as hedging instruments | Financial Counterparties | Foreign exchange forwards, spot and swaps
Derivative [Line Items]
Notional Amount	587,175,000	602,508,000
Derivative assets	4,108,000	3,651,000
Derivative liabilities	6,629,000	9,320,000
Derivatives not designated as hedging instruments | Financial Counterparties | Forwards and spot
Derivative [Line Items]
Notional Amount	77,152,000	155,872,000
Derivative assets	47,000	662,000
Derivative liabilities	462,000	7,800,000
Derivatives not designated as hedging instruments | Financial Counterparties | Swaps
Derivative [Line Items]
Notional Amount	510,023,000	446,636,000
Derivative assets	4,061,000	2,989,000
Derivative liabilities	$ 6,167,000	$ 1,520,000

Derivatives (Risk Participation

Derivatives (Risk Participation Agreement) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivative [Line Items]
Derivative liabilities	$ 114,542	$ 74,935
Derivative assets	81,456	66,146
Derivatives not designated as hedging instruments
Derivative [Line Items]
Notional amount	12,295,137	10,153,108
Derivative liabilities	105,895	68,136
Derivative assets	79,140	66,146
Derivatives not designated as hedging instruments | RPAs
Derivative [Line Items]
Notional amount	118,024	49,033
Derivative liabilities	77	8
Derivative assets	1	1
Derivatives not designated as hedging instruments | RPAs | Long
Derivative [Line Items]
Notional amount	105,800	35,200
Derivative liabilities	77	8
Derivative assets	0	0
Derivatives not designated as hedging instruments | RPAs | Short
Derivative [Line Items]
Notional amount	12,300	13,800
Derivative liabilities	0	0
Derivative assets	$ 1	$ 1

Derivatives (Commodity Derivati

Derivatives (Commodity Derivative Positions) (Details) MMBTU in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)MMBTUBoe	Dec. 31, 2017USD ($)	Jun. 30, 2017USD ($)
Derivative [Line Items]
Derivative assets	$ 81,456,000	$ 66,146,000
Derivative liabilities	114,542,000	74,935,000
Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets	79,140,000	66,146,000
Derivative liabilities	105,895,000	68,136,000
Derivatives not designated as hedging instruments | Commodity swaps and options
Derivative [Line Items]
Derivative assets	3,628,000	0
Derivative liabilities	3,159,000	$ 0
Customer Counterparties | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets	3,628
Derivative liabilities	271
Customer Counterparties | Derivatives not designated as hedging instruments | Written Option
Derivative [Line Items]
Derivative assets	0		$ 0
Derivative liabilities	696,000		223,000
Customer Counterparties | Derivatives not designated as hedging instruments | Swaps
Derivative [Line Items]
Derivative assets	15,902,000		32,241,000
Derivative liabilities	$ 76,297,000		24,879,000
Customer Counterparties | Derivatives not designated as hedging instruments | Crude oil | Written Option
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | Boe	736,500
Derivative assets	$ 576
Derivative liabilities	$ 271
Customer Counterparties | Derivatives not designated as hedging instruments | Crude oil | Collars
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | Boe	812,100
Derivative assets	$ 1,720
Derivative liabilities	$ 0
Customer Counterparties | Derivatives not designated as hedging instruments | Crude oil | Swaps
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | Boe	292,811
Derivative assets	$ 925
Derivative liabilities	$ 0
Customer Counterparties | Derivatives not designated as hedging instruments | Crude oil | Commodity swaps and options
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | Boe	1,841,411
Derivative assets	$ 3,221
Derivative liabilities	$ 271
Customer Counterparties | Derivatives not designated as hedging instruments | Natural gas | Collars
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | MMBTU	1,540
Derivative assets	$ 85
Derivative liabilities	$ 0
Customer Counterparties | Derivatives not designated as hedging instruments | Natural gas | Swaps
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | MMBTU	3,650
Derivative assets	$ 322
Derivative liabilities	$ 0
Customer Counterparties | Derivatives not designated as hedging instruments | Natural gas | Commodity swaps and options
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | MMBTU	5,190
Derivative assets	$ 407
Derivative liabilities	0
Financial Counterparties | Derivatives not designated as hedging instruments
Derivative [Line Items]
Derivative assets	0
Derivative liabilities	2,888
Financial Counterparties | Derivatives not designated as hedging instruments | Purchased Options
Derivative [Line Items]
Derivative assets	711,000		233,000
Derivative liabilities	0		0
Financial Counterparties | Derivatives not designated as hedging instruments | Swaps
Derivative [Line Items]
Derivative assets	46,450,000		25,684,000
Derivative liabilities	$ 13,234,000		$ 32,378,000
Financial Counterparties | Derivatives not designated as hedging instruments | Crude oil | Purchased Options
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | Boe	736,500
Derivative assets	$ 0
Derivative liabilities	$ 510
Financial Counterparties | Derivatives not designated as hedging instruments | Crude oil | Collars
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | Boe	812,100
Derivative assets	$ 0
Derivative liabilities	$ 1,499
Financial Counterparties | Derivatives not designated as hedging instruments | Crude oil | Swaps
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | Boe	292,811
Derivative assets	$ 0
Derivative liabilities	$ 863
Financial Counterparties | Derivatives not designated as hedging instruments | Crude oil | Commodity swaps and options
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | Boe	1,841,411
Derivative assets	$ 0
Derivative liabilities	$ 2,872
Financial Counterparties | Derivatives not designated as hedging instruments | Natural gas | Collars
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | MMBTU	1,540
Derivative assets	$ 0
Derivative liabilities	$ 4
Financial Counterparties | Derivatives not designated as hedging instruments | Natural gas | Swaps
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | MMBTU	3,650
Derivative assets	$ 0
Derivative liabilities	$ 12
Financial Counterparties | Derivatives not designated as hedging instruments | Natural gas | Commodity swaps and options
Derivative [Line Items]
Notional amount of commodity contracts in number of barrels of oil and gas | MMBTU	5,190
Derivative assets	$ 0
Derivative liabilities	$ 16

Derivatives (Net Gains (Losse66

Derivatives (Net Gains (Losses) on Derivatives Not Designated as Hedging Instruments) (Details) - Derivatives not designated as hedging instruments - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	$ 3,316	$ 8,486	$ 8,107	$ 13,259
Interest rate swaps and options | Derivatives fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	88	(678)	1,194	(1,744)
Foreign exchange spot and forwards | Letters of credit fees and foreign exchange income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	2,646	8,378	6,503	14,216
RPAs | Derivatives fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	(56)	0	(69)	1
Equity warrants | Ancillary loan fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	598	786	439	786
Commodity swaps and options | Derivatives fees and other income
Derivative Instruments, Gain (Loss) [Line Items]
Net gains (losses) recognized for derivative not designated as hedging instruments	$ 40	$ 0	$ 40	$ 0

Derivatives (Offsetting of Deri

Derivatives (Offsetting of Derivatives) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Derivatives Assets
Total Gross Amounts	$ 81,456	$ 66,146
Gross Amounts of Contracts Not Subject to Master Netting Arrangements	27,141	36,941
Gross Amounts of Contracts Subject to Master Netting Arrangements	54,315	29,205
Gross Amounts Offset on the Consolidated Balance Sheet	0	0
Net Amounts Presented on the Consolidated Balance Sheet	54,315	29,205
Gross Amounts Not Offset on the Consolidated Balance Sheet
Derivative Amount	(18,672)	(18,955)
Collateral Received	(33,615)	(9,839)
Net Amount	2,028	411
Cash collateral received	10,100	8,600
Derivatives Liabilities
Total Gross Amounts	114,542	74,935
Gross Amounts of Contracts Not Subject to Master Netting Arrangements	82,965	26,732
Gross Amounts of Contracts Subject to Master Netting Arrangements	31,577	48,203
Gross Amounts Offset on the Consolidated Balance Sheet	0	0
Net Amounts Presented on the Consolidated Balance Sheet	31,577	48,203
Gross Amounts Not Offset on the Consolidated Balance Sheet
Derivative Amounts	(18,672)	(18,955)
Collateral Pledged	(12,889)	(28,796)
Net Amount	16	452
Cash collateral posted	$ 4,100	$ 10,700

Loans Receivable and Allowanc68

Loans Receivable and Allowance for Credit Losses (Composition of Non-PCI and PCI Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	$ 30,230,379	$ 28,975,718
Allowance for loan losses	(301,550)	(287,128)
Loans held-for-investment, net	29,928,829	28,688,590
Commercial lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	22,769,945	22,210,001
Commercial lending | Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	11,059,019	10,697,231
Commercial lending | Commercial real estate (“CRE”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	9,054,567	8,936,897
Commercial lending | Real estate loan | Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	2,032,522	1,916,176
Commercial lending | Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	623,837	659,697
Consumer lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	7,460,434	6,765,717
Consumer lending | Real estate loan | Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	5,316,895	4,646,289
Consumer lending | HELOCs
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	1,769,511	1,782,924
Consumer lending | Other consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	374,028	336,504
PCI Loans
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	383,685	482,287
Allowance for loan losses	(39)	(58)
Loans held-for-investment, net	383,646	482,229
Discount related to ASC 310-30	26,800	35,300
PCI Loans | Commercial lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	265,386	350,902
PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	2,794	11,795
PCI Loans | Commercial lending | Commercial real estate (“CRE”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	218,491	277,688
PCI Loans | Commercial lending | Real estate loan | Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	44,058	61,048
PCI Loans | Commercial lending | Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	43	371
PCI Loans | Consumer lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	118,299	131,385
PCI Loans | Consumer lending | Real estate loan | Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	106,881	117,378
PCI Loans | Consumer lending | HELOCs
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	11,418	14,007
PCI Loans | Consumer lending | Other consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	0	0
Non-PCI Loans
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	29,846,694	28,493,431
Allowance for loan losses	(301,511)	(287,070)
Loans held-for-investment, net	29,545,183	28,206,361
Net deferred loan fees, unearned fees, unamortized premiums and unaccreted discounts	(40,400)	(34,000)
Non-PCI Loans | Commercial lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	22,504,559	21,859,099
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	11,056,225	10,685,436
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	8,836,076	8,659,209
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	1,988,464	1,855,128
Non-PCI Loans | Commercial lending | Construction and land
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	623,794	659,326
Non-PCI Loans | Consumer lending
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	7,342,135	6,634,332
Non-PCI Loans | Consumer lending | Real estate loan | Single-family
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	5,210,014	4,528,911
Non-PCI Loans | Consumer lending | HELOCs
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	1,758,093	1,768,917
Non-PCI Loans | Consumer lending | Other consumer
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment	$ 374,028	$ 336,504

Loans Receivable and Allowanc69

Loans Receivable and Allowance for Credit Losses (Composition of Non-PCI and PCI Loans - Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2018USD ($)property_unit	Dec. 31, 2017USD ($)
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-investment pledged as collateral | $	$ 19,634,818	$ 18,880,598
Consumer lending | Single-family residential and home equity line of credit
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loan-to-value ratio (or less at origination)	60.00%
Multifamily | Commercial lending | Minimum
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Number of units secured by smaller multifamily properties	5
Multifamily | Commercial lending | Maximum
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Number of units secured by smaller multifamily properties	15

Loans Receivable and Allowanc70

Loans Receivable and Allowance for Credit Losses (Credit Risk Ratings for Non-PCI Loans by Portfolio Segment) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	$ 30,230,379	$ 28,975,718
Commercial lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	22,769,945	22,210,001
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	11,059,019	10,697,231
Commercial lending | Commercial real estate (“CRE”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	9,054,567	8,936,897
Commercial lending | Real estate loan | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	2,032,522	1,916,176
Commercial lending | Construction and land
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	623,837	659,697
Consumer lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	7,460,434	6,765,717
Consumer lending | Real estate loan | Single-family
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	5,316,895	4,646,289
Consumer lending | HELOCs
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,769,511	1,782,924
Consumer lending | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	374,028	336,504
Non-PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	29,846,694	28,493,431
Non-PCI Loans | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	29,297,366	27,878,020
Non-PCI Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	250,004	213,490
Non-PCI Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	298,033	381,039
Non-PCI Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,291	20,882
Non-PCI Loans | Commercial lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	22,504,559	21,859,099
Non-PCI Loans | Commercial lending | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	21,983,211	21,308,550
Non-PCI Loans | Commercial lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	244,746	184,975
Non-PCI Loans | Commercial lending | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	275,311	344,692
Non-PCI Loans | Commercial lending | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,291	20,882
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	11,056,225	10,685,436
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	10,760,675	10,369,516
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	180,741	114,769
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	113,518	180,269
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,291	20,882
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	8,836,076	8,659,209
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	8,672,374	8,484,635
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	63,315	65,616
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	100,387	108,958
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,988,464	1,855,128
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,978,241	1,839,958
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	10,223	15,170
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans | Commercial lending | Construction and land
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	623,794	659,326
Non-PCI Loans | Commercial lending | Construction and land | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	571,921	614,441
Non-PCI Loans | Commercial lending | Construction and land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	690	4,590
Non-PCI Loans | Commercial lending | Construction and land | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	51,183	40,295
Non-PCI Loans | Commercial lending | Construction and land | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans | Consumer lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	7,342,135	6,634,332
Non-PCI Loans | Consumer lending | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	7,314,155	6,569,470
Non-PCI Loans | Consumer lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	5,258	28,515
Non-PCI Loans | Consumer lending | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	22,722	36,347
Non-PCI Loans | Consumer lending | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans | Consumer lending | Real estate loan | Single-family
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	5,210,014	4,528,911
Non-PCI Loans | Consumer lending | Real estate loan | Single-family | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	5,193,906	4,490,672
Non-PCI Loans | Consumer lending | Real estate loan | Single-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	4,063	16,504
Non-PCI Loans | Consumer lending | Real estate loan | Single-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	12,045	21,735
Non-PCI Loans | Consumer lending | Real estate loan | Single-family | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans | Consumer lending | HELOCs
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,758,093	1,768,917
Non-PCI Loans | Consumer lending | HELOCs | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,748,719	1,744,903
Non-PCI Loans | Consumer lending | HELOCs | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,188	11,900
Non-PCI Loans | Consumer lending | HELOCs | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	8,186	12,114
Non-PCI Loans | Consumer lending | HELOCs | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
Non-PCI Loans | Consumer lending | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	374,028	336,504
Non-PCI Loans | Consumer lending | Other consumer | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	371,530	333,895
Non-PCI Loans | Consumer lending | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	7	111
Non-PCI Loans | Consumer lending | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	2,491	2,498
Non-PCI Loans | Consumer lending | Other consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	383,685	482,287
PCI Loans | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	349,007	432,628
PCI Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	5,297	2,131
PCI Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	29,381	47,528
PCI Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans | Commercial lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	265,386	350,902
PCI Loans | Commercial lending | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	233,083	306,081
PCI Loans | Commercial lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	4,813	588
PCI Loans | Commercial lending | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	27,490	44,233
PCI Loans | Commercial lending | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	2,794	11,795
PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	2,551	10,712
PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	57
PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	243	1,026
PCI Loans | Commercial lending | Commercial and industrial (“C&I”) | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans | Commercial lending | Commercial real estate (“CRE”)
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	218,491	277,688
PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	189,307	238,605
PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	4,813	531
PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	24,371	38,552
PCI Loans | Commercial lending | Commercial real estate (“CRE”) | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans | Commercial lending | Real estate loan | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	44,058	61,048
PCI Loans | Commercial lending | Real estate loan | Multifamily | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	41,182	56,720
PCI Loans | Commercial lending | Real estate loan | Multifamily | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans | Commercial lending | Real estate loan | Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	2,876	4,328
PCI Loans | Commercial lending | Real estate loan | Multifamily | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans | Commercial lending | Construction and land
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	43	371
PCI Loans | Commercial lending | Construction and land | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	43	44
PCI Loans | Commercial lending | Construction and land | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans | Commercial lending | Construction and land | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	327
PCI Loans | Commercial lending | Construction and land | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans | Consumer lending
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	118,299	131,385
PCI Loans | Consumer lending | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	115,924	126,547
PCI Loans | Consumer lending | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	484	1,543
PCI Loans | Consumer lending | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,891	3,295
PCI Loans | Consumer lending | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans | Consumer lending | Real estate loan | Single-family
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	106,881	117,378
PCI Loans | Consumer lending | Real estate loan | Single-family | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	105,219	113,905
PCI Loans | Consumer lending | Real estate loan | Single-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	275	1,543
PCI Loans | Consumer lending | Real estate loan | Single-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	1,387	1,930
PCI Loans | Consumer lending | Real estate loan | Single-family | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans | Consumer lending | HELOCs
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	11,418	14,007
PCI Loans | Consumer lending | HELOCs | Pass/Watch
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	10,705	12,642
PCI Loans | Consumer lending | HELOCs | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	209	0
PCI Loans | Consumer lending | HELOCs | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	504	1,365
PCI Loans | Consumer lending | HELOCs | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	0	0
PCI Loans | Consumer lending | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans held-for-investment	$ 0	$ 0

Loans Receivable and Allowanc71

Loans Receivable and Allowance for Credit Losses (Aging Analysis on Non-PCI Loans) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Nonaccrual and Past Due Loans
Number of days beyond loan classified nonaccrual	90 days
Total loans	$ 30,230,379	$ 28,975,718
Commercial lending
Nonaccrual and Past Due Loans
Total loans	22,769,945	22,210,001
Commercial lending | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total loans	11,059,019	10,697,231
Commercial lending | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total loans	9,054,567	8,936,897
Commercial lending | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total loans	2,032,522	1,916,176
Commercial lending | Construction and land
Nonaccrual and Past Due Loans
Total loans	623,837	659,697
Consumer lending
Nonaccrual and Past Due Loans
Total loans	7,460,434	6,765,717
Consumer lending | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total loans	5,316,895	4,646,289
Consumer lending | HELOCs
Nonaccrual and Past Due Loans
Total loans	1,769,511	1,782,924
Consumer lending | Other consumer
Nonaccrual and Past Due Loans
Total loans	374,028	336,504
Non-PCI Loans
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	122,402	67,677
Total Nonaccrual Loans	102,823	114,309
Current Accruing Loans	29,621,469	28,311,445
Total loans	29,846,694	28,493,431
Non-PCI Loans | Accruing Loans 30-59 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	115,987	57,551
Non-PCI Loans | Accruing Loans 60-89 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	6,415	10,126
Non-PCI Loans | Nonaccrual Loans 90 or More Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	64,447	79,958
Non-PCI Loans | Nonaccrual Loans Less Than 90 Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	38,376	34,351
Non-PCI Loans | Commercial lending
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	91,792	40,544
Total Nonaccrual Loans	84,572	101,889
Current Accruing Loans	22,328,195	21,716,666
Total loans	22,504,559	21,859,099
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	86,965	31,046
Total Nonaccrual Loans	57,097	69,213
Current Accruing Loans	10,912,163	10,585,177
Total loans	11,056,225	10,685,436
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,913	3,880
Total Nonaccrual Loans	25,748	26,986
Current Accruing Loans	8,807,415	8,628,343
Total loans	8,836,076	8,659,209
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,914	4,860
Total Nonaccrual Loans	1,727	1,717
Current Accruing Loans	1,984,823	1,848,551
Total loans	1,988,464	1,855,128
Non-PCI Loans | Commercial lending | Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	758
Total Nonaccrual Loans	0	3,973
Current Accruing Loans	623,794	654,595
Total loans	623,794	659,326
Non-PCI Loans | Commercial lending | Accruing Loans 30-59 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	91,250	39,982
Non-PCI Loans | Commercial lending | Accruing Loans 30-59 Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	86,959	30,964
Non-PCI Loans | Commercial lending | Accruing Loans 30-59 Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	2,913	3,414
Non-PCI Loans | Commercial lending | Accruing Loans 30-59 Days Past Due | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,378	4,846
Non-PCI Loans | Commercial lending | Accruing Loans 30-59 Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	758
Non-PCI Loans | Commercial lending | Accruing Loans 60-89 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	542	562
Non-PCI Loans | Commercial lending | Accruing Loans 60-89 Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	6	82
Non-PCI Loans | Commercial lending | Accruing Loans 60-89 Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	466
Non-PCI Loans | Commercial lending | Accruing Loans 60-89 Days Past Due | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	536	14
Non-PCI Loans | Commercial lending | Accruing Loans 60-89 Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	0	0
Non-PCI Loans | Commercial lending | Nonaccrual Loans 90 or More Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	48,503	67,633
Non-PCI Loans | Commercial lending | Nonaccrual Loans 90 or More Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	28,606	41,805
Non-PCI Loans | Commercial lending | Nonaccrual Loans 90 or More Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	19,897	21,556
Non-PCI Loans | Commercial lending | Nonaccrual Loans 90 or More Days Past Due | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	299
Non-PCI Loans | Commercial lending | Nonaccrual Loans 90 or More Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	3,973
Non-PCI Loans | Commercial lending | Nonaccrual Loans Less Than 90 Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	36,069	34,256
Non-PCI Loans | Commercial lending | Nonaccrual Loans Less Than 90 Days Past Due | Commercial and industrial (“C&I”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	28,491	27,408
Non-PCI Loans | Commercial lending | Nonaccrual Loans Less Than 90 Days Past Due | Commercial real estate (“CRE”)
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	5,851	5,430
Non-PCI Loans | Commercial lending | Nonaccrual Loans Less Than 90 Days Past Due | Real estate loan | Multifamily
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	1,727	1,418
Non-PCI Loans | Commercial lending | Nonaccrual Loans Less Than 90 Days Past Due | Construction and land
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	0	0
Non-PCI Loans | Consumer lending
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	30,610	27,133
Total Nonaccrual Loans	18,251	12,420
Current Accruing Loans	7,293,274	6,594,779
Total loans	7,342,135	6,634,332
Non-PCI Loans | Consumer lending | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	23,377	18,624
Total Nonaccrual Loans	7,625	5,923
Current Accruing Loans	5,179,012	4,504,364
Total loans	5,210,014	4,528,911
Non-PCI Loans | Consumer lending | HELOCs
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7,206	8,472
Total Nonaccrual Loans	8,135	4,006
Current Accruing Loans	1,742,752	1,756,439
Total loans	1,758,093	1,768,917
Non-PCI Loans | Consumer lending | Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	27	37
Total Nonaccrual Loans	2,491	2,491
Current Accruing Loans	371,510	333,976
Total loans	374,028	336,504
Non-PCI Loans | Consumer lending | Accruing Loans 30-59 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	24,737	17,569
Non-PCI Loans | Consumer lending | Accruing Loans 30-59 Days Past Due | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	18,699	13,269
Non-PCI Loans | Consumer lending | Accruing Loans 30-59 Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	6,018	4,286
Non-PCI Loans | Consumer lending | Accruing Loans 30-59 Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	20	14
Non-PCI Loans | Consumer lending | Accruing Loans 60-89 Days Past Due
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	5,873	9,564
Non-PCI Loans | Consumer lending | Accruing Loans 60-89 Days Past Due | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	4,678	5,355
Non-PCI Loans | Consumer lending | Accruing Loans 60-89 Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	1,188	4,186
Non-PCI Loans | Consumer lending | Accruing Loans 60-89 Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Accruing Past Due Loans	7	23
Non-PCI Loans | Consumer lending | Nonaccrual Loans 90 or More Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	15,944	12,325
Non-PCI Loans | Consumer lending | Nonaccrual Loans 90 or More Days Past Due | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	7,207	5,917
Non-PCI Loans | Consumer lending | Nonaccrual Loans 90 or More Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	6,246	3,917
Non-PCI Loans | Consumer lending | Nonaccrual Loans 90 or More Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	2,491	2,491
Non-PCI Loans | Consumer lending | Nonaccrual Loans Less Than 90 Days Past Due
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	2,307	95
Non-PCI Loans | Consumer lending | Nonaccrual Loans Less Than 90 Days Past Due | Real estate loan | Single-family
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	418	6
Non-PCI Loans | Consumer lending | Nonaccrual Loans Less Than 90 Days Past Due | HELOCs
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	1,889	89
Non-PCI Loans | Consumer lending | Nonaccrual Loans Less Than 90 Days Past Due | Other consumer
Nonaccrual and Past Due Loans
Total Nonaccrual Loans	$ 0	$ 0

Loans Receivable and Allowanc72

Loans Receivable and Allowance for Credit Losses (Narrative) (Details) - USD ($)	Jun. 30, 2018	Dec. 31, 2017
Loans in process of foreclosure
Other real estate owned, net	$ 709,000	$ 830,000
Residential real estate properties
Loans in process of foreclosure
Carrying amount of foreclosed residential real estate properties included in total net OREO	0	188,000
Single-family residential and home equity line of credit
Loans in process of foreclosure
Recorded investment in consumer mortgage loans secured by residential real estate properties for which formal foreclosure proceedings were in process	5,600,000	6,600,000
PCI Loans
Nonaccrual loans
Loans on nonaccrual status	$ 6,300,000	$ 5,300,000

Loans Receivable and Allowanc73

Loans Receivable and Allowance for Credit Losses (Additions to Non-PCI TDRs) (Details) - Non-PCI Loans $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)loan	Jun. 30, 2017USD ($)loan	Jun. 30, 2018USD ($)loan	Jun. 30, 2017USD ($)loan
Loans Modified as TDRs
Post- Modification Outstanding Recorded Investment	$ 2,777	$ 19,311	$ 2,777	$ 22,404
Commercial lending
Loans Modified as TDRs
Post- Modification Outstanding Recorded Investment	$ 837	$ 19,311	$ 837	$ 22,404
Commercial lending | Commercial and industrial (“C&I”)
Loans Modified as TDRs
Number of Loans | loan	0	6	0	8
Pre- Modification Outstanding Recorded Investment	$ 0	$ 17,039	$ 0	$ 18,189
Post- Modification Outstanding Recorded Investment	0	15,673	0	17,272
Financial Impact	$ 0	$ 10,010	$ 0	$ 11,202
Commercial lending | Commercial real estate (“CRE”)
Loans Modified as TDRs
Number of Loans | loan	1	0	1	1
Pre- Modification Outstanding Recorded Investment	$ 750	$ 0	$ 750	$ 1,527
Post- Modification Outstanding Recorded Investment	837	0	837	1,494
Financial Impact	$ 0	$ 0	$ 0	$ 0
Commercial lending | Real estate loan | Multifamily
Loans Modified as TDRs
Number of Loans | loan	0	1	0	1
Pre- Modification Outstanding Recorded Investment	$ 0	$ 3,655	$ 0	$ 3,655
Post- Modification Outstanding Recorded Investment	0	3,638	0	3,638
Financial Impact	0	107	0	107
Consumer lending
Loans Modified as TDRs
Post- Modification Outstanding Recorded Investment	$ 1,940	$ 0	$ 1,940	$ 0
Consumer lending | Real estate loan | Single-family
Loans Modified as TDRs
Number of Loans | loan	2	0	2	0
Pre- Modification Outstanding Recorded Investment	$ 405	$ 0	$ 405	$ 0
Post- Modification Outstanding Recorded Investment	404	0	404	0
Financial Impact	$ (26)	$ 0	$ (26)	$ 0
Consumer lending | HELOCs
Loans Modified as TDRs
Number of Loans | loan	2	0	2	0
Pre- Modification Outstanding Recorded Investment	$ 1,546	$ 0	$ 1,546	$ 0
Post- Modification Outstanding Recorded Investment	1,536	0	1,536	0
Financial Impact	$ 0	$ 0	$ 0	$ 0

Loans Receivable and Allowanc74

Loans Receivable and Allowance for Credit Losses (Non-PCI TDR Modifications) (Details) - Non-PCI Loans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	$ 2,777	$ 19,311	$ 2,777	$ 22,404
Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,529	7,026	1,529	8,520
Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	12,285	0	13,884
Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	837	0	837	6,722
Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	411	0	411	0
Commercial lending
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	837	19,311	837	22,404
Commercial lending | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	7,026	0	8,520
Commercial lending | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	12,285	0	13,884
Commercial lending | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	837	0	837	0
Commercial lending | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Commercial and industrial (“C&I”)
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	15,673	0	17,272
Commercial lending | Commercial and industrial (“C&I”) | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	3,388	0	3,388
Commercial lending | Commercial and industrial (“C&I”) | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	12,285	0	13,884
Commercial lending | Commercial and industrial (“C&I”) | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Commercial and industrial (“C&I”) | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Commercial real estate (“CRE”)
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	837	0	837	1,494
Commercial lending | Commercial real estate (“CRE”) | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	1,494
Commercial lending | Commercial real estate (“CRE”) | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Commercial real estate (“CRE”) | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	837	0	837	0
Commercial lending | Commercial real estate (“CRE”) | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Real estate loan | Multifamily
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	3,638	0	3,638
Commercial lending | Real estate loan | Multifamily | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	3,638	0	3,638
Commercial lending | Real estate loan | Multifamily | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Real estate loan | Multifamily | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Commercial lending | Real estate loan | Multifamily | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,940	0	1,940	0
Consumer lending | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,529	0	1,529	0
Consumer lending | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	846
Consumer lending | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	411	0	411	0
Consumer lending | Real estate loan | Single-family
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	404	0	404	0
Consumer lending | Real estate loan | Single-family | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	65	0	65	0
Consumer lending | Real estate loan | Single-family | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending | Real estate loan | Single-family | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending | Real estate loan | Single-family | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	339	0	339	0
Consumer lending | HELOCs
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,536	0	1,536	0
Consumer lending | HELOCs | Principal
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	1,464	0	1,464	0
Consumer lending | HELOCs | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending | HELOCs | Contractual Interest Rate Reduction [Member]
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	0	0	0	0
Consumer lending | HELOCs | Other Modifications
Financing Receivable, Modifications [Line Items]
Post- Modification Outstanding Recorded Investment	$ 72	$ 0	$ 72	$ 0

Loans Receivable and Allowanc75

Loans Receivable and Allowance for Credit Losses (Loans Modified as TDRs that Subsequently Defaulted) (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018USD ($)loan	Jun. 30, 2017USD ($)loan	Jun. 30, 2018USD ($)loan	Jun. 30, 2017USD ($)loan	Dec. 31, 2017USD ($)
Financing Receivable, Modifications [Line Items]
Period beyond which a TDR generally becomes delinquent			90 days
Additional funds committed to lend to borrowers whose terms have been modified	$ 2,900		$ 2,900		$ 5,100
Non-PCI Loans | Consumer lending | HELOCs
Financing Receivable, Modifications [Line Items]
Number of Loans | loan	0	1	0	1
Recorded Investment	$ 0	$ 48	$ 0	$ 48

Loans Receivable and Allowanc76

Loans Receivable and Allowance for Credit Losses (Non-PCI Impaired Loans) (Details) - Non-PCI Loans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Impaired loans disclosures
Unpaid Principal Balance	$ 160,346		$ 160,346		$ 211,442
Recorded Investment With No Allowance	65,602		65,602		79,064
Recorded Investment With Allowance	64,189		64,189		91,823
Total Recorded Investment	129,791		129,791		170,887
Related Allowance	14,161		14,161		19,895
Average Recorded Investment	133,982	$ 190,415	134,323	$ 196,665
Recognized Interest Income	2,689	302	5,296	696
Commercial lending
Impaired loans disclosures
Unpaid Principal Balance	131,104		131,104		187,966
Recorded Investment With No Allowance	57,072		57,072		76,777
Recorded Investment With Allowance	44,830		44,830		72,073
Total Recorded Investment	101,902		101,902		148,850
Related Allowance	11,539		11,539		16,866
Average Recorded Investment	106,027	168,889	106,306	175,079
Recognized Interest Income	2,389	254	4,686	571
Commercial lending | Commercial and industrial (“C&I”)
Impaired loans disclosures
Unpaid Principal Balance	85,975		85,975		130,773
Recorded Investment With No Allowance	27,397		27,397		36,086
Recorded Investment With Allowance	36,257		36,257		62,599
Total Recorded Investment	63,654		63,654		98,685
Related Allowance	10,920		10,920		16,094
Average Recorded Investment	67,342	113,858	67,290	119,608
Recognized Interest Income	1,494	140	2,893	362
Commercial lending | Commercial real estate (“CRE”)
Impaired loans disclosures
Unpaid Principal Balance	38,567		38,567		41,248
Recorded Investment With No Allowance	26,677		26,677		28,699
Recorded Investment With Allowance	5,469		5,469		6,857
Total Recorded Investment	32,146		32,146		35,556
Related Allowance	520		520		684
Average Recorded Investment	32,524	37,897	32,813	38,116
Recognized Interest Income	837	33	1,666	80
Commercial lending | Real estate loan | Multifamily
Impaired loans disclosures
Unpaid Principal Balance	6,562		6,562		11,164
Recorded Investment With No Allowance	2,998		2,998		8,019
Recorded Investment With Allowance	3,104		3,104		2,617
Total Recorded Investment	6,102		6,102		10,636
Related Allowance	99		99		88
Average Recorded Investment	6,161	12,720	6,203	12,771
Recognized Interest Income	58	81	127	129
Commercial lending | Construction and land
Impaired loans disclosures
Unpaid Principal Balance					4,781
Recorded Investment With No Allowance					3,973
Recorded Investment With Allowance					0
Total Recorded Investment					3,973
Related Allowance					0
Average Recorded Investment	0	4,414	0	4,584
Recognized Interest Income	0	0	0	0
Consumer lending
Impaired loans disclosures
Unpaid Principal Balance	29,242		29,242		23,476
Recorded Investment With No Allowance	8,530		8,530		2,287
Recorded Investment With Allowance	19,359		19,359		19,750
Total Recorded Investment	27,889		27,889		22,037
Related Allowance	2,622		2,622		3,029
Average Recorded Investment	27,955	21,526	28,017	21,586
Recognized Interest Income	300	48	610	125
Consumer lending | Real estate loan | Single-family
Impaired loans disclosures
Unpaid Principal Balance	17,109		17,109		15,501
Recorded Investment With No Allowance	4,037		4,037		0
Recorded Investment With Allowance	11,879		11,879		14,338
Total Recorded Investment	15,916		15,916		14,338
Related Allowance	53		53		534
Average Recorded Investment	15,962	16,985	16,012	17,038
Recognized Interest Income	115	35	269	93
Consumer lending | HELOCs
Impaired loans disclosures
Unpaid Principal Balance	9,642		9,642		5,484
Recorded Investment With No Allowance	4,493		4,493		2,287
Recorded Investment With Allowance	4,989		4,989		2,921
Total Recorded Investment	9,482		9,482		5,208
Related Allowance	78		78		4
Average Recorded Investment	9,502	4,541	9,514	4,548
Recognized Interest Income	138	13	249	32
Consumer lending | Other consumer
Impaired loans disclosures
Unpaid Principal Balance	2,491		2,491		2,491
Recorded Investment With No Allowance	0		0		0
Recorded Investment With Allowance	2,491		2,491		2,491
Total Recorded Investment	2,491		2,491		2,491
Related Allowance	2,491		2,491		$ 2,491
Average Recorded Investment	2,491	0	2,491	0
Recognized Interest Income	$ 47	$ 0	$ 92	$ 0

Loans Receivable and Allowanc77

Loans Receivable and Allowance for Credit Losses (Summary of Activities in Allowance for Loan Losses) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Allowance for loan losses
Beginning balance			$ 287,128
Charge-offs	$ (13,300)	$ (117)	(13,400)	$ (209)
Ending balance	301,550	276,316	301,550	276,316
Commercial lending | Commercial and industrial (“C&I”)
Allowance for loan losses
Beginning balance			163,058
Ending balance	162,404		162,404
Commercial lending | Commercial real estate (“CRE”)
Allowance for loan losses
Beginning balance			41,237
Ending balance	44,620		44,620
Commercial lending | Real estate loan | Multifamily
Allowance for loan losses
Beginning balance			19,109
Ending balance	18,486		18,486
Commercial lending | Construction and land
Allowance for loan losses
Beginning balance			26,881
Ending balance	30,362		30,362
Consumer lending | Real estate loan | Single-family
Allowance for loan losses
Beginning balance			26,362
Ending balance	33,388		33,388
Consumer lending | HELOCs
Allowance for loan losses
Beginning balance			7,354
Ending balance	7,277		7,277
Consumer lending | Other consumer
Allowance for loan losses
Beginning balance			3,127
Ending balance	5,013		5,013
Non-PCI Loans
Allowance for loan losses
Beginning balance	297,607	263,007	287,070	260,402
(Reversal of) provision for loan losses	15,139	10,680	35,072	18,726
Charge-offs	(13,696)	(5,391)	(32,159)	(12,600)
Recoveries	2,461	7,942	11,528	9,710
Net recoveries (charge-offs)	(11,235)	2,551	(20,631)	(2,890)
Ending balance	301,511	276,238	301,511	276,238
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Allowance for loan losses
Charge-offs	(13,534)	(5,386)	(31,979)	(12,443)
Recoveries	511	7,038	8,198	7,493
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)
Allowance for loan losses
Recoveries	2	423	429	992
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily
Allowance for loan losses
Recoveries	1,061	128	1,394	695
Non-PCI Loans | Commercial lending | Construction and land
Allowance for loan losses
Charge-offs	0	(1)	0	(149)
Recoveries	258	88	693	112
Non-PCI Loans | Consumer lending | Real estate loan | Single-family
Allowance for loan losses
Charge-offs	0	(1)	(1)	(1)
Recoveries	629	243	813	254
Non-PCI Loans | Consumer lending | HELOCs
Allowance for loan losses
Recoveries	0	0	0	24
Non-PCI Loans | Consumer lending | Other consumer
Allowance for loan losses
Charge-offs	(162)	(3)	(179)	(7)
Recoveries	0	22	1	140
PCI Loans
Allowance for loan losses
Beginning balance	47	87	58	118
(Reversal of) provision for loan losses	(8)	(9)	(19)	(40)
Ending balance	39	$ 78	39	$ 78
PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Allowance for loan losses
Beginning balance			0
Ending balance	0		0
PCI Loans | Commercial lending | Commercial real estate (“CRE”)
Allowance for loan losses
Beginning balance			58
Ending balance	39		39
PCI Loans | Commercial lending | Real estate loan | Multifamily
Allowance for loan losses
Beginning balance			0
Ending balance	0		0
PCI Loans | Commercial lending | Construction and land
Allowance for loan losses
Beginning balance			0
Ending balance	0		0
PCI Loans | Consumer lending | Real estate loan | Single-family
Allowance for loan losses
Beginning balance			0
Ending balance	0		0
PCI Loans | Consumer lending | HELOCs
Allowance for loan losses
Beginning balance			0
Ending balance	0		0
PCI Loans | Consumer lending | Other consumer
Allowance for loan losses
Beginning balance			0
Ending balance	$ 0		$ 0

Loans Receivable and Allowanc78

Loans Receivable and Allowance for Credit Losses (Summary of Activities in Allowance for Unfunded Credit Reserves) (Details) - Allowance for Unfunded Credit Reserves - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Allowance for unfunded credit reserves
Allowance for unfunded credit reserves, beginning of period	$ 13,614	$ 15,174	$ 13,318	$ 16,121
Provision for (reversal of) unfunded credit reserves	405	14	701	(933)
Allowance for unfunded credit reserves, end of period	$ 14,019	$ 15,188	$ 14,019	$ 15,188

Loans Receivable and Allowanc79

Loans Receivable and Allowance for Credit Losses (Allowance for Loan Losses and Recorded Investments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016
Allowance for loan losses
Allowance for loan losses	$ 301,550		$ 287,128	$ 276,316
Recorded investment in loans
Loans held-for-investment	30,230,379		28,975,718
Commercial lending
Recorded investment in loans
Loans held-for-investment	22,769,945		22,210,001
Commercial lending | Commercial and industrial (“C&I”)
Allowance for loan losses
Allowance for loan losses	162,404		163,058
Recorded investment in loans
Loans held-for-investment	11,059,019		10,697,231
Commercial lending | Commercial real estate (“CRE”)
Allowance for loan losses
Allowance for loan losses	44,620		41,237
Recorded investment in loans
Loans held-for-investment	9,054,567		8,936,897
Commercial lending | Real estate loan | Multifamily
Allowance for loan losses
Allowance for loan losses	18,486		19,109
Recorded investment in loans
Loans held-for-investment	2,032,522		1,916,176
Commercial lending | Construction and land
Allowance for loan losses
Allowance for loan losses	30,362		26,881
Recorded investment in loans
Loans held-for-investment	623,837		659,697
Consumer lending
Recorded investment in loans
Loans held-for-investment	7,460,434		6,765,717
Consumer lending | Real estate loan | Single-family
Allowance for loan losses
Allowance for loan losses	33,388		26,362
Recorded investment in loans
Loans held-for-investment	5,316,895		4,646,289
Consumer lending | HELOCs
Allowance for loan losses
Allowance for loan losses	7,277		7,354
Recorded investment in loans
Loans held-for-investment	1,769,511		1,782,924
Consumer lending | Other consumer
Allowance for loan losses
Allowance for loan losses	5,013		3,127
Recorded investment in loans
Loans held-for-investment	374,028		336,504
Non-PCI Loans
Allowance for loan losses
Individually evaluated for impairment	14,161		19,895
Collectively evaluated for impairment	287,350		267,175
Allowance for loan losses	301,511	$ 297,607	287,070	276,238	$ 263,007	$ 260,402
Recorded investment in loans
Individually evaluated for impairment	129,791		170,887
Collectively evaluated for impairment	29,716,903		28,322,544
Loans held-for-investment	29,846,694		28,493,431
Non-PCI Loans | Commercial lending
Recorded investment in loans
Loans held-for-investment	22,504,559		21,859,099
Non-PCI Loans | Commercial lending | Commercial and industrial (“C&I”)
Allowance for loan losses
Individually evaluated for impairment	10,920		16,094
Collectively evaluated for impairment	151,484		146,964
Recorded investment in loans
Individually evaluated for impairment	63,654		98,685
Collectively evaluated for impairment	10,992,571		10,586,751
Loans held-for-investment	11,056,225		10,685,436
Non-PCI Loans | Commercial lending | Commercial real estate (“CRE”)
Allowance for loan losses
Individually evaluated for impairment	520		684
Collectively evaluated for impairment	44,061		40,495
Recorded investment in loans
Individually evaluated for impairment	32,146		35,556
Collectively evaluated for impairment	8,803,930		8,623,653
Loans held-for-investment	8,836,076		8,659,209
Non-PCI Loans | Commercial lending | Real estate loan | Multifamily
Allowance for loan losses
Individually evaluated for impairment	99		88
Collectively evaluated for impairment	18,387		19,021
Recorded investment in loans
Individually evaluated for impairment	6,102		10,636
Collectively evaluated for impairment	1,982,362		1,844,492
Loans held-for-investment	1,988,464		1,855,128
Non-PCI Loans | Commercial lending | Construction and land
Allowance for loan losses
Individually evaluated for impairment	0		0
Collectively evaluated for impairment	30,362		26,881
Recorded investment in loans
Individually evaluated for impairment	0		3,973
Collectively evaluated for impairment	623,794		655,353
Loans held-for-investment	623,794		659,326
Non-PCI Loans | Consumer lending
Recorded investment in loans
Loans held-for-investment	7,342,135		6,634,332
Non-PCI Loans | Consumer lending | Real estate loan | Single-family
Allowance for loan losses
Individually evaluated for impairment	53		534
Collectively evaluated for impairment	33,335		25,828
Recorded investment in loans
Individually evaluated for impairment	15,916		14,338
Collectively evaluated for impairment	5,194,098		4,514,573
Loans held-for-investment	5,210,014		4,528,911
Non-PCI Loans | Consumer lending | HELOCs
Allowance for loan losses
Individually evaluated for impairment	78		4
Collectively evaluated for impairment	7,199		7,350
Recorded investment in loans
Individually evaluated for impairment	9,482		5,208
Collectively evaluated for impairment	1,748,611		1,763,709
Loans held-for-investment	1,758,093		1,768,917
Non-PCI Loans | Consumer lending | Other consumer
Allowance for loan losses
Individually evaluated for impairment	2,491		2,491
Collectively evaluated for impairment	2,522		636
Recorded investment in loans
Individually evaluated for impairment	2,491		2,491
Collectively evaluated for impairment	371,537		334,013
Loans held-for-investment	374,028		336,504
Acquired with deteriorated credit quality
Allowance for loan losses
Allowance for loan losses	39	$ 47	58	$ 78	$ 87	$ 118
Recorded investment in loans
Loans held-for-investment	383,685		482,287
Acquired with deteriorated credit quality | Commercial lending
Recorded investment in loans
Loans held-for-investment	265,386		350,902
Acquired with deteriorated credit quality | Commercial lending | Commercial and industrial (“C&I”)
Allowance for loan losses
Allowance for loan losses	0		0
Recorded investment in loans
Loans held-for-investment	2,794		11,795
Acquired with deteriorated credit quality | Commercial lending | Commercial real estate (“CRE”)
Allowance for loan losses
Allowance for loan losses	39		58
Recorded investment in loans
Loans held-for-investment	218,491		277,688
Acquired with deteriorated credit quality | Commercial lending | Real estate loan | Multifamily
Allowance for loan losses
Allowance for loan losses	0		0
Recorded investment in loans
Loans held-for-investment	44,058		61,048
Acquired with deteriorated credit quality | Commercial lending | Construction and land
Allowance for loan losses
Allowance for loan losses	0		0
Recorded investment in loans
Loans held-for-investment	43		371
Acquired with deteriorated credit quality | Consumer lending
Recorded investment in loans
Loans held-for-investment	118,299		131,385
Acquired with deteriorated credit quality | Consumer lending | Real estate loan | Single-family
Allowance for loan losses
Allowance for loan losses	0		0
Recorded investment in loans
Loans held-for-investment	106,881		117,378
Acquired with deteriorated credit quality | Consumer lending | HELOCs
Allowance for loan losses
Allowance for loan losses	0		0
Recorded investment in loans
Loans held-for-investment	11,418		14,007
Acquired with deteriorated credit quality | Consumer lending | Other consumer
Allowance for loan losses
Allowance for loan losses	0		0
Recorded investment in loans
Loans held-for-investment	$ 0		$ 0

Loans Receivable and Allowanc80

Loans Receivable and Allowance for Credit Losses (Accretable Yield for PCI Loans) (Details) - PCI Loans - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Changes in accretable yield for PCI loans
Accretable yield for PCI loans, beginning of period	$ 95,864	$ 127,990	$ 101,977	$ 136,247
Accretion	(11,084)	(11,082)	(20,218)	(21,361)
Changes in expected cash flows	272	1,717	3,293	3,739
Accretable yield for PCI loans, end of period	$ 85,052	$ 118,625	$ 85,052	$ 118,625

Loans Receivable and Allowanc81

Loans Receivable and Allowance for Credit Losses (Loan Purchases, Sales And Transfers Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES
Loans held-for-sale	$ 14,658	$ 85

Loans Receivable and Allowanc82

Loans Receivable and Allowance for Credit Losses (Loan Purchases, Sales and Transfers) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	$ 129,864	$ 65,953	$ 285,631	$ 343,977
Sales	178,916	88,760	293,203	364,705
Purchases	309,776	221,454	389,822	368,696
Write-down of loans transferred from loans held-for-investment to loans held-for-sale recorded to allowance for loan losses	13,300	117	13,400	209
Net gains from sales of loans held-for-sale during the period, excluding lower of cost or fair value adjustment	2,300	1,600	3,900	4,400
Lower of cost or fair value adjustment		(8)		61
C & I and CRE | Originated
Loans Receivable and Allowance for Credit Losses
Sales	103,500	38,300	193,200	67,600
Loans sold in secondary market | Purchased
Loans Receivable and Allowance for Credit Losses
Sales	75,400	50,500	100,000	297,100
Commercial lending | Commercial and industrial (“C&I”)
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	99,449	58,817	245,840	324,076
Sales	140,326	76,441	242,691	313,120
Purchases	285,615	220,612	350,362	367,728
Commercial lending | Commercial real estate (“CRE”)
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	30,415	5,668	39,791	18,433
Sales	30,415	5,668	39,791	18,433
Purchases	0	0	0	0
Commercial lending | Real estate loan | Multifamily
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	0	532	0	532
Sales	0	532	0	532
Purchases	3,249	714	3,435	840
Commercial lending | Construction and land
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	0	687	0	687
Sales	0	687	0	687
Purchases	0	0	0	0
Consumer lending | Real estate loan | Single-family
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	0	249	0	249
Sales	8,175	5,432	10,721	9,742
Purchases	20,912	128	36,025	128
Consumer lending | Other consumer
Loans Receivable and Allowance for Credit Losses
Loans transferred from held-for-investment to held-for-sale	0	0	0	0
Sales	0	0	0	22,191
Purchases	$ 0	$ 0	$ 0	$ 0

Investments in Qualified Affo83

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Investments in Qualified Affordable Housing Partnerships, Net) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
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	$ 152,556		$ 152,556		$ 162,824
Accrued expenses and other liabilities — Unfunded commitments	52,110		52,110		$ 55,815
Tax credits and other tax benefits recognized	8,940	$ 9,566	18,095	$ 19,187
Amortization expense included in income tax expense	$ 6,700	$ 7,051	$ 13,773	$ 14,001

Investments in Qualified Affo84

Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net (Investments in Tax Credit and Other Investments, Net) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Investments in Tax Credit and Other Investments, Net [Line Items]
Investments in tax credit and other investments, net	$ 242,595		$ 242,595		$ 224,551
Amortization expense included in noninterest expense	20,481	$ 27,872	37,881	$ 42,232
Marketable equity securities					31,900
Unrealized loss recognized on marketable equity securities held	(159)		(613)
Investments in tax credit and other investments, net
Investments in Tax Credit and Other Investments, Net [Line Items]
Marketable equity securities	30,900		30,900
Accrued expenses and other liabilities
Investments in Tax Credit and Other Investments, Net [Line Items]
Accrued expenses and other liabilities — Unfunded commitments	$ 109,432		$ 109,432		$ 113,372

Goodwill and Other Intangible85

Goodwill and Other Intangible Assets (Goodwill and Impairment) (Details)	1 Months Ended	6 Months Ended
	Mar. 31, 2018USD ($)	Jun. 30, 2018USD ($)segment	Dec. 31, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill		$ 465,547,000	$ 469,433,000
Number of reporting units | segment		3
Goodwill impairment			$ 0
Desert Community Bank
Goodwill [Line Items]
Decrease in goodwill	$ (3,900,000)

Goodwill and Other Intangible86

Goodwill and Other Intangible Assets (Core Deposit Intangibles) (Details) - Core Deposit Intangibles - USD ($)	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross balance	$ 86,099,000			$ 86,099,000		$ 100,166,000
Accumulated amortization	(68,935,000)			(68,935,000)		(79,112,000)
Net carrying balance	17,164,000			17,164,000		$ 21,054,000
Write-off upon dispositions	$ 0		$ 0	$ 0	$ 0
Desert Community Bank
Finite-Lived Intangible Assets [Line Items]
Write-off upon dispositions		$ 1,000,000

Goodwill and Other Intangible87

Goodwill and Other Intangible Assets (Amortization Expense of Core Deposit Intangibles) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense	$ 1,400	$ 1,800	$ 2,900	$ 3,600
Core Deposit Intangibles
Year Ended December 31,
Remainder of 2018	2,635		2,635
2,019	4,518		4,518
2,020	3,634		3,634
2,021	2,749		2,749
2,022	1,865		1,865
Thereafter	1,763		1,763
Net carrying balance	$ 17,164		$ 17,164		$ 21,054

Commitments and Contingencies88

Commitments and Contingencies (Credit-related Commitments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Loan commitments	$ 5,122,314	$ 5,075,480
Commercial letters of credit and SBLCs	$ 1,702,514	$ 1,655,897

Commitments and Contingencies89

Commitments and Contingencies (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Guarantees
Commercial letters of credit and SBLCs	$ 1,702,514	$ 1,655,897
Accrued expenses and other liabilities
Guarantees
Allowance for unfunded credit reserves	13,900	12,700
Other Commitments
Unfunded commitments in investments in qualified affordable housing partnerships, tax credit and other investments	161,500	169,200
Single Family and Multi-family Residential | Loans Sold or Securitized with Recourse
Guarantees
Principal amount outstanding on loans sold or securitized	99,700	113,700
Maximum potential future payments up to recourse component	36,700	38,700
Single Family and Multi-family Residential | Loans Sold or Securitized with Recourse | Accrued expenses and other liabilities
Guarantees
Allowance for unfunded credit reserves	153	$ 214
Standby Letters of Credit
Guarantees
Commercial letters of credit and SBLCs	1,630,000
Commercial Letters of Credit
Guarantees
Commercial letters of credit and SBLCs	$ 71,400

Revenue from Contracts with C90

Revenue from Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 14,641	$ 13,702	$ 28,024	$ 27,961
Other sources of noninterest income	33,627	33,542	94,688	135,111
Total noninterest income	48,268	47,244	122,712	163,072
Retail Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	11,172	10,435	21,052	20,545
Other sources of noninterest income	3,413	3,206	37,981	6,660
Total noninterest income	14,585	13,641	59,033	27,205
Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,221	3,146	6,566	7,190
Other sources of noninterest income	27,523	23,438	51,616	45,128
Total noninterest income	30,744	26,584	58,182	52,318
Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	248	121	406	226
Other sources of noninterest income	2,691	6,898	5,091	83,323
Total noninterest income	2,939	7,019	5,497	83,549
Deposit service charges and related fee income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	8,986	9,090	18,172	17,774
Deposit service charges and related fee income | Retail Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	5,738	6,157	11,752	11,994
Deposit service charges and related fee income | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	3,000	2,812	6,014	5,554
Deposit service charges and related fee income | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	248	121	406	226
Card income
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	1,154	1,231	2,398	2,471
Card income | Retail Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	933	1,029	2,003	2,056
Card income | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	221	202	395	415
Card income | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	0	0	0
Wealth management fees
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,501	3,381	7,454	7,716
Wealth management fees | Retail Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	4,501	3,249	7,297	6,495
Wealth management fees | Commercial Banking
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	0	132	157	1,221
Wealth management fees | Other
Disaggregation of Revenue [Line Items]
Revenue from contracts with customers	$ 0	$ 0	$ 0	$ 0

Stock Compensation Plans (Narra

Stock Compensation Plans (Narrative) (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options outstanding (in shares)	0		0
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options outstanding (in shares)	0		0
Stock Purchase Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options outstanding (in shares)	0		0
RSAs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options outstanding (in shares)	0		0
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
Performance-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options outstanding (in shares)	411,290	424,299
Total unrecognized compensation cost	$ 22.8
Weighted average period to recognize unrecognized compensation cost	2 years 1 month 27 days
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
Time-Based RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards other than options outstanding (in shares)	1,185,963	1,166,580
Total unrecognized compensation cost	$ 42.2
Weighted average period to recognize unrecognized compensation cost	2 years 2 months 27 days

Stock Compensation Plans (Compe

Stock Compensation Plans (Compensation Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Total Stock Compensation Expense and Related Net Tax Benefit [Abstract]
Stock compensation costs	$ 7,057	$ 4,964	$ 13,215	$ 10,115
Related net tax benefits for stock compensation plans	$ 97	$ 49	$ 4,875	$ 4,463

Stock Compensation Plans (Summa

Stock Compensation Plans (Summary of Activity for Time-Based and Performance-Based RSUs) (Details)	6 Months Ended
	Jun. 30, 2018$ / sharesshares
Time-Based RSUs
Shares
Outstanding, beginning of period (in shares) | shares	1,166,580
Granted (in shares) | shares	401,830
Vested (in shares) | shares	(324,051)
Forfeited (in shares) | shares	(58,396)
Outstanding, end of period (in shares) | shares	1,185,963
Weighted-Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 42
Granted (in dollars per share) | $ / shares	67.30
Vested (in dollars per share) | $ / shares	40.10
Forfeited (in dollars per share) | $ / shares	47.65
Outstanding, end of period (in dollars per share) | $ / shares	$ 50.81
Performance-Based RSUs
Shares
Outstanding, beginning of period (in shares) | shares	424,299
Granted (in shares) | shares	120,286
Vested (in shares) | shares	(133,295)
Forfeited (in shares) | shares	0
Outstanding, end of period (in shares) | shares	411,290
Weighted-Average Grant Date Fair Value
Outstanding, beginning of period (in dollars per share) | $ / shares	$ 41.44
Granted (in dollars per share) | $ / shares	70.13
Vested (in dollars per share) | $ / shares	41.15
Forfeited (in dollars per share) | $ / shares	0
Outstanding, end of period (in dollars per share) | $ / shares	$ 49.93

Stockholders' Equity and Earn94

Stockholders' Equity and Earnings Per Share (Warrants) (Details) - shares	Jun. 30, 2018	Jan. 17, 2014	Jan. 16, 2014
Class of Stock [Line Items]
Number of warrants exercised (in warrants)	0
Common Stock
Class of Stock [Line Items]
Shares of East West's common stock into which the warrant may be converted (in shares)		230,282
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 Earn95

Stockholders' Equity and Earnings Per Share (Earnings Per Share Calculation) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic
Net income	$ 172,349	$ 118,330	$ 359,381	$ 288,066
Basic weighted average number of shares outstanding (in shares)	144,899	144,485	144,782	144,368
Basic EPS (in dollars per share)	$ 1.19	$ 0.82	$ 2.48	$ 2
Diluted
Net income	$ 172,349	$ 118,330	$ 359,381	$ 288,066
Basic weighted average number of shares outstanding (in shares)	144,899	144,485	144,782	144,368
Diluted potential common shares (in shares)	1,192	1,255	1,264	1,406
Diluted weighted average number of shares outstanding (in shares)	146,091	145,740	146,046	145,774
Diluted EPS (in dollars per share)	$ 1.18	$ 0.81	$ 2.46	$ 1.98

Stockholders' Equity and Earn96

Stockholders' Equity and Earnings Per Share (Weighted Average Anti-dilutive Shares) (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Weighted average anti-dilutive shares (in shares)	4,012	2,423	3,807	5,132

Accumulated Other Comprehensi97

Accumulated Other Comprehensive Income (Loss) (Components of AOCI) (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				$ 3,841,951	$ 3,427,741
Cumulative effect of change in accounting principle related to marketable equity securities	[1]					$ (160)
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate	[2]			0
Other comprehensive (loss) income		$ (15,663)	$ 9,337	(27,677)	13,965
Ending balance		4,114,284	3,670,261	4,114,284	3,670,261
Available- for-Sale Investment Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(55,981)	(25,151)	(30,898)	(28,772)
Net unrealized (losses) gains arising during the period		(8,693)	7,777	(26,004)	12,832
Amounts reclassified from AOCI		(148)	(1,576)	(1,649)	(3,010)
Other comprehensive (loss) income		(8,841)	6,201	(27,653)	9,822
Ending balance		(64,822)	(18,950)	(64,822)	(18,950)
Available- for-Sale Investment Securities | ASU 2016-01
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of change in accounting principle related to marketable equity securities						385
Available- for-Sale Investment Securities | ASU 2018-02
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate				(6,656)
Available- for-Sale Investment Securities | Balance, adjusted
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				(37,169)	(28,772)
Foreign Currency Translation Adjustments
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		177	(18,367)	(6,621)	(19,374)
Net unrealized (losses) gains arising during the period		(6,822)	3,136	(24)	4,143
Amounts reclassified from AOCI		0	0	0	0
Other comprehensive (loss) income		(6,822)	3,136	(24)	4,143
Ending balance		(6,645)	(15,231)	(6,645)	(15,231)
Foreign Currency Translation Adjustments | Balance, adjusted
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				(6,621)	(19,374)
AOCI, Net of Tax
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance		(55,804)	(43,518)	(37,519)	(48,146)
Cumulative effect of change in accounting principle related to marketable equity securities	[1]					385
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate	[2]			(6,656)
Net unrealized (losses) gains arising during the period		(15,515)	10,913	(26,028)	16,975
Amounts reclassified from AOCI		(148)	(1,576)	(1,649)	(3,010)
Other comprehensive (loss) income		(15,663)	9,337	(27,677)	13,965
Ending balance		$ (71,467)	$ (34,181)	(71,467)	(34,181)
AOCI, Net of Tax | ASU 2016-01
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Cumulative effect of change in accounting principle related to marketable equity securities						$ 385
AOCI, Net of Tax | ASU 2018-02
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Reclassification of tax effects in AOCI resulting from the new federal corporate income tax rate				(6,656)
AOCI, Net of Tax | Balance, adjusted
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance				$ (43,790)	$ (48,146)
[1]	Represents the impact of the adoption of Accounting Standards Update (“ASU”) 2016-01, Financial Instruments — Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities in the first quarter of 2018. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.
[2]	Represents amounts reclassified from AOCI to retained earnings due to the early adoption of ASU 2018-02, Income Statement — Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income in the first quarter of 2018. Refer to Note 2 — Current Accounting Developments to the Consolidated Financial Statements for additional information.

Accumulated Other Comprehensi98

Accumulated Other Comprehensive Income (Loss) (Components of Other Comprehensive Income (Loss)) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Before-Tax
Net change	$ (19,374)	$ 13,836	$ (39,282)	$ 21,090
Tax Effect
Net change	3,711	(4,499)	11,605	(7,125)
Net-of-Tax
Other comprehensive (loss) income	(15,663)	9,337	(27,677)	13,965
Available- for-Sale Investment Securities
Before-Tax
Net unrealized (losses) gains arising during the period	(12,342)	13,420	(36,919)	22,141
Net realized gains reclassified into net income	(210)	(2,720)	(2,339)	(5,194)
Net change	(12,552)	10,700	(39,258)	16,947
Tax Effect
Net unrealized (losses) gains arising during the period	3,649	(5,643)	10,915	(9,309)
Net realized gains reclassified into net income	62	1,144	690	2,184
Net change	3,711	(4,499)	11,605	(7,125)
Net-of-Tax
Net unrealized (losses) gains arising during the period	(8,693)	7,777	(26,004)	12,832
Net realized gains reclassified into net income	(148)	(1,576)	(1,649)	(3,010)
Other comprehensive (loss) income	(8,841)	6,201	(27,653)	9,822
Foreign Currency Translation Adjustments
Before-Tax
Net unrealized (losses) gains arising during the period	(6,822)	3,136	(24)	4,143
Net change	(6,822)	3,136	(24)	4,143
Tax Effect
Net unrealized (losses) gains arising during the period	0	0	0	0
Net change	0	0	0	0
Net-of-Tax
Net unrealized (losses) gains arising during the period	(6,822)	3,136	(24)	4,143
Net realized gains reclassified into net income	0	0	0	0
Other comprehensive (loss) income	$ (6,822)	$ 3,136	$ (24)	$ 4,143

Business Segments (Narrative) (

Business Segments (Narrative) (Details)	6 Months Ended
	Jun. 30, 2018segmentbusiness_division
Segment Reporting [Abstract]
Number of operating segments	3
Number of business segments | business_division	3
Number of segment whom broad administrative support are provided	2

Business Segments (Operating Re

Business Segments (Operating Results and Other Key Financial Measures) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Segment Reporting Information
Interest income	$ 400,311	$ 322,775	$ 772,184	$ 625,444
Charge for funds used	(200,371)	(125,406)	(379,337)	(245,820)
Interest spread on funds used	199,940	197,369	392,847	379,624
Interest expense	(58,632)	(32,684)	(103,812)	(63,231)
Credit on funds provided	200,371	125,406	379,337	245,820
Interest spread on funds provided (used)	141,739	92,722	275,525	182,589
Net interest income before provision for credit losses	341,679	290,091	668,372	562,213
(Reversal of) provision for credit losses	15,536	10,685	35,754	17,753
Noninterest income	48,268	47,244	122,712	163,072
Noninterest expense	177,419	168,965	346,554	321,843
Segment income (loss) before income taxes	196,992	157,685	408,776	385,689
Segment income after income taxes	172,349	118,330	359,381	288,066
Segment assets	38,072,954	35,917,617	38,072,954	35,917,617	$ 37,150,249
Retail Banking
Segment Reporting Information
Interest income	110,808	88,752	215,518	169,777
Charge for funds used	(56,915)	(33,139)	(106,188)	(60,877)
Interest spread on funds used	53,893	55,613	109,330	108,900
Interest expense	(31,991)	(18,377)	(56,931)	(34,560)
Credit on funds provided	158,446	106,094	303,897	208,640
Interest spread on funds provided (used)	126,455	87,717	246,966	174,080
Net interest income before provision for credit losses	180,348	143,330	356,296	282,980
(Reversal of) provision for credit losses	3,414	(664)	6,507	(286)
Noninterest income	14,585	13,641	59,033	27,205
Noninterest expense	86,144	79,950	168,112	152,794
Segment income (loss) before income taxes	105,375	77,685	240,710	157,677
Segment income after income taxes	75,496	45,679	172,464	92,714
Segment assets	9,816,103	8,438,706	9,816,103	8,438,706
Commercial Banking
Segment Reporting Information
Interest income	261,567	205,873	501,144	398,292
Charge for funds used	(126,782)	(77,750)	(238,148)	(142,259)
Interest spread on funds used	134,785	128,123	262,996	256,033
Interest expense	(11,635)	(5,184)	(20,814)	(10,282)
Credit on funds provided	30,728	12,623	56,176	24,666
Interest spread on funds provided (used)	19,093	7,439	35,362	14,384
Net interest income before provision for credit losses	153,878	135,562	298,358	270,417
(Reversal of) provision for credit losses	12,122	11,349	29,247	18,039
Noninterest income	30,744	26,584	58,182	52,318
Noninterest expense	56,706	44,551	121,726	98,924
Segment income (loss) before income taxes	115,794	106,246	205,567	205,772
Segment income after income taxes	83,210	62,766	147,572	121,562
Segment assets	22,199,992	20,456,579	22,199,992	20,456,579
Other
Segment Reporting Information
Interest income	27,936	28,150	55,522	57,375
Charge for funds used	(16,674)	(14,517)	(35,001)	(42,684)
Interest spread on funds used	11,262	13,633	20,521	14,691
Interest expense	(15,006)	(9,123)	(26,067)	(18,389)
Credit on funds provided	11,197	6,689	19,264	12,514
Interest spread on funds provided (used)	(3,809)	(2,434)	(6,803)	(5,875)
Net interest income before provision for credit losses	7,453	11,199	13,718	8,816
(Reversal of) provision for credit losses	0	0	0	0
Noninterest income	2,939	7,019	5,497	83,549
Noninterest expense	34,569	44,464	56,716	70,125
Segment income (loss) before income taxes	(24,177)	(26,246)	(37,501)	22,240
Segment income after income taxes	13,643	9,885	39,345	73,790
Segment assets	$ 6,056,859	$ 7,022,332	$ 6,056,859	$ 7,022,332

Subsequent Events (Details)

Subsequent Events (Details) - $ / shares	Aug. 15, 2018	Jul. 19, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Subsequent events
Dividends declared per common share (in dollars per share)			$ 0.20	$ 0.20	$ 0.40	$ 0.40
Subsequent Event
Subsequent events
Dividends declared per common share (in dollars per share)		$ 0.23
Subsequent Event | Forecast
Subsequent events
Dividends paid per common share (in dollars per share)	$ 0.23