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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
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common equity Tier 1 (to risk-weighted-assets), actual amount | $ 1,470,837 | $ 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%

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