The following table presents the notional amounts and fair values of the Company’s derivatives as of September 30, 2023 and December 31, 2022. Certain derivative contracts are cleared though central clearing organizations where variation margin is applied daily as settlement to the fair values of the contracts. The fair values are presented on a gross basis prior to the application of bilateral collateral and master netting agreements, but after the application of variation margin payments as settlement to fair values of contracts cleared through central clearing organizations. Applying variation margin payments as settlement to the fair values of derivative contracts cleared through the London Clearing House (“LCH”) and the Chicago Mercantile Exchange (“CME”) resulted in reductions in the derivative asset and liability fair values by $16.0 million and $65.7 million, respectively, as of September 30, 2023. In comparison, applying variation margin payments as settlement to LCH- and CME-cleared derivative transactions resulted in reductions in the derivative asset and liability fair values by $167.2 million and $81.3 million, respectively, as of December 31, 2022. Total derivative asset and liability fair values are adjusted to reflect the effects of legally enforceable master netting agreements and cash collateral received or paid. The resulting net derivative asset and liability fair values are included in Other assets and Accrued expenses and other liabilities, respectively, on the Consolidated Balance Sheet.



	September 30, 2023								December 31, 2022
			Fair Value								Fair Value
($ in thousands)	Notional Amount		Derivative Assets			Derivative Liabilities			Notional Amount		Derivative Assets			Derivative Liabilities
Derivatives designated as hedging instruments:


Cash flow hedges:
Interest rate contracts	$	5,000,000	$	1,288		$	96,382		$	3,450,000	$	13,455		$	19,687
Net investment hedges:
Foreign exchange contracts	81,480		3,709			—			84,832		5,590			—
Total derivatives designated as hedging instruments	$	5,081,480	$	4,997		$	96,382		$	3,534,832	$	19,045		$	19,687
Derivatives not designated as hedging instruments:
Interest rate contracts	$	17,456,102	$	622,799		$	615,920		$	16,932,414	$	426,828		$	564,829
Commodity contracts (1)	—		137,500			143,855			—		261,613			258,608
Foreign exchange contracts	5,205,007		96,668			77,099			2,982,891		47,519			44,117
Credit contracts (2)	143,703		—			12			140,950		—			23
Equity contracts	—		352		(3)	15,119		(4)	—		323		(3)	—
Total derivatives not designated as hedging instruments	$	22,804,812	$	857,319		$	852,005		$	20,056,255	$	736,283		$	867,577
Gross derivative assets/liabilities			$	862,316		$	948,387				$	755,328		$	887,264
Less: Master netting agreements			(260,648)			(260,648)					(242,745)			(242,745)
Less: Cash collateral received			(269,683)			(2,225)					(372,038)			—
Net derivative assets/liabilities			$	331,985		$	685,514				$	140,545		$	644,519

(1)The notional amount of the Company’s commodity contracts totaled 20,672 thousand barrels of crude oil and 363,020 thousand units of natural gas, measured in million British thermal units (“MMBTUs”) as of September 30, 2023. In comparison, the notional amount of the Company’s commodity contracts totaled 12,005 thousand barrels of crude oil and 247,704 thousand MMBTUs of natural gas as of December 31, 2022.

Cash Flow Hedges — The Company uses interest rate swaps to hedge the variability in interest received on certain floating-rate commercial loans, or paid on certain floating-rate borrowings due to changes in contractually specified interest rates. As of September 30, 2023, interest rate contracts in notional amounts of $5.00 billion were designated as cash flow hedges to convert certain variable-rate loans from floating-rate payments to fixed-rate payments. Gains and losses on the hedging derivative instruments are recognized in AOCI and reclassified to earnings in the same period the hedged cash flows impact earnings and within the same income statement line item as the hedged cash flows. Considering the interest rates, yield curve and notional amount as of September 30, 2023, the Company expects to reclassify an estimated $66.2 million of after-tax net losses on derivative instruments designated as cash flow hedges from AOCI into earnings during the next 12 months.

The following table presents the pre-tax changes in AOCI from cash flow hedges for the three and nine months ended September 30, 2023 and 2022. The after-tax impact of cash flow hedges on AOCI is shown in Note 14 — Accumulated Other Comprehensive Income (Loss) to the Consolidated Financial Statements in this Form-10-Q.



	Three Months Ended September 30,				Nine Months Ended September 30,
($ in thousands)	2023		2022		2023			2022
Losses recognized in AOCI:
Interest rate contracts	$	(62,715)	$	(48,325)	$	(129,329)		$	(88,771)


Gains (losses) reclassified from AOCI into earnings:
Interest expense (for cash flow hedges on borrowings)	$	—	$	1,251	$	696		$	1,385
Interest and dividend income (for cash flow hedges on loans)	(24,059)		(2,870)		(57,265)			216
Noninterest income	—		—		1,614		(1)	—
Total	$	(24,059)	$	(1,619)	$	(54,955)		$	1,601

Net Investment Hedges — The Company enters into foreign currency forward contracts to hedge a portion of the Bank’s investment in East West Bank (China) Limited, a non-USD functional currency subsidiary in China. The hedging instruments designated as net investment hedges were used to hedge against the risk of adverse changes in the foreign currency exchange rate of the Chinese Renminbi (“RMB”). The following table presents the pre-tax gains recognized in AOCI on net investment hedges for the three and nine months ended September 30, 2023 and 2022:

Customer-Related Positions and Economic Hedge Derivatives — The Company enters into interest rate, commodity, and foreign exchange derivatives at the request of its customers and generally enters into offsetting derivative contracts with third-party financial institutions to mitigate the inherent market risk. The Company also utilizes foreign exchange contracts to mitigate the effect of currency fluctuations on certain foreign currency-denominated on-balance sheet assets and liabilities, primarily foreign currency denominated deposits that it offers to its customers. A majority of the foreign exchange contracts had original maturities of one year or less as of both September 30, 2023 and December 31, 2022.



	September 30, 2023						December 31, 2022
			Fair Value						Fair Value
($ in thousands)	Notional Amount		Assets		Liabilities		Notional Amount		Assets		Liabilities
Customer-related positions:
Interest rate contracts:
Swaps	$	6,890,450	$	691	$	584,962	$	6,656,491	$	1,438	$	521,719
Written options	1,486,958		—		21,864		1,548,158		—		30,904
Collars and corridors	306,996		—		7,619		215,773		—		8,924
Subtotal	8,684,404		691		614,445		8,420,422		1,438		561,547
Foreign exchange contracts:
Forwards and spot	62,237		11,376		24,484		993,588		17,009		18,090
Swaps	2,494,517		16,282		23,687		623,143		6,629		12,178
Other	142,000		5,630		—		121,631		2,070		245
Subtotal	2,698,754		33,288		48,171		1,738,362		25,708		30,513
Total	$	11,383,158	$	33,979	$	662,616	$	10,158,784	$	27,146	$	592,060
Economic hedges:
Interest rate contracts:
Swaps	$	6,916,364	$	592,177	$	1,119	$	6,683,828	$	384,201	$	2,047
Purchased options	1,517,648		22,285		—		1,580,275		32,233		—
Written options	30,690		—		356		32,117		—		1,235
Collars and corridors	306,996		7,646		—		215,772		8,956		—
Subtotal	8,771,698		622,108		1,475		8,511,992		425,390		3,282
Foreign exchange contracts:
Forwards and spot	1,060,498		452		313		77,998		3,050		87
Swaps	1,303,755		62,928		22,985		1,044,900		18,516		11,447
Other	142,000		—		5,630		121,631		245		2,070
Subtotal	2,506,253		63,380		28,928		1,244,529		21,811		13,604
Total	$	11,277,951	$	685,488	$	30,403	$	9,756,521	$	447,201	$	16,886

The Company enters into energy commodity contracts with its customers in the oil and gas sector, which allow them to hedge against the risk of fluctuation in energy commodity prices. Offsetting contracts entered with third-party financial institutions are used as economic hedges to manage the Company’s exposure on its customer-related positions. The following table presents the notional amounts in units and the gross fair values of the commodity derivatives issued for customer-related positions and economic hedges as of September 30, 2023 and December 31, 2022:



	September 30, 2023						December 31, 2022
			Fair Value						Fair Value
($ and unit in thousands)	Notional Units		Assets		Liabilities		Notional Units		Assets		Liabilities
Customer-related positions:
Commodity contracts:
Crude oil:
Swaps	3,958	Barrels	$	27,543	$	1,717	2,465	Barrels	$	39,955	$	6,178
Collars	6,362	Barrels	24,552		119		3,011	Barrels	16,038		2,630
Written options	—	Barrels	—		—		—	Barrels	558		—
Subtotal	10,320	Barrels	52,095		1,836		5,476	Barrels	56,551		8,808
Natural gas:
Swaps	129,940	MMBTUs	32,428		55,387		92,590	MMBTUs	112,314		73,208
Collars	50,763	MMBTUs	865		11,535		32,072	MMBTUs	2,217		18,317
Written options	1,955	MMBTUs	—		206		—	MMBTUs	—		—
Subtotal	182,658	MMBTUs	33,293		67,128		124,662	MMBTUs	114,531		91,525
Total			$	85,388	$	68,964			$	171,082	$	100,333
Economic hedges:
Commodity contracts:
Crude oil:
Swaps	3,990	Barrels	$	2,165	$	24,403	2,587	Barrels	$	6,935	$	36,060
Collars	6,362	Barrels	—		18,781		3,942	Barrels	1,378		12,856
Purchased options	—	Barrels	—		—		—	Barrels	—		516
Subtotal	10,352	Barrels	2,165		43,184		6,529	Barrels	8,313		49,432
Natural gas:
Swaps	129,405	MMBTUs	42,804		31,289		91,900	MMBTUs	69,767		106,883
Collars	49,003	MMBTUs	6,937		418		31,142	MMBTUs	12,451		1,960
Purchased options	1,955	MMBTUs	206		—		—	MMBTUs	—		—
Subtotal	180,363	MMBTUs	49,947		31,707		123,042	MMBTUs	82,218		108,843
Total			$	52,112	$	74,891			$	90,531	$	158,275

Credit Contracts — The Company periodically enters into credit RPAs with institutional counterparties to manage the credit exposure of the interest rate contracts associated with syndication loans. Under the RPAs, a portion of the credit exposure is transferred from one party (the purchaser of credit protection) to another party (the seller of credit protection). The seller of credit protection is required to make payments to the purchaser of credit protection if the underlying borrower defaults on the related interest rate contract. The Company may enter into protection sold or protection purchased RPAs. Credit risk on RPAs is managed by monitoring the credit worthiness of the borrowers and the institutional counterparties, which is a part of the Company’s normal credit review and monitoring process. All referenced entities of the protection sold RPAs were investment grade and the weighted-average remaining maturity was 2.5 years and 2.4 years as of September 30, 2023 and December 31, 2022, respectively. Assuming that the underlying borrowers referenced in the interest rate contracts defaulted, the Company would not have any current exposure in the protection sold RPAs as of both September 30, 2023 and December 31, 2022.

Equity Contracts — As part of the loan origination process, the Company may obtain warrants to purchase the preferred and/or common stock of the borrowers’ companies, which are mainly in the technology and life sciences sectors. Warrants grant the Company the right to buy a certain class of the underlying company’s equity at a certain price before expiration. In connection with the Company’s investment in Rayliant during the third quarter of 2023, the Company granted PRSUs as part of its consideration. The vesting of these equity contracts is contingent on Rayliant meeting certain financial performance targets during the future performance period. For additional information on these equity contracts, refer to Note 3 — Fair Value Measurement and Fair Value of Financial Instruments and Note 8 — Investments in Qualified Affordable Housing Partnerships, Tax Credit and Other Investments, Net and Variable Interest Entities to the Consolidated Financial Statements in this Form 10-Q.



	Classification on Consolidated Statement of Income	Three Months Ended September 30,				Nine Months Ended September 30,
($ in thousands)		2023		2022		2023		2022
Derivatives not designated as hedging instruments:
Interest rate contracts	Interest rate contracts and other derivative income	$	5,283	$	4,870	$	4,022	$	18,439
Foreign exchange contracts	Foreign exchange income	7,267		3,831		37,607		6,596
Credit contracts	Interest rate contracts and other derivative income	4		50		11		114
Equity contracts - warrants	Lending fees	89		(13)		29		175

Commodity contracts	Interest rate contracts and other derivative income	27		(156)		193		139
Net gains		$	12,670	$	8,582	$	41,862	$	25,463

Credit-Risk-Related Contingent Features — Certain of the Company’s over-the-counter derivative contracts contain early termination provisions that require the Company to settle any outstanding balances upon the occurrence of a specified credit-risk-related event. Such an event primarily relates to a downgrade of the credit rating of East West Bank to below investment grade. As of September 30, 2023, the aggregate fair value amounts of all derivative instruments with credit-risk-related contingent features that were in a net liability position totaled $2.2 million, and $2.2 million collateral was posted to cover these positions. In comparison, as of December 31, 2022, the aggregate fair value amounts of all derivative instruments with credit-risk-related contingent features that were in a net liability position totaled $2.6 million, of which $1.1 million of collateral was posted to cover these positions. If the credit rating of East West Bank had been downgraded to below investment grade, the Company would have been required to post minimal additional collateral as of both September 30, 2023 and December 31, 2022.

The following tables present the gross derivative fair values, the balance sheet netting adjustments, and the resulting net fair values recorded on the Consolidated Balance Sheet, as well as the cash and noncash collateral associated with master netting arrangements. The gross amounts of derivative assets and liabilities are presented after the application of variation margin payments as settlements to the fair values of contracts cleared through central clearing organizations, where applicable. The collateral amounts in the following tables are limited to the outstanding balances of the related asset or liability. Therefore, instances of over-collateralization are not shown:



($ in thousands)	As of September 30, 2023

	Gross Amounts Recognized (1)		Gross Amounts Offset on the Consolidated Balance Sheet				Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet		Net Amount
			Master Netting Arrangements		Cash Collateral Received (3)				Security Collateral Received (5)
Derivative assets	$	862,316	$	(260,648)	$	(269,683)	$	331,985	$	(280,043)	$	51,942

	Gross Amounts Recognized (2)		Gross Amounts Offset on the Consolidated Balance Sheet				Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet		Net Amount
			Master Netting Arrangements		Cash Collateral Pledged (4)				Security Collateral Pledged (5)
Derivative liabilities	$	948,387	$	(260,648)	$	(2,225)	$	685,514	$	—	$	685,514



($ in thousands)	As of December 31, 2022

	Gross Amounts Recognized (1)		Gross Amounts Offset on the Consolidated Balance Sheet				Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet		Net Amount
			Master Netting Arrangements		Cash Collateral Received (3)				Security Collateral Received (5)
Derivative assets	$	755,328	$	(242,745)	$	(372,038)	$	140,545	$	(60,567)	$	79,978

	Gross Amounts Recognized (2)		Gross Amounts Offset on the Consolidated Balance Sheet				Net Amounts Presented on the Consolidated Balance Sheet		Gross Amounts Not Offset on the Consolidated Balance Sheet		Net Amount
			Master Netting Arrangements		Cash Collateral Pledged (4)				Security Collateral Pledged (5)
Derivative liabilities	$	887,264	$	(242,745)	$	—	$	644,519	$	(38,438)	$	606,081

(3)Gross cash collateral received under master netting arrangements or similar agreements was $275.7 million and $384.9 million as of September 30, 2023 and December 31, 2022, respectively. Of the gross cash collateral received, $269.7 million and $372.0 million were used to offset against derivative assets as of September 30, 2023 and December 31, 2022, respectively.

(4)Gross cash collateral pledged under master netting arrangements or similar agreements was $3.1 million and $490 thousand as of September 30, 2023 and December 31, 2022, respectively. Of the gross cash collateral pledged, $2.2 million was used to offset against derivative liabilities as of September 30, 2023. In comparison, no cash collateral was used to offset against derivative liabilities as of December 31, 2022.

(5)Represents the fair value of security collateral received or pledged limited to derivative assets or liabilities that are subject to enforceable master netting arrangements or similar agreements. U.S. GAAP does not permit the netting of noncash collateral on the Consolidated Balance Sheet but requires the disclosure of such amounts.

In addition to the amounts included in the tables above, the Company has balance sheet netting related to resale and repurchase agreements. Refer to Note 4 — Assets Purchased under Resale Agreements and Sold under Repurchase Agreements to the Consolidated Financial Statements in this Form 10-Q for additional information. Refer to Note 3 — Fair Value Measurement and Fair Value of Financial Instruments to the Consolidated Financial Statements in this Form 10-Q for fair value measurement disclosures on derivatives.