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Regulatory Capital (Tables) | 6 Months Ended
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Jun. 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 |  | Adequacy Capitalized |  | Well Capitalized |  | Basel III Compliant
(amounts in thousands) | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of June 30, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 735,609 |  |  | 8.611 | % |  | $ | 384,418 |  |  | 4.500 | % |  | N/A |  |  | N/A |  |  | $ | 544,591 |  |  | 6.375 | %
Customers Bank | $ | 1,054,613 |  |  | 12.351 | % |  | $ | 384,232 |  |  | 4.500 | % |  | $ | 555,002 |  |  | 6.500 | % |  | $ | 544,329 |  |  | 6.375 | %
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 953,025 |  |  | 11.156 | % |  | $ | 512,557 |  |  | 6.000 | % |  | N/A |  |  | N/A |  |  | $ | 672,731 |  |  | 7.875 | %
Customers Bank | $ | 1,054,613 |  |  | 12.351 | % |  | $ | 512,309 |  |  | 6.000 | % |  | $ | 683,079 |  |  | 8.000 | % |  | $ | 672,406 |  |  | 7.875 | %
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 1,072,072 |  |  | 12.550 | % |  | $ | 683,409 |  |  | 8.000 | % |  | N/A |  |  | N/A |  |  | $ | 843,583 |  |  | 9.875 | %
Customers Bank | $ | 1,202,070 |  |  | 14.078 | % |  | $ | 683,079 |  |  | 8.000 | % |  | $ | 853,849 |  |  | 10.000 | % |  | $ | 843,176 |  |  | 9.875 | %
Tier 1 capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 953,025 |  |  | 8.866 | % |  | $ | 429,963 |  |  | 4.000 | % |  | N/A |  |  | N/A |  |  | $ | 429,963 |  |  | 4.000 | %
Customers Bank | $ | 1,054,613 |  |  | 9.822 | % |  | $ | 429,471 |  |  | 4.000 | % |  | $ | 536,839 |  |  | 5.000 | % |  | $ | 429,471 |  |  | 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 | %

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