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Regulatory Capital - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Common equity Tier 1 capital (to risk weighted assets), Actual Amount | $ 740,968 |  | $ 689,494 |
Tier 1 capital (to risk weighted assets), Actual Amount | 958,418 |  | 906,963 |
Total capital (to risk weighted assets), Actual Amount | 1,080,245 |  | 1,021,601 |
Tier 1 capital (to average assets), Actual Amount | $ 958,418 |  | $ 906,963 |
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 8.703% |  | 8.805% |
Tier 1 capital (to risk weighted assets), Actual Ratio | 11.257% |  | 11.583% |
Total capital (to risk weighted assets), Actual Ratio | 12.688% |  | 13.047% |
Tier 1 capital (to average assets), Actual Ratio | 8.913% |  | 8.937% |
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 383,113 |  | $ 352,368 |
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 510,818 |  | 469,824 |
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 681,090 |  | 626,432 |
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 430,099 |  | $ 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 | $ 542,744 |  | $ 450,248 |
Tier 1 (to risk weighted assets) Required for Basel III amount | 670,448 |  | 567,704 |
Total capital (to risk weighted assets), for Basel III amount | 840,721 |  | 724,313 |
Tier 1 (to risk average assets), for Basel III amount | $ 430,099 |  | $ 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 capital (to risk weighted assets), Actual Amount | $ 1,054,869 |  | $ 1,023,564 |
Tier 1 capital (to risk weighted assets), Actual Amount | 1,054,869 |  | 1,023,564 |
Total capital (to risk weighted assets), Actual Amount | 1,204,825 |  | 1,170,666 |
Tier 1 capital (to average assets), Actual Amount | $ 1,054,869 |  | $ 1,023,564 |
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 12.393% |  | 13.081% |
Tier 1 capital (to risk weighted assets), Actual Ratio | 12.393% |  | 13.081% |
Total capital (to risk weighted assets), Actual Ratio | 14.154% |  | 14.961% |
Tier 1 capital (to average assets), Actual Ratio | 9.814% |  | 10.092% |
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 383,042 |  | $ 352,122 |
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 510,722 |  | 469,496 |
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 680,963 |  | 625,994 |
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 429,939 |  | $ 405,701 |
Common equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Ratio | 4.50% |  | 4.50% | 6.375%
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 6.00% |  | 6.00% | 7.875%
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 8.00% |  | 8.00% | 9.875%
Tier 1 capital (to average assets), For Capital Adequacy Purposes Ratio | 4.00% |  | 4.00% |
Common equity Tier 1 Capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 553,282 |  | $ 508,621 |
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 680,963 |  | 625,994 |
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 851,204 |  | 782,493 |
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 537,423 |  | $ 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 | $ 542,642 |  | $ 449,934 |
Tier 1 (to risk weighted assets) Required for Basel III amount | 670,323 |  | 567,307 |
Total capital (to risk weighted assets), for Basel III amount | 840,563 |  | 723,806 |
Tier 1 (to risk average assets), for Basel III amount | $ 429,939 |  | $ 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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Period Type: | instant

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |