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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, 2023 | Dec. 31, 2022
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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 | $ 1,596,157 | $ 1,470,837
Tier 1 capital (to risk weighted assets), Actual Amount | 1,733,950 | 1,608,630
Total capital (to risk weighted assets), Actual Amount | 2,015,526 | 1,862,089
Tier 1 capital (to average assets), Actual Amount | $ 1,733,950 | $ 1,608,630
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 11.305% | 9.637%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.12281 | 0.10539
Total capital (to risk weighted assets), Actual Ratio | 0.14275 | 0.12200
Tier 1 capital (to average assets), Actual Ratio | 0.07805 | 0.07664
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 635,353 | $ 686,838
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 847,137 | 915,784
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 1,129,516 | 1,221,045
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 888,675 | $ 839,547
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 | $ 988,327 | $ 1,068,415
Tier 1 (to risk weighted assets) Required for Basel III amount | 1,200,111 | 1,297,361
Total capital (to risk weighted assets), for Basel III amount | 1,482,490 | 1,602,622
Tier 1 (to risk average assets), for Basel III amount | $ 888,675 | $ 839,547
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 | $ 1,830,143 | $ 1,708,598
Tier 1 capital (to risk weighted assets), Actual Amount | 1,830,143 | 1,708,598
Total capital (to risk weighted assets), Actual Amount | 2,038,998 | 1,889,472
Tier 1 capital (to average assets), Actual Amount | $ 1,830,143 | $ 1,708,598
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 12.974% | 11.213%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.12974 | 0.11213
Total capital (to risk weighted assets), Actual Ratio | 0.14455 | 0.12400
Tier 1 capital (to average assets), Actual Ratio | 0.08246 | 0.08150
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 634,762 | $ 685,694
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 846,349 | 914,259
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 1,128,466 | 1,219,012
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 887,727 | $ 838,611
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 | $ 916,878 | $ 990,447
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,128,466 | 1,219,012
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,410,582 | 1,523,765
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 1,109,658 | $ 1,048,264
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 | $ 987,408 | $ 1,066,636
Tier 1 (to risk weighted assets) Required for Basel III amount | 1,198,995 | 1,295,201
Total capital (to risk weighted assets), for Basel III amount | 1,481,111 | 1,599,954
Tier 1 (to risk average assets), for Basel III amount | $ 887,727 | $ 838,611
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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