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Regulatory Requirements and Matters (Tables)
 12 Months Ended
Dec. 31, 2019
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, 2019 and 2018:
 
($ in thousands)
 
Basel III
 
December 31, 2019
 
December 31, 2018
 
Actual
 
Minimum
Capital
   Ratios (3)
 
Well
Capitalized
Requirement
 
Actual
 
Minimum
Capital
   Ratios (3)
 
Well
Capitalized
Requirement
 
Amount
 
Ratio
 
Ratio
 
Ratio
 
Amount
 
Ratio
 
Ratio
 
Ratio
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Total capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
 
$
5,064,037

 
14.4
%
 
10.50
%
 
10.0
%
 
$
4,438,730

 
13.7
%
 
9.88
%
 
10.0
%
East West Bank
 
$
4,886,237

 
13.9
%
 
10.50
%
 
10.0
%
 
$
4,268,616

 
13.1
%
 
9.88
%
 
10.0
%
Tier 1 capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
 
$
4,546,592

 
12.9
%
 
8.50
%
 
8.0
%
 
$
3,966,842

 
12.2
%
 
7.88
%
 
8.0
%
East West Bank
 
$
4,516,792

 
12.9
%
 
8.50
%
 
8.0
%
 
$
3,944,728

 
12.1
%
 
7.88
%
 
8.0
%
CET1 capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
 
$
4,546,592

 
12.9
%
 
7.00
%
 
6.5
%
 
$
3,966,842

 
12.2
%
 
6.38
%
 
6.5
%
East West Bank
 
$
4,516,792

 
12.9
%
 
7.00
%
 
6.5
%
 
$
3,944,728

 
12.1
%
 
6.38
%
 
6.5
%
Tier 1 leverage capital (to adjusted average assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company (1)
 
$
4,546,592

 
10.3
%
 
4.0
%
 
N/A

 
$
3,966,842

 
9.9
%
 
4.0
%
 
N/A

East West Bank
 
$
4,516,792

 
10.3
%
 
4.0
%
 
5.0
%
 
$
3,944,728

 
9.8
%
 
4.0
%
 
5.0
%
Risk-weighted assets
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
 
$
35,136,427

 
N/A

 
N/A

 
N/A

 
$
32,497,296

 
N/A

 
N/A

 
N/A

East West Bank
 
$
35,127,920

 
N/A

 
N/A

 
N/A

 
$
32,477,002

 
N/A

 
N/A

 
N/A

Adjusted quarterly average total assets (2)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Company
 
$
44,449,802

 
N/A

 
N/A

 
N/A

 
$
40,636,402

 
N/A

 
N/A

 
N/A

East West Bank
 
$
44,419,308

 
N/A

 
N/A

 
N/A

 
$
40,611,215

 
N/A

 
N/A

 
N/A

 

(1)
The Tier 1 leverage capital well-capitalized requirement applies to the Bank only since there is no Tier 1 leverage ratio component in the definition of a well-capitalized bank holding company.
(2)
Reflects adjusted average total assets for the years ended December 31, 2019 and 2018.
(3)
The CET1, Tier 1, and total capital minimum ratios include a fully phased-in capital conservation buffer of 2.5% and a transition capital conservation buffer of 1.875% for the years ended December 31, 2019 and 2018, respectively.
N/A — Not applicable.