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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
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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%

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