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v3.20.2

Leases - Lessor Narrative (Details) $ in Millions | 6 Months Ended
--- | ---
Jun. 30, 2020 USD ($)
Minimum | Equipment |
Lessor, Lease, Description [Line Items] |
Lessor, lease, term of contract (years) | 24 months
Maximum | Equipment |
Lessor, Lease, Description [Line Items] |
Lessor, lease, term of contract (years) | 120 months
COVID-19 | Finance Leases |
Lessor, Lease, Description [Line Items] |
Book value | $ 31.7
COVID-19 | Operating Leases |
Lessor, Lease, Description [Line Items] |
Book value | $ 16.7

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- Definition Lessor, Book Value of Leases With Payment Deferments + References No definition available. + Details
Name: | cubi_LessorBookValueOfLeasesWithPaymentDeferments
Namespace Prefix: | cubi_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Lessor, Lease, Term of Contract + References No definition available. + Details
Name: | cubi_LessorLeaseTermofContract
Namespace Prefix: | cubi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LessorLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_UnusualRiskOrUncertaintyByNatureAxis=cubi_COVID19Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cubi_LeaseTypeAxis=cubi_FinanceLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | cubi_LeaseTypeAxis=cubi_OperatingLeaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |