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Employee Benefit Plans | 12 Months Ended
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Dec. 31, 2017
Retirement Benefits [Abstract] |
Employee Benefit Plans | Employee Benefit Plans The Company sponsors a defined contribution plan, the East West Bank Employees 401(k) Savings Plan (the “Plan”), designed to provide retirement benefits financed by participants’ tax deferred contributions for the benefits of its employees. A Roth 401(k) investment option is also available to the participants, with contributions to be made on an after-tax basis. Under the terms of the Plan, eligible employees may elect to defer up to 80% of their compensation before taxes, up to the dollar limit imposed by the IRS for tax purposes. Participants can also designate a part or all of their contributions as Roth 401(k) contributions. Effective as of April 1, 2014, the Company matches 75% of the first 6% of the Plan participant’s deferred compensation. The Company’s contributions to the Plan are determined annually by the Board of Directors in accordance with the Plan requirements. Plan participants become vested in matching contributions received from the Plan sponsor at the rate of 20% per year for each full year of service, such that the Plan participants become 100% vested after five years of credited service. For the Plan years ended December 31, 2017, 2016 and 2015, the Company expensed $8.9 million, $8.4 million and $7.5 million, respectively. During 2002, the Company adopted a Supplemental Executive Retirement Plan (“SERP”) pursuant to which the Company will pay supplemental pension benefits to certain executive officers designated by the Board of Directors upon retirement based upon the officers’ years of service and compensation. The SERP meets the definition of a pension plan per ASC 715-30, Compensation — Retirement Benefits — Defined Benefit Plans — Pension. The SERP is an unfunded, non-qualified plan under which the participants have no rights beyond those of a general creditor of the Company, and there are no specific assets set aside by the Company in connection with the plan. As of December 31, 2017, there were no additional benefits to be accrued for under the SERP. As of each of December 31, 2017 and 2016, there was one executive remaining under the SERP. For the years ended December 31, 2017, 2016 and 2015, $331 thousand, $624 thousand and $619 thousand, respectively, of benefits were expensed and accrued for. The benefit obligation was $4.2 million and $4.1 million as of December 31, 2017 and 2016, respectively. The following table presents a summary of expected SERP payments to be paid for the next five years and thereafter as of December 31, 2017:
Years Ending December 31, |  | Amount ($ in thousands)
2018 |  | $ | 319 |
2019 |  | 329 |
2020 |  | 339 |
2021 |  | 349 |
2022 |  | 359 |
Thereafter |  | 7,855 |
Total |  | $ | 9,550 |

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- Definition The entire disclosure for an entity's employee compensation and benefit plans, including, but not limited to, postemployment and postretirement benefit plans, defined benefit pension plans, defined contribution plans, non-qualified and supplemental benefit plans, deferred compensation, share-based compensation, life insurance, severance, health care, unemployment and other benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 712 -URI http://asc.fasb.org/topic&trid=2197446 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 710 -URI http://asc.fasb.org/topic&trid=2127225 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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