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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, 2023
Dec. 31, 2022
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Common equity Tier 1 (to risk-weighted-assets), actual amount $ 1,661,149 $ 1,470,837
Tier 1 capital (to risk-weighted assets), actual amount 1,798,942 1,608,630
Total capital (to risk-weighted assets), actual amount 2,076,550 1,862,089
Tier 1 capital (to average assets), actual amount $ 1,798,942 $ 1,608,630
Common equity Tier 1 (to risk-weighted assets), actual ratio 12.23% 9.637%
Tier 1 capital (to risk-weighted assets), actual ratio 0.13245 0.10539
Total capital (to risk-weighted assets), actual ratio 0.15289 0.12200
Tier 1 capital (to average assets), actual ratio 0.08375 0.07664
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount $ 611,200 $ 686,838
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount 814,933 915,784
Total capital (to risk-weighted assets), for capital adequacy purposes amount 1,086,578 1,221,045
Tier 1 capital (to average assets), for capital adequacy purposes amount $ 859,189 $ 839,547
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 $ 950,755 $ 1,068,415
Tier 1 (to risk-weighted assets), for Basel III amount 1,154,489 1,297,361
Total capital (to risk-weighted assets), for Basel III amount 1,426,133 1,602,622
Tier 1 capital (to average assets) for Basel III amount $ 859,189 $ 839,547
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 $ 1,868,360 $ 1,708,598
Tier 1 capital (to risk-weighted assets), actual amount 1,868,360 1,708,598
Total capital (to risk-weighted assets), actual amount 2,073,202 1,889,472
Tier 1 capital (to average assets), actual amount $ 1,868,360 $ 1,708,598
Common equity Tier 1 (to risk-weighted assets), actual ratio 13.773% 11.213%
Tier 1 capital (to risk-weighted assets), actual ratio 0.13773 0.11213
Total capital (to risk-weighted assets), actual ratio 0.15283 0.12400
Tier 1 capital (to average assets), actual ratio 0.08708 0.08150
Common equity Tier 1 (to risk-weighted assets), for capital adequacy purposes amount $ 610,453 $ 685,694
Tier 1 capital (to risk-weighted assets), for capital adequacy purposes amount 813,937 914,259
Total capital (to risk-weighted assets), for capital adequacy purposes amount 1,085,250 1,219,012
Tier 1 capital (to average assets), for capital adequacy purposes amount $ 858,225 $ 838,611
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 $ 881,765 $ 990,447
Tier 1 capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount 1,085,250 1,219,012
Total capital (to risk-weighted assets), to be well capitalized under prompt corrective action provisions amount 1,356,562 1,523,765
Tier 1 capital (to average assets), to be well capitalized under prompt corrective action provisions amount $ 1,072,782 $ 1,048,264
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 $ 949,594 $ 1,066,636
Tier 1 (to risk-weighted assets), for Basel III amount 1,153,078 1,295,201
Total capital (to risk-weighted assets), for Basel III amount 1,424,390 1,599,954
Tier 1 capital (to average assets) for Basel III amount $ 858,225 $ 838,611
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%