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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, 2021 | Dec. 31, 2020
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common equity Tier 1 (to risk-weighted-assets), actual amount | $ 1,291,270 | $ 954,839
Tier 1 capital (to risk-weighted assets), actual amount | 1,429,063 | 1,172,310
Total capital (to risk-weighted assets), actual amount | 1,667,395 | 1,401,119
Tier 1 capital (to average assets), actual amount | $ 1,429,063 | $ 1,172,310
Common equity Tier 1 (to risk-weighted assets), actual ratio | 9.981% | 8.079%
Tier 1 capital (to risk-weighted assets), actual ratio | 0.11046 | 0.09919
Total capital (to risk-weighted assets), actual ratio | 0.12888 | 0.11855
Tier 1 capital (to average assets), actual ratio | 0.07413 | 0.08597
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount | $ 582,179 | $ 531,844
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount | 776,238 | 709,125
Total capital (to risk-weighted assets), for capital adequacy purposes amount | 1,034,984 | 945,500
Tier 1 capital (to average assets), for capital adequacy purposes amount | $ 771,084 | $ 545,485
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 | $ 905,611 | $ 827,312
Tier 1 (to risk-weighted assets), for Basel III amount | 1,099,671 | 1,004,594
Total capital (to risk-weighted assets), for Basel III amount | 1,358,417 | 1,240,969
Tier 1 capital (to average assets) for Basel III amount | $ 771,084 | $ 545,485
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 | $ 1,526,583 | $ 1,254,082
Tier 1 capital (to risk-weighted assets), actual amount | 1,526,583 | 1,254,082
Total capital (to risk-weighted assets), actual amount | 1,692,512 | 1,424,791
Tier 1 capital (to average assets), actual amount | $ 1,526,583 | $ 1,254,082
Common equity Tier 1 (to risk-weighted assets), actual ratio | 11.825% | 10.615%
Tier 1 capital (to risk-weighted assets), actual ratio | 0.11825 | 0.10615
Total capital (to risk-weighted assets), actual ratio | 0.13110 | 0.12060
Tier 1 capital (to average assets), actual ratio | 0.07925 | 0.09208
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount | $ 580,943 | $ 531,639
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount | 774,591 | 708,852
Total capital (to risk-weighted assets), for capital adequacy purposes amount | 1,032,788 | 945,136
Tier 1 capital (to average assets), for capital adequacy purposes amount | $ 770,528 | $ 544,758
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 | $ 839,140 | $ 767,923
Tier 1 capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount | 1,032,788 | 945,136
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount | 1,290,985 | 1,181,421
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions amount | $ 963,160 | $ 680,947
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 | $ 903,689 | $ 826,994
Tier 1 (to risk-weighted assets), for Basel III amount | 1,097,337 | 1,004,207
Total capital (to risk-weighted assets), for Basel III amount | 1,355,534 | 1,240,492
Tier 1 capital (to average assets) for Basel III amount | $ 770,528 | $ 544,758
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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