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Bank Premises and Equipment - Narrative (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Depreciation, occupancy and amortization of leasehold improvement	$ 2.3	$ 2.2	$ 3.0

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- Definition

Depreciation, Occupancy and Amortization of Leasehold Improvement

+ References

No definition available.

+ Details

Name:	cubi_DepreciationOccupancyandAmortizationofLeaseholdImprovement
Namespace Prefix:	cubi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_PropertyPlantAndEquipmentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration