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Regulatory Capital - Narrative (Details)	Sep. 30, 2021
Regulatory Capital [Abstract]
Capital conservation buffer to risk weighted assets	2.50%

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- Definition

Capital Conservation Buffer to Risk Weighted Assets, Year Four and Thereafter

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No definition available.

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Balance Type:	na
Period Type:	instant

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- Definition

Regulatory Capital

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No definition available.

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Namespace Prefix:	cubi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration