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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, 2020
Dec. 31, 2019
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 (to risk-weighted-assets), actual amount $ 954,839 $ 821,810
Tier 1 capital (to risk-weighted assets), actual amount 1,172,310 1,039,281
Total capital (to risk-weighted assets), actual amount 1,401,119 1,256,309
Tier 1 capital (to average assets), actual amount $ 1,172,310 $ 1,039,281
Common equity Tier 1 (to risk-weighted assets), actual ratio 8.079% 7.984%
Tier 1 capital (to risk-weighted assets), actual ratio 0.09919 0.10096
Total capital (to risk-weighted assets), actual ratio 0.11855 0.12205
Tier 1 capital (to average assets), actual ratio 0.08597 0.09258
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount $ 531,844 $ 463,211
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount 709,125 617,615
Total capital (to risk-weighted assets), for capital adequacy purposes amount 945,500 823,487
Tier 1 capital (to average assets), for capital adequacy purposes amount $ 545,485 $ 449,026
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 $ 827,312 $ 720,551
Tier 1 (to risk-weighted assets), for Basel III amount 1,004,594 874,955
Total capital (to risk-weighted assets), for Basel III amount 1,240,969 1,080,827
Tier 1 capital (to average assets) for Basel III amount $ 545,485 $ 449,026
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 $ 1,254,082 $ 1,164,652
Tier 1 capital (to risk-weighted assets), actual amount 1,254,082 1,164,652
Total capital (to risk-weighted assets), actual amount 1,424,791 1,330,155
Tier 1 capital (to average assets), actual amount $ 1,254,082 $ 1,164,652
Common equity Tier 1 (to risk-weighted assets), actual ratio 10.615% 11.323%
Tier 1 capital (to risk-weighted assets), actual ratio 0.10615 0.11323
Total capital (to risk-weighted assets), actual ratio 0.12060 0.12933
Tier 1 capital (to average assets), actual ratio 0.09208 0.10379
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount $ 531,639 $ 462,842
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount 708,852 617,122
Total capital (to risk-weighted assets), for capital adequacy purposes amount 945,136 822,829
Tier 1 capital (to average assets), for capital adequacy purposes amount $ 544,758 $ 448,851
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 $ 767,923 $ 668,549
Tier 1 capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount 945,136 822,829
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount 1,181,421 1,028,537
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions amount $ 680,947 $ 561,064
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 $ 826,994 $ 719,976
Tier 1 (to risk-weighted assets), for Basel III amount 1,004,207 874,256
Total capital (to risk-weighted assets), for Basel III amount 1,240,492 1,079,964
Tier 1 capital (to average assets) for Basel III amount $ 544,758 $ 448,851
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%