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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
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%