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Regulatory Capital - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Jan. 01, 2018 | Dec. 31, 2017 | Jan. 01, 2017
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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 | $ 710,156 |  | $ 689,494 |
Tier 1 capital (to risk weighted assets), Actual Amount | 927,627 |  | 906,963 |
Total capital (to risk weighted assets), Actual Amount | 1,047,698 |  | 1,021,601 |
Tier 1 capital (to average assets), Actual Amount | $ 927,627 |  | $ 906,963 |
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 8.508% |  | 8.805% |
Tier 1 capital (to risk weighted assets), Actual Ratio | 11.113% |  | 11.583% |
Total capital (to risk weighted assets), Actual Ratio | 12.552% |  | 13.047% |
Tier 1 capital (to average assets), Actual Ratio | 9.031% |  | 8.937% |
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 375,609 |  | $ 352,368 |
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 500,812 |  | 469,824 |
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 667,749 |  | 626,432 |
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 410,858 |  | $ 405,949 |
Common equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Ratio | 4.50% | 6.375% | 4.50% |
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 6.00% | 7.875% | 6.00% |
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 8.00% | 9.875% | 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 | $ 532,113 |  | $ 450,248 |
Tier 1 (to risk weighted assets) Required for Basel III amount | 657,316 |  | 567,704 |
Total capital (to risk weighted assets), for Basel III amount | 824,253 |  | 724,313 |
Tier 1 (to risk average assets), for Basel III amount | $ 410,858 |  | $ 405,949 |
Common equity Tier 1 (to risk weighted assets), for Basel III ratio | 6.375% |  | 5.75% |
Tier 1 capital (to risk weighted assets), for Basel III ratio | 7.875% |  | 7.25% |
Total capital (to risk weighted assets), for Basel III ratio | 9.875% |  | 9.25% |
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 | $ 1,037,480 |  | $ 1,023,564 |
Tier 1 capital (to risk weighted assets), Actual Amount | 1,037,480 |  | 1,023,564 |
Total capital (to risk weighted assets), Actual Amount | 1,186,105 |  | 1,170,666 |
Tier 1 capital (to average assets), Actual Amount | $ 1,037,480 |  | $ 1,023,564 |
Common equity Tier 1 (to risk weighted assets), Actual Ratio | 12.448% |  | 13.081% |
Tier 1 capital (to risk weighted assets), Actual Ratio | 12.448% |  | 13.081% |
Total capital (to risk weighted assets), Actual Ratio | 14.231% |  | 14.961% |
Tier 1 capital (to average assets), Actual Ratio | 10.107% |  | 10.092% |
Common equity Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | $ 375,048 |  | $ 352,122 |
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 500,064 |  | 469,496 |
Total capital (to risk weighted assets), For Capital Adequacy Purposes Amount | 666,751 |  | 625,994 |
Tier 1 capital (to average assets), For Capital Adequacy Purposes Amount | $ 410,612 |  | $ 405,701 |
Common equity Tier 1 (to risk weighted assets), For Capital Adequacy Purposes Ratio | 4.50% |  | 4.50% | 6.375%
Tier 1 capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 6.00% |  | 6.00% | 7.875%
Total capital (to risk weighted assets), For Capital Adequacy Purposes Ratio | 8.00% |  | 8.00% | 9.875%
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 | $ 541,736 |  | $ 508,621 |
Tier 1 capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 666,751 |  | 625,994 |
Total capital (to risk weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | 833,439 |  | 782,493 |
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount | $ 513,265 |  | $ 507,126 |
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 | $ 531,318 |  | $ 449,934 |
Tier 1 (to risk weighted assets) Required for Basel III amount | 656,333 |  | 567,307 |
Total capital (to risk weighted assets), for Basel III amount | 823,021 |  | 723,806 |
Tier 1 (to risk average assets), for Basel III amount | $ 410,612 |  | $ 405,701 |
Common equity Tier 1 (to risk weighted assets), for Basel III ratio | 6.375% |  | 5.75% |
Tier 1 capital (to risk weighted assets), for Basel III ratio | 7.875% |  | 7.25% |
Total capital (to risk weighted assets), for Basel III ratio | 9.875% |  | 9.25% |
Tier 1 capital (to average assets), for Basel III ratio | 4.00% |  | 4.00% |

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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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- Definition The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 + Details
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