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Regulatory Capital (Tables)
 9 Months Ended
Sep. 30, 2018
Banking and Thrift [Abstract]  
Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios
Generally, to comply with the regulatory definition of adequately capitalized, or well capitalized, respectively, or to comply with the Basel III capital requirements, an institution must at least maintain the common equity Tier 1, Tier 1 and total risk-based capital ratios and the Tier 1 leverage ratio in excess of the related minimum ratios as set forth in the following table:
 
 
 
 
 
Minimum Capital Levels to be Classified as:
 
Actual
 
Adequately Capitalized
 
Well Capitalized
 
Basel III Compliant
(amounts in thousands)
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
 
Amount
 
Ratio
As of September 30, 2018:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Common equity Tier 1 capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customers Bancorp, Inc.
$
740,968

 
8.703
%
 
$
383,113

 
4.500
%
 
N/A

 
N/A

 
$
542,744

 
6.375
%
Customers Bank
$
1,054,869

 
12.393
%
 
$
383,042

 
4.500
%
 
$
553,282

 
6.500
%
 
$
542,642

 
6.375
%
Tier 1 capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customers Bancorp, Inc.
$
958,418

 
11.257
%
 
$
510,818

 
6.000
%
 
N/A

 
N/A

 
$
670,448

 
7.875
%
Customers Bank
$
1,054,869

 
12.393
%
 
$
510,722

 
6.000
%
 
$
680,963

 
8.000
%
 
$
670,323

 
7.875
%
Total capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customers Bancorp, Inc.
$
1,080,245

 
12.688
%
 
$
681,090

 
8.000
%
 
N/A

 
N/A

 
$
840,721

 
9.875
%
Customers Bank
$
1,204,825

 
14.154
%
 
$
680,963

 
8.000
%
 
$
851,204

 
10.000
%
 
$
840,563

 
9.875
%
Tier 1 capital (to average assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customers Bancorp, Inc.
$
958,418

 
8.913
%
 
$
430,099

 
4.000
%
 
N/A

 
N/A

 
$
430,099

 
4.000
%
Customers Bank
$
1,054,869

 
9.814
%
 
$
429,939

 
4.000
%
 
$
537,423

 
5.000
%
 
$
429,939

 
4.000
%
As of December 31, 2017:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Common equity Tier 1 capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customers Bancorp, Inc.
$
689,494

 
8.805
%
 
$
352,368

 
4.500
%
 
N/A

 
N/A

 
$
450,248

 
5.750
%
Customers Bank
$
1,023,564

 
13.081
%
 
$
352,122

 
4.500
%
 
$
508,621

 
6.500
%
 
$
449,934

 
5.750
%
Tier 1 capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customers Bancorp, Inc.
$
906,963

 
11.583
%
 
$
469,824

 
6.000
%
 
N/A

 
N/A

 
$
567,704

 
7.250
%
Customers Bank
$
1,023,564

 
13.081
%
 
$
469,496

 
6.000
%
 
$
625,994

 
8.000
%
 
$
567,307

 
7.250
%
Total capital (to risk-weighted assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customers Bancorp, Inc.
$
1,021,601

 
13.047
%
 
$
626,432

 
8.000
%
 
N/A

 
N/A

 
$
724,313

 
9.250
%
Customers Bank
$
1,170,666

 
14.961
%
 
$
625,994

 
8.000
%
 
$
782,493

 
10.000
%
 
$
723,806

 
9.250
%
Tier 1 capital (to average assets)
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Customers Bancorp, Inc.
$
906,963

 
8.937
%
 
$
405,949

 
4.000
%
 
N/A

 
N/A

 
$
405,949

 
4.000
%
Customers Bank
$
1,023,564

 
10.092
%
 
$
405,701

 
4.000
%
 
$
507,126

 
5.000
%
 
$
405,701

 
4.000
%