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v3.20.1

Loan Servicing (Tables) | 12 Months Ended
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Dec. 31, 2019
Loan Servicing [Abstract] |
Principal Balances Of Mortgage Loans At Year-End |
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﻿ | December 31, 2019 |  | December 31, 2018
﻿Mortgage loans serviced for Freddie Mac | $ | 2,649 |  | $ | 2,999
﻿

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- Definition Schedule Of Mortgage Loan Activity [Table Text Block] + References No definition available. + Details
Name: | cfbk_ScheduleOfMortgageLoanActivityTableTextBlock
Namespace Prefix: | cfbk_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TransfersAndServicingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration