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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
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%