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Regulatory Capital - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common equity Tier 1 (to risk-weighted-assets), actual amount | $ 1,803,601 | $ 1,661,149
Tier 1 capital (to risk-weighted assets), actual amount | 1,941,394 | 1,798,942
Total capital (to risk-weighted assets), actual amount | 2,219,984 | 2,076,550
Tier 1 capital (to average assets), actual amount | $ 1,941,394 | $ 1,798,942
Common equity Tier 1 (to risk-weighted assets), actual ratio | 12.087% | 12.23%
Tier 1 capital (to risk-weighted assets), actual ratio | 0.13011 | 0.13245
Total capital (to risk-weighted assets), actual ratio | 0.14878 | 0.15289
Tier 1 capital (to average assets), actual ratio | 0.08694 | 0.08375
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount | $ 671,841 | $ 611,200
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount | 895,308 | 814,933
Total capital (to risk-weighted assets), for capital adequacy purposes amount | 1,193,744 | 1,086,578
Tier 1 capital (to average assets), for capital adequacy purposes amount | $ 893,254 | $ 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 | $ 1,044,526 | $ 950,755
Tier 1 (to risk-weighted assets), for Basel III amount | 1,268,353 | 1,154,489
Total capital (to risk-weighted assets), for Basel III amount | 1,566,789 | 1,426,133
Tier 1 capital (to average assets) for Basel III amount | $ 893,254 | $ 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 (to risk-weighted-assets), actual amount | $ 1,930,951 | $ 1,868,360
Tier 1 capital (to risk-weighted assets), actual amount | 1,930,951 | 1,868,360
Total capital (to risk-weighted assets), actual amount | 2,136,594 | 2,073,202
Tier 1 capital (to average assets), actual amount | $ 1,930,951 | $ 1,868,360
Common equity Tier 1 (to risk-weighted assets), actual ratio | 12.955% | 13.773%
Tier 1 capital (to risk-weighted assets), actual ratio | 0.12955 | 0.13773
Total capital (to risk-weighted assets), actual ratio | 0.14335 | 0.15283
Tier 1 capital (to average assets), actual ratio | 0.08652 | 0.08708
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount | $ 670,719 | $ 610,453
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount | 894,292 | 813,937
Total capital (to risk-weighted assets), for capital adequacy purposes amount | 1,192,390 | 1,085,250
Tier 1 capital (to average assets), for capital adequacy purposes amount | $ 892,755 | $ 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 (to risk-weighted assets), to be well capitalized under prompt correction action provisions amount | $ 968,817 | $ 881,765
Tier 1 capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount | 1,192,390 | 1,085,250
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount | 1,490,487 | 1,356,562
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions amount | $ 1,115,944 | $ 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 | $ 1,043,341 | $ 949,594
Tier 1 (to risk-weighted assets), for Basel III amount | 1,266,914 | 1,153,078
Total capital (to risk-weighted assets), for Basel III amount | 1,565,012 | 1,424,390
Tier 1 capital (to average assets) for Basel III amount | $ 892,755 | $ 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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