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Deposits - Narrative (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Deposit [Abstract] |  |
Time deposits greater than $250,000 | $ 259.0 | $ 297.7
Brokered demand deposits | 1,700.0 | 605.6
Brokered money market deposits | 480.5 | 1,100.0
Brokered certificates of deposit | 0.0 | 47.0
Demand deposit overdrafts reclassified as loans | $ 2.8 | $ 6.7

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- Definition Brokered Demand Deposits + References No definition available. + Details
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Balance Type: | credit
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- Definition Amount of brokered money market accounts. + References No definition available. + Details
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Namespace Prefix: | cubi_
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- Definition Certificates of deposit brokered. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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- Definition Deposit + References No definition available. + Details
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Namespace Prefix: | cubi_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of deposits held by the entity that have been reclassified as loan balances receivable, for example, but not limited to, overdrafts receivable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
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