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v3.20.1

Leases - Lessor Narrative (Details) - Equipment | 3 Months Ended
--- | ---
Mar. 31, 2020
Minimum |
Lessor, Lease, Description [Line Items] |
Lessor, lease, term of contract (years) | 24 months
Maximum |
Lessor, Lease, Description [Line Items] |
Lessor, lease, term of contract (years) | 120 months

X
- 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

X
- 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

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

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

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