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Regulatory Capital - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
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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 | $ 794,745 |  | $ 745,795
Tier 1 capital (to risk weighted assets), Actual Amount | 1,012,216 |  | 963,266
Total capital (to risk weighted assets), Actual Amount | 1,155,499 |  | 1,081,962
Tier 1 capital (to average assets), Actual Amount | $ 1,012,216 |  | $ 963,266
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 7.811% |  | 8.964%
Tier 1 capital (to risk weighted assets), Actual Ratio | 9.949% |  | 11.578%
Total capital (to risk weighted assets), Actual Ratio | 11.357% |  | 13.005%
Tier 1 capital (to average assets), Actual Ratio | 9.013% |  | 9.665%
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 457,840 |  | $ 374,388
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 610,453 |  | 499,185
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 813,938 |  | 665,580
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 449,217 |  | $ 398,668
Common equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Ratio | 4.50% | 7.00% | 4.50%
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 6.00% | 8.50% | 6.00%
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 8.00% | 10.50% | 8.00%
Tier 1 capital (to average assets), For Capital Adequacy Purposes Ratio | 4.00% |  | 4.00%
Common equity Tier 1 (to risk weighted assets), for Basel III amount | $ 712,195 |  | $ 530,384
Tier 1 (to risk weighted assets) Required for Basel III amount | 864,809 |  | 655,180
Total capital (to risk weighted assets), for Basel III amount | 1,068,293 |  | 821,575
Tier 1 (to risk average assets), for Basel III amount | $ 449,217 |  | $ 398,668
Common equity Tier 1 (to risk weighted assets), for Basel III ratio | 7.00% |  | 6.375%
Tier 1 capital (to risk weighted assets), for Basel III ratio | 8.50% |  | 7.875%
Total capital (to risk weighted assets), for Basel III ratio | 10.50% |  | 9.875%
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 | $ 1,103,341 |  | $ 1,066,121
Tier 1 capital (to risk weighted assets), Actual Amount | 1,103,341 |  | 1,066,121
Total capital (to risk weighted assets), Actual Amount | 1,263,490 |  | 1,215,522
Tier 1 capital (to average assets), Actual Amount | $ 1,103,341 |  | $ 1,066,121
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 10.847% |  | 12.822%
Tier 1 capital (to risk weighted assets), Actual Ratio | 10.847% |  | 12.822%
Total capital (to risk weighted assets), Actual Ratio | 12.421% |  | 14.619%
Tier 1 capital (to average assets), Actual Ratio | 9.829% |  | 10.699%
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 457,748 |  | $ 374,160
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 610,331 |  | 498,879
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 813,775 |  | 665,173
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 448,997 |  | $ 398,570
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 | 6.00% |  | 6.00%
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 8.00% |  | 8.00%
Tier 1 capital (to average assets), For Capital Adequacy Purposes Ratio | 4.00% |  | 4.00%
Common equity Tier 1 Capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 661,192 |  | $ 540,453
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 813,775 |  | 665,173
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 1,017,218 |  | 831,466
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 561,246 |  | $ 498,212
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 | 8.00% |  | 8.00%
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 10.00% |  | 10.00%
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio | 5.00% |  | 5.00%
Common equity Tier 1 (to risk weighted assets), for Basel III amount | $ 712,053 |  | $ 530,059
Tier 1 (to risk weighted assets) Required for Basel III amount | 864,636 |  | 654,779
Total capital (to risk weighted assets), for Basel III amount | 1,068,079 |  | 821,072
Tier 1 (to risk average assets), for Basel III amount | $ 448,997 |  | $ 398,570
Common equity Tier 1 (to risk weighted assets), for Basel III ratio | 7.00% |  | 6.375%
Tier 1 capital (to risk weighted assets), for Basel III ratio | 8.50% |  | 7.875%
Total capital (to risk weighted assets), for Basel III ratio | 10.50% |  | 9.875%
Tier 1 capital (to average assets), for Basel III ratio | 4.00% |  | 4.00%

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