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Regulatory Matters - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jan. 01, 2016
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Customers Bancorp, Inc. |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Common equity Tier 1 (to risk-weighted-assets), actual amount | $ 745,795 |  | $ 689,494 |
Tier 1 capital (to risk-weighted assets), actual amount | 963,266 |  | 906,963 |
Total capital (to risk-weighted assets), actual amount | 1,081,962 |  | 1,021,601 |
Tier 1 capital (to average assets), actual amount | $ 963,266 |  | $ 906,963 |
Common equity Tier 1 (to risk-weighted assets), actual ratio | 8.964% |  | 8.805% |
Tier 1 capital (to risk-weighted assets), actual ratio | 11.578% |  | 11.583% |
Total capital (to risk-weighted assets), actual ratio | 13.005% |  | 13.047% |
Tier 1 capital (to average assets), actual ratio | 9.665% |  | 8.937% |
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount | $ 374,388 |  | $ 352,368 |
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount | 499,185 |  | 469,824 |
Total capital (to risk-weighted assets), for capital adequacy purposes amount | 665,580 |  | 626,432 |
Tier 1 capital (to average assets), for capital adequacy purposes amount | $ 398,668 |  | $ 405,949 |
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes ratio | 4.50% | 6.375% | 4.50% |
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes ratio | 6.00% | 7.875% | 6.00% |
Total capital (to risk-weighted assets), for capital adequacy purposes ratio | 8.00% | 9.875% | 8.00% |
Tier 1 capital (to average assets), for capital adequacy purposes ratio | 4.00% |  | 4.00% |
Common equity Tier 1 (to risk-weighted assets), for Basel III amount | $ 530,384 |  | $ 450,248 |
Tier 1 (to risk-weighted assets), for Basel III amount | 655,180 |  | 567,704 |
Total capital (to risk-weighted assets), for Basel III amount | 821,575 |  | 724,313 |
Tier 1 capital (to average assets) for Basel III amount | $ 398,668 |  | $ 405,949 |
Common equity Tier 1 (to risk-weighted assets), for Basel III ratio | 6.375% |  | 5.75% |
Tier 1 capital (to risk-weighted assets), for Basel III ratio | 7.875% |  | 7.25% |
Total capital (to risk-weighted assets), for Basel III ratio | 9.875% |  | 9.25% |
Tier 1 capital (to average assets), for Basel III ratio | 4.00% |  | 4.00% |
Customers Bank |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Common equity Tier 1 (to risk-weighted-assets), actual amount | $ 1,066,121 |  | $ 1,023,564 |
Tier 1 capital (to risk-weighted assets), actual amount | 1,066,121 |  | 1,023,564 |
Total capital (to risk-weighted assets), actual amount | 1,215,522 |  | 1,170,666 |
Tier 1 capital (to average assets), actual amount | $ 1,066,121 |  | $ 1,023,564 |
Common equity Tier 1 (to risk-weighted assets), actual ratio | 12.822% |  | 13.081% |
Tier 1 capital (to risk-weighted assets), actual ratio | 12.822% |  | 13.081% |
Total capital (to risk-weighted assets), actual ratio | 14.619% |  | 14.961% |
Tier 1 capital (to average assets), actual ratio | 10.699% |  | 10.092% |
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount | $ 374,160 |  | $ 352,122 |
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount | 498,879 |  | 469,496 |
Total capital (to risk-weighted assets), for capital adequacy purposes amount | 665,173 |  | 625,994 |
Tier 1 capital (to average assets), for capital adequacy purposes amount | $ 398,570 |  | $ 405,701 |
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes ratio | 4.50% |  | 4.50% | 5.125%
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes ratio | 6.00% |  | 6.00% | 6.625%
Total capital (to risk-weighted assets), for capital adequacy purposes ratio | 8.00% |  | 8.00% | 8.625%
Tier 1 capital (to average assets), for capital adequacy purposes ratio | 4.00% |  | 4.00% |
Common equity Tier 1 (to risk-weighted assets), to be well capitalized under prompt correction action provisions amount | $ 540,453 |  | $ 508,621 |
Tier 1 capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount | 665,173 |  | 625,994 |
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount | 831,466 |  | 782,493 |
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions amount | $ 498,212 |  | $ 507,126 |
Common equity Tier 1 (to risk-weighted assets), to be well capitalized under prompt corrective action provisions ratio | 6.50% |  | 6.50% |
Tier 1 capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions ratio | 8.00% |  | 8.00% |
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions ratio | 10.00% |  | 10.00% |
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions ratio | 5.00% |  | 5.00% |
Common equity Tier 1 (to risk-weighted assets), for Basel III amount | $ 530,059 |  | $ 449,934 |
Tier 1 (to risk-weighted assets), for Basel III amount | 654,779 |  | 567,307 |
Total capital (to risk-weighted assets), for Basel III amount | 821,072 |  | 723,806 |
Tier 1 capital (to average assets) for Basel III amount | $ 398,570 |  | $ 405,701 |
Common equity Tier 1 (to risk-weighted assets), for Basel III ratio | 6.375% |  | 5.75% |
Tier 1 capital (to risk-weighted assets), for Basel III ratio | 7.875% |  | 7.25% |
Total capital (to risk-weighted assets), for Basel III ratio | 9.875% |  | 9.25% |
Tier 1 capital (to average assets), for Basel III ratio | 4.00% |  | 4.00% |

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Data Type: | na
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- Details
Name: | dei_LegalEntityAxis=cubi_CustomersBankMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |