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Regulatory Capital - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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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 | $ 1,082,396 | $ 954,839
Tier 1 capital (to risk weighted assets), Actual Amount | 1,299,867 | 1,172,310
Total capital (to risk weighted assets), Actual Amount | 1,502,069 | 1,401,119
Tier 1 capital (to average assets), Actual Amount | $ 1,299,867 | $ 1,172,310
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 9.56% | 8.079%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.11481 | 0.09919
Total capital (to risk weighted assets), Actual Ratio | 0.13267 | 0.11855
Tier 1 capital (to average assets), Actual Ratio | 0.08389 | 0.08597
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 509,472 | $ 531,844
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 679,296 | 709,125
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 905,729 | 945,500
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 619,832 | $ 545,485
Common equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Ratio | 4.50% | 4.50%
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 0.06000 | 0.06000
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 0.08000 | 0.08000
Tier 1 capital (to average assets), For Capital Adequacy Purposes Ratio | 0.04000 | 0.04000
Common equity Tier 1 (to risk weighted assets), for Basel III amount | $ 792,512 | $ 827,312
Tier 1 (to risk weighted assets) Required for Basel III amount | 962,337 | 1,004,594
Total capital (to risk weighted assets), for Basel III amount | 1,188,769 | 1,240,969
Tier 1 (to risk average assets), for Basel III amount | $ 619,832 | $ 545,485
Common equity Tier 1 (to risk weighted assets), for Basel III ratio | 7.00% | 7.00%
Tier 1 capital (to risk weighted assets), for Basel III ratio | 8.50% | 8.50%
Total capital (to risk weighted assets), for Basel III ratio | 10.50% | 10.50%
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 | $ 1,403,324 | $ 1,254,082
Tier 1 capital (to risk weighted assets), Actual Amount | 1,403,324 | 1,254,082
Total capital (to risk weighted assets), Actual Amount | 1,559,161 | 1,424,791
Tier 1 capital (to average assets), Actual Amount | $ 1,403,324 | $ 1,254,082
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 12.395% | 10.615%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.12395 | 0.10615
Total capital (to risk weighted assets), Actual Ratio | 0.13772 | 0.12060
Tier 1 capital (to average assets), Actual Ratio | 0.09070 | 0.09208
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 509,460 | $ 531,639
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 679,279 | 708,852
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 905,706 | 945,136
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 618,871 | $ 544,758
Common equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Ratio | 4.50% | 4.50%
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 0.06000 | 0.06000
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 0.08000 | 0.08000
Tier 1 capital (to average assets), For Capital Adequacy Purposes Ratio | 0.04000 | 0.04000
Common equity Tier 1 Capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 735,886 | $ 767,923
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 905,706 | 945,136
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,132,132 | 1,181,421
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 773,589 | $ 680,947
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 | 0.08000 | 0.08000
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.10000 | 0.10000
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 0.05000 | 0.05000
Common equity Tier 1 (to risk weighted assets), for Basel III amount | $ 792,493 | $ 826,994
Tier 1 (to risk weighted assets) Required for Basel III amount | 962,313 | 1,004,207
Total capital (to risk weighted assets), for Basel III amount | 1,188,739 | 1,240,492
Tier 1 (to risk average assets), for Basel III amount | $ 618,871 | $ 544,758
Common equity Tier 1 (to risk weighted assets), for Basel III ratio | 7.00% | 7.00%
Tier 1 capital (to risk weighted assets), for Basel III ratio | 8.50% | 8.50%
Total capital (to risk weighted assets), for Basel III ratio | 10.50% | 10.50%
Tier 1 capital (to average assets), for Basel III ratio | 4.00% | 4.00%

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