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Regulatory Capital - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |
Common equity Tier 1 capital (to risk weighted assets), Actual Amount | $ 853,818 | $ 821,810
Tier 1 capital (to risk weighted assets), Actual Amount | 1,071,289 | 1,039,281
Total capital (to risk weighted assets), Actual Amount | 1,311,527 | 1,256,309
Tier 1 capital (to average assets), Actual Amount | $ 1,071,289 | $ 1,039,281
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 7.765% | 7.984%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.09743 | 0.10096
Total capital (to risk weighted assets), Actual Ratio | 0.11928 | 0.12205
Tier 1 capital (to average assets), Actual Ratio | 0.08790 | 0.09258
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 494,780 | $ 463,211
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 659,706 | 617,615
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 879,608 | 823,487
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 487,512 | $ 449,026
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 | $ 769,657 | $ 720,551
Tier 1 (to risk weighted assets) Required for Basel III amount | 934,584 | 874,955
Total capital (to risk weighted assets), for Basel III amount | 1,154,486 | 1,080,827
Tier 1 (to risk average assets), for Basel III amount | $ 487,512 | $ 449,026
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 capital (to risk weighted assets), Actual Amount | $ 1,168,276 | $ 1,164,652
Tier 1 capital (to risk weighted assets), Actual Amount | 1,168,276 | 1,164,652
Total capital (to risk weighted assets), Actual Amount | 1,351,665 | 1,330,155
Tier 1 capital (to average assets), Actual Amount | $ 1,168,276 | $ 1,164,652
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 10.636% | 11.323%
Tier 1 capital (to risk weighted assets), Actual Ratio | 0.10636 | 0.11323
Total capital (to risk weighted assets), Actual Ratio | 0.12305 | 0.12933
Tier 1 capital (to average assets), Actual Ratio | 0.09593 | 0.10379
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 494,291 | $ 462,842
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 659,055 | 617,122
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 878,740 | 822,829
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 487,151 | $ 448,851
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 Capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 713,976 | $ 668,549
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 878,740 | 822,829
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,098,424 | 1,028,537
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 608,938 | $ 561,064
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 | $ 768,897 | $ 719,976
Tier 1 (to risk weighted assets) Required for Basel III amount | 933,661 | 874,256
Total capital (to risk weighted assets), for Basel III amount | 1,153,346 | 1,079,964
Tier 1 (to risk average assets), for Basel III amount | $ 487,151 | $ 448,851
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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