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Regulatory Matters | 12 Months Ended
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Dec. 31, 2017
Banking and Thrift [Abstract] |
Regulatory Matters | REGULATORY MATTERS The Bank and the Bancorp are subject to various regulatory capital requirements administered by the federal banking agencies. Failure to meet the minimum capital requirements can result in certain mandatory, and possibly additional discretionary, actions by regulators that, if undertaken, could have a direct material effect on Customers' financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank and Bancorp must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance-sheet items, as calculated under the regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings and other factors. Prompt corrective action provisions are not applicable to bank holding companies. Quantitative measures established by regulation to ensure capital adequacy require the Bank and the Bancorp to maintain minimum amounts and ratios (set forth in the following table) of common equity Tier 1, Tier 1, and total capital to risk-weighted assets, and Tier 1 capital to average assets (as defined in the regulations). At December 31, 2017 and 2016, the Bank and the Bancorp met all capital adequacy requirements to which they were subject. 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 | %
The risk-based capital rules adopted effective January 1, 2015, required that banks and holding companies maintain a "capital conservation buffer" of 250 basis points in excess of the "minimum capital ratio" or certain elective distributions would be limited. The minimum capital ratio is equal to the prompt corrective action adequately capitalized threshold ratio. The capital conservation buffer is being phased in over four years beginning on January 1, 2016, with a maximum buffer of 0.625% of risk- weighted assets for 2016, 1.25% for 2017, 1.875% for 2018 and 2.5% for 2019 and thereafter. Effective January 1, 2017, the capital level required to avoid limitation on elective distributions applicable to the Bancorp and the Bank were as follows: (i) a common equity Tier 1 risk-based capital ratio of 5.750%; (ii) a Tier 1 risk-based capital ratio of 7.250% and (iii) a Total risk-based capital ratio of 9.250%. Failure to maintain the required capital conservation buffer will result in limitations on elective distributions, including capital distributions and discretionary bonuses to executive officers.

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- Definition The entire disclosure for banks, savings institutions, and credit unions, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of Thrift Supervision (OTS) or for any state imposed capital requirements, as applicable. The disclosure may include (1) a description of regulatory capital requirements (a) for capital adequacy purposes and (b) established by the prompt corrective action provisions of Section 38 of the Federal Depository Insurance Act; (2) the actual or possible material effects of noncompliance with such requirements; (3) whether the entity is in compliance with the regulatory capital requirements including (a) required and actual ratios and amounts of Tier 1 leverage, Tier 1 risk-based, and total risk-based capital, tangible capital (for savings institutions), and Tier 3 capital for market risk (for certain banks and bank holding companies), (b) factors that may significantly affect capital adequacy; (4) the prompt corrective action category in which the entity was classified as of its most recent notification; (5) whether management believes any conditions or events since notification have changed the entity's category. Also may include additional information that might be disclosed in situations where substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time. + References Reference 1: 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1C -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958572-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1E -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958574-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958569-112826 Reference 6: 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 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1F -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958575-112826 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1D -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958573-112826 + Details
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