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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, 2024 | Dec. 31, 2023
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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 | $ 1,695,246 | $ 1,661,149
Tier 1 capital (to risk weighted assets), Actual Amount | 1,833,039 | 1,798,942
Total capital (to risk weighted assets), Actual Amount | 2,129,343 | 2,076,550
Tier 1 capital (to average assets), Actual Amount | $ 1,833,039 | $ 1,798,942
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 12.622% | 12.23%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.13648 | 0.13245
Total capital (to risk weighted assets), Actual Ratio | 0.15854 | 0.15289
Tier 1 capital (to average assets), Actual Ratio | 0.08512 | 0.08375
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 604,410 | $ 611,200
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 805,880 | 814,933
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 1,074,506 | 1,086,578
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 861,350 | $ 859,189
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 | $ 940,193 | $ 950,755
Tier 1 (to risk weighted assets) Required for Basel III amount | 1,141,663 | 1,154,489
Total capital (to risk weighted assets), for Basel III amount | 1,410,290 | 1,426,133
Tier 1 (to risk average assets), for Basel III amount | $ 861,350 | $ 859,189
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 | $ 1,898,686 | $ 1,868,360
Tier 1 capital (to risk weighted assets), Actual Amount | 1,898,686 | 1,868,360
Total capital (to risk weighted assets), Actual Amount | 2,122,179 | 2,073,202
Tier 1 capital (to average assets), Actual Amount | $ 1,898,686 | $ 1,868,360
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 14.155% | 13.773%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.14155 | 0.13773
Total capital (to risk weighted assets), Actual Ratio | 0.15822 | 0.15283
Tier 1 capital (to average assets), Actual Ratio | 0.08824 | 0.08708
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 603,597 | $ 610,453
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 804,797 | 813,937
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 1,073,062 | 1,085,250
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 860,686 | $ 858,225
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 | $ 871,863 | $ 881,765
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,073,062 | 1,085,250
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,341,328 | 1,356,562
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 1,075,857 | $ 1,072,782
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 | $ 938,929 | $ 949,594
Tier 1 (to risk weighted assets) Required for Basel III amount | 1,140,128 | 1,153,078
Total capital (to risk weighted assets), for Basel III amount | 1,408,394 | 1,424,390
Tier 1 (to risk average assets), for Basel III amount | $ 860,686 | $ 858,225
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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