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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, 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 | $ 1,777,683 | $ 1,661,149
Tier 1 capital (to risk weighted assets), Actual Amount | 1,915,476 | 1,798,942
Total capital (to risk weighted assets), Actual Amount | 2,191,266 | 2,076,550
Tier 1 capital (to average assets), Actual Amount | $ 1,915,476 | $ 1,798,942
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 12.463% | 12.23%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.13429 | 0.13245
Total capital (to risk weighted assets), Actual Ratio | 0.15362 | 0.15289
Tier 1 capital (to average assets), Actual Ratio | 0.08947 | 0.08375
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 641,885 | $ 611,200
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 855,847 | 814,933
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 1,141,129 | 1,086,578
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 856,386 | $ 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 | $ 998,488 | $ 950,755
Tier 1 (to risk weighted assets) Required for Basel III amount | 1,212,450 | 1,154,489
Total capital (to risk weighted assets), for Basel III amount | 1,497,732 | 1,426,133
Tier 1 (to risk average assets), for Basel III amount | $ 856,386 | $ 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 | $ 1,943,059 | $ 1,868,360
Tier 1 capital (to risk weighted assets), Actual Amount | 1,943,059 | 1,868,360
Total capital (to risk weighted assets), Actual Amount | 2,145,947 | 2,073,202
Tier 1 capital (to average assets), Actual Amount | $ 1,943,059 | $ 1,868,360
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 13.636% | 13.773%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.13636 | 0.13773
Total capital (to risk weighted assets), Actual Ratio | 0.15060 | 0.15283
Tier 1 capital (to average assets), Actual Ratio | 0.09082 | 0.08708
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 641,212 | $ 610,453
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 854,949 | 813,937
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 1,139,932 | 1,085,250
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 855,807 | $ 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 | $ 926,125 | $ 881,765
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,139,932 | 1,085,250
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,424,916 | 1,356,562
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 1,069,759 | $ 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 | $ 997,441 | $ 949,594
Tier 1 (to risk weighted assets) Required for Basel III amount | 1,211,178 | 1,153,078
Total capital (to risk weighted assets), for Basel III amount | 1,496,161 | 1,424,390
Tier 1 (to risk average assets), for Basel III amount | $ 855,807 | $ 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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