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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 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 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
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 (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 | %
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 628,139 |  |  | 8.487 | % |  | $ | 333,049 |  |  | 4.500 | % |  | N/A |  |  | N/A |  |  | $ | 379,306 |  |  | 5.125 | %
Customers Bank | $ | 857,421 |  |  | 11.626 | % |  | $ | 331,879 |  |  | 4.500 | % |  | $ | 479,380 |  |  | 6.500 | % |  | $ | 377,973 |  |  | 5.125 | %
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 844,755 |  |  | 11.414 | % |  | $ | 444,065 |  |  | 6.000 | % |  | N/A |  |  | N/A |  |  | $ | 490,322 |  |  | 6.625 | %
Customers Bank | $ | 857,421 |  |  | 11.626 | % |  | $ | 442,505 |  |  | 6.000 | % |  | $ | 590,006 |  |  | 8.000 | % |  | $ | 488,599 |  |  | 6.625 | %
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 966,097 |  |  | 13.053 | % |  | $ | 592,087 |  |  | 8.000 | % |  | N/A |  |  | N/A |  |  | $ | 638,343 |  |  | 8.625 | %
Customers Bank | $ | 1,003,609 |  |  | 13.608 | % |  | $ | 590,006 |  |  | 8.000 | % |  | $ | 737,508 |  |  | 10.000 | % |  | $ | 636,101 |  |  | 8.625 | %
Tier 1 capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 844,755 |  |  | 9.067 | % |  | $ | 372,652 |  |  | 4.000 | % |  | N/A |  |  | N/A |  |  | $ | 372,652 |  |  | 4.000 | %
Customers Bank | $ | 857,421 |  |  | 9.233 | % |  | $ | 371,466 |  |  | 4.000 | % |  | $ | 464,333 |  |  | 5.000 | % |  | $ | 371,466 |  |  | 4.000 | %

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