Regulatory Requirements and Matters (Tables)

12 Months Ended

Dec. 31, 2017

Banking and Thrift [Abstract]

Schedule of regulatory capital information

The following table presents the regulatory capital information of the Company and the Bank as of December 31, 2017 and 2016:

	Basel III
	December 31, 2017								December 31, 2016
($ in thousands)	Actual				Minimum Requirement		Well Capitalized Requirement		Actual				Minimum Requirement		Well Capitalized Requirement
	Amount		Ratio		Ratio		Ratio		Amount		Ratio		Ratio		Ratio
Total capital (to risk-weighted assets)
Company	$	3,838,516	12.9	%	8.0	%	10.0	%	$	3,400,642	12.4	%	8.0	%	10.0	%
East West Bank	$	3,679,261	12.4	%	8.0	%	10.0	%	$	3,371,885	12.3	%	8.0	%	10.0	%
Tier 1 capital (to risk-weighted assets)
Company	$	3,390,070	11.4	%	6.0	%	8.0	%	$	2,976,002	10.9	%	6.0	%	8.0	%
East West Bank	$	3,378,815	11.4	%	6.0	%	8.0	%	$	3,095,245	11.3	%	6.0	%	8.0	%
CET1 capital(to risk-weighted assets)
Company	$	3,390,070	11.4	%	4.5	%	6.5	%	$	2,976,002	10.9	%	4.5	%	6.5	%
East West Bank	$	3,378,815	11.4	%	4.5	%	6.5	%	$	3,095,245	11.3	%	4.5	%	6.5	%
Tier 1 leverage capital (to adjusted average assets)
Company	$	3,390,070	9.2	%	4.0	%	5.0	%	$	2,976,002	8.7	%	4.0	%	5.0	%
East West Bank	$	3,378,815	9.2	%	4.0	%	5.0	%	$	3,095,245	9.1	%	4.0	%	5.0	%
Risk-weighted assets
Company	$	29,669,251	N/A		N/A		N/A		$	27,357,753	N/A		N/A		N/A
East West Bank	$	29,643,711	N/A		N/A		N/A		$	27,310,540	N/A		N/A		N/A
Adjusted quarterly average total assets (1)
Company	$	37,307,975	N/A		N/A		N/A		$	34,209,827	N/A		N/A		N/A
East West Bank	$	37,283,273	N/A		N/A		N/A		$	34,163,667	N/A		N/A		N/A

(1) Reflects adjusted average total assets for the years ended December 31, 2017 and 2016.

N/A — Not applicable