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Regulatory Matters - Summary of Capital Amounts, Tier 1 Risk Based and Tier 1 Leveraged Ratios (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Customers Bancorp, Inc.    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual Amount $ 578,644us-gaap_Capital
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
$ 411,527us-gaap_Capital
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Tier 1 capital (to risk-weighted assets), Actual Amount 437,712us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
387,529us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Tier 1 capital (to average assets), Actual Amount 437,712us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
387,529us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Total capital (to risk-weighted assets), Actual Ratio 11.09%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
13.21%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Tier 1 capital (to risk-weighted assets), Actual Ratio 8.39%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
12.44%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Tier 1 capital (to average assets), Actual Ratio 6.69%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
10.11%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Total capital (to risk-weighted assets), for Capital Adequacy Purposes Amount 417,473us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
249,196us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Tier 1 capital (to risk-weighted assets), for Capital Adequacy Purposes Amount 208,737us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
124,598us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Tier 1 capital (to average assets), for Capital Adequacy Purposes Amount 261,622us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
153,310us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Total capital (to risk-weighted assets), For Capital Adequacy Purposes Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Tier 1 capital (to risk-weighted assets), For Capital Adequacy Purposes Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Tier 1 capital (to average assets), For Capital Adequacy Purposes Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= cubi_CustomersBancorpIncMember
Customers Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital (to risk-weighted assets), Actual Amount 621,894us-gaap_Capital
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
435,432us-gaap_Capital
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to risk-weighted assets), Actual Amount 480,963us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
411,434us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to average assets), Actual Amount 480,963us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
411,434us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Total capital (to risk-weighted assets), Actual Ratio 11.98%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
14.11%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to risk-weighted assets), Actual Ratio 9.27%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
13.33%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to average assets), Actual Ratio 7.39%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
10.81%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Total capital (to risk-weighted assets), for Capital Adequacy Purposes Amount 415,141us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
246,936us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to risk-weighted assets), for Capital Adequacy Purposes Amount 207,570us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
123,468us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to average assets), for Capital Adequacy Purposes Amount 260,462us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
152,191us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Total capital (to risk-weighted assets), For Capital Adequacy Purposes Ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to risk-weighted assets), For Capital Adequacy Purposes Ratio 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to average assets), For Capital Adequacy Purposes Ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Total capital (to risk-weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 518,926us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
308,670us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to risk-weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount 311,356us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
185,202us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Amount $ 325,577us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
$ 190,239us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Total capital (to risk-weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to risk-weighted assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
Tier 1 capital (to average assets), To Be Well Capitalized Under Prompt Corrective Action Provisions Ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember
5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= cubi_CustomersBankMember