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Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 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, 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 March 31, 2018: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common equity Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 710,156 |  |  | 8.508 | % |  | $ | 375,609 |  |  | 4.500 | % |  | N/A |  |  | N/A |  |  | $ | 532,113 |  |  | 6.375 | %
Customers Bank | $ | 1,037,480 |  |  | 12.448 | % |  | $ | 375,048 |  |  | 4.500 | % |  | $ | 541,736 |  |  | 6.500 | % |  | $ | 531,318 |  |  | 6.375 | %
Tier 1 capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 927,627 |  |  | 11.113 | % |  | $ | 500,812 |  |  | 6.000 | % |  | N/A |  |  | N/A |  |  | $ | 657,316 |  |  | 7.875 | %
Customers Bank | $ | 1,037,480 |  |  | 12.448 | % |  | $ | 500,064 |  |  | 6.000 | % |  | $ | 666,751 |  |  | 8.000 | % |  | $ | 656,333 |  |  | 7.875 | %
Total capital (to risk-weighted assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 1,047,698 |  |  | 12.552 | % |  | $ | 667,749 |  |  | 8.000 | % |  | N/A |  |  | N/A |  |  | $ | 824,253 |  |  | 9.875 | %
Customers Bank | $ | 1,186,105 |  |  | 14.231 | % |  | $ | 666,751 |  |  | 8.000 | % |  | $ | 833,439 |  |  | 10.000 | % |  | $ | 823,021 |  |  | 9.875 | %
Tier 1 capital (to average assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Customers Bancorp, Inc. | $ | 927,627 |  |  | 9.031 | % |  | $ | 410,858 |  |  | 4.000 | % |  | N/A |  |  | N/A |  |  | $ | 410,858 |  |  | 4.000 | %
Customers Bank | $ | 1,037,480 |  |  | 10.107 | % |  | $ | 410,612 |  |  | 4.000 | % |  | $ | 513,265 |  |  | 5.000 | % |  | $ | 410,612 |  |  | 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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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 + Details
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