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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, 2022
Dec. 31, 2021
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 (to risk-weighted-assets), actual amount $ 1,470,837 $ 1,291,270
Tier 1 capital (to risk-weighted assets), actual amount 1,608,630 1,429,063
Total capital (to risk-weighted assets), actual amount 1,862,089 1,667,395
Tier 1 capital (to average assets), actual amount $ 1,608,630 $ 1,429,063
Common equity Tier 1 (to risk-weighted assets), actual ratio 9.637% 9.981%
Tier 1 capital (to risk-weighted assets), actual ratio 0.10539 0.11046
Total capital (to risk-weighted assets), actual ratio 0.12200 0.12888
Tier 1 capital (to average assets), actual ratio 0.07664 0.07413
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount $ 686,838 $ 582,179
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount 915,784 776,238
Total capital (to risk-weighted assets), for capital adequacy purposes amount 1,221,045 1,034,984
Tier 1 capital (to average assets), for capital adequacy purposes amount $ 839,547 $ 771,084
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 $ 1,068,415 $ 905,611
Tier 1 (to risk-weighted assets), for Basel III amount 1,297,361 1,099,671
Total capital (to risk-weighted assets), for Basel III amount 1,602,622 1,358,417
Tier 1 capital (to average assets) for Basel III amount $ 839,547 $ 771,084
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 $ 1,708,598 $ 1,526,583
Tier 1 capital (to risk-weighted assets), actual amount 1,708,598 1,526,583
Total capital (to risk-weighted assets), actual amount 1,889,472 1,692,512
Tier 1 capital (to average assets), actual amount $ 1,708,598 $ 1,526,583
Common equity Tier 1 (to risk-weighted assets), actual ratio 11.213% 11.825%
Tier 1 capital (to risk-weighted assets), actual ratio 0.11213 0.11825
Total capital (to risk-weighted assets), actual ratio 0.12400 0.13110
Tier 1 capital (to average assets), actual ratio 0.08150 0.07925
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount $ 685,694 $ 580,943
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount 914,259 774,591
Total capital (to risk-weighted assets), for capital adequacy purposes amount 1,219,012 1,032,788
Tier 1 capital (to average assets), for capital adequacy purposes amount $ 838,611 $ 770,528
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 $ 990,447 $ 839,140
Tier 1 capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount 1,219,012 1,032,788
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount 1,523,765 1,290,985
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions amount $ 1,048,264 $ 963,160
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 $ 1,066,636 $ 903,689
Tier 1 (to risk-weighted assets), for Basel III amount 1,295,201 1,097,337
Total capital (to risk-weighted assets), for Basel III amount 1,599,954 1,355,534
Tier 1 capital (to average assets) for Basel III amount $ 838,611 $ 770,528
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%