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Regulatory Capital - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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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 | $ 827,884 | $ 821,810
Tier 1 capital (to risk weighted assets), Actual Amount | 1,045,355 | 1,039,281
Total capital (to risk weighted assets), Actual Amount | 1,277,340 | 1,256,309
Tier 1 capital (to average assets), Actual Amount | $ 1,045,355 | $ 1,039,281
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 7.56% | 7.984%
Tier 1 capital (to risk weighted assets), Actual Ratio | 9.546% | 10.096%
Total capital (to risk weighted assets), Actual Ratio | 11.665% | 12.205%
Tier 1 capital (to average assets), Actual Ratio | 9.011% | 9.258%
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 492,760 | $ 463,211
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 657,013 | 617,615
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 876,017 | 823,487
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 464,045 | $ 449,026
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 | 6.00% | 6.00%
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 8.00% | 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 | $ 766,515 | $ 720,551
Tier 1 (to risk weighted assets) Required for Basel III amount | 930,768 | 874,955
Total capital (to risk weighted assets), for Basel III amount | 1,149,773 | 1,080,827
Tier 1 (to risk average assets), for Basel III amount | $ 464,045 | $ 449,026
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 | $ 1,158,308 | $ 1,164,652
Tier 1 capital (to risk weighted assets), Actual Amount | 1,158,308 | 1,164,652
Total capital (to risk weighted assets), Actual Amount | 1,334,108 | 1,330,155
Tier 1 capital (to average assets), Actual Amount | $ 1,158,308 | $ 1,164,652
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 10.599% | 11.323%
Tier 1 capital (to risk weighted assets), Actual Ratio | 10.599% | 11.323%
Total capital (to risk weighted assets), Actual Ratio | 12.207% | 12.933%
Tier 1 capital (to average assets), Actual Ratio | 9.992% | 10.379%
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 491,793 | $ 462,842
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 655,724 | 617,122
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 874,298 | 822,829
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 463,680 | $ 448,851
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 | 6.00% | 6.00%
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 8.00% | 8.00%
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 | $ 710,368 | $ 668,549
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 874,298 | 822,829
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,092,873 | 1,028,537
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 579,600 | $ 561,064
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 | $ 765,011 | $ 719,976
Tier 1 (to risk weighted assets) Required for Basel III amount | 928,942 | 874,256
Total capital (to risk weighted assets), for Basel III amount | 1,147,517 | 1,079,964
Tier 1 (to risk average assets), for Basel III amount | $ 463,680 | $ 448,851
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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