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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, 2022 | Dec. 31, 2021
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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 | $ 1,344,684 | $ 1,291,270
Tier 1 capital (to risk weighted assets), Actual Amount | 1,482,477 | 1,429,063
Total capital (to risk weighted assets), Actual Amount | 1,749,655 | 1,667,395
Tier 1 capital (to average assets), Actual Amount | $ 1,482,477 | $ 1,429,063
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 9.893% | 9.981%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.10907 | 0.11046
Total capital (to risk weighted assets), Actual Ratio | 0.12873 | 0.12888
Tier 1 capital (to average assets), Actual Ratio | 0.07723 | 0.07413
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 611,629 | $ 582,179
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 815,505 | 776,238
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 1,087,340 | 1,034,984
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 767,836 | $ 771,084
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 | $ 951,423 | $ 905,611
Tier 1 (to risk weighted assets) Required for Basel III amount | 1,155,299 | 1,099,671
Total capital (to risk weighted assets), for Basel III amount | 1,427,134 | 1,358,417
Tier 1 (to risk average assets), for Basel III amount | $ 767,836 | $ 771,084
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 | $ 1,573,796 | $ 1,526,583
Tier 1 capital (to risk weighted assets), Actual Amount | 1,573,796 | 1,526,583
Total capital (to risk weighted assets), Actual Amount | 1,768,525 | 1,692,512
Tier 1 capital (to average assets), Actual Amount | $ 1,573,796 | $ 1,526,583
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 11.598% | 11.825%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.11598 | 0.11825
Total capital (to risk weighted assets), Actual Ratio | 0.13032 | 0.13110
Tier 1 capital (to average assets), Actual Ratio | 0.08211 | 0.07925
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 610,658 | $ 580,943
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 814,211 | 774,591
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 1,085,615 | 1,032,788
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 766,712 | $ 770,528
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 | $ 882,062 | $ 839,140
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,085,615 | 1,032,788
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,357,019 | 1,290,985
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 958,391 | $ 963,160
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 | $ 949,913 | $ 903,689
Tier 1 (to risk weighted assets) Required for Basel III amount | 1,153,466 | 1,097,337
Total capital (to risk weighted assets), for Basel III amount | 1,424,870 | 1,355,534
Tier 1 (to risk average assets), for Basel III amount | $ 766,712 | $ 770,528
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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