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Loan Servicing (Tables) | 12 Months Ended
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Dec. 31, 2016
Loan Servicing [Abstract] |
Principal Balances of Mortgage Loans at Year-End |
﻿ |  |  |  |  |
﻿ | December 31, 2016 |  | December 31, 2015
﻿Mortgage loans serviced for Freddie Mac | $ | 4,261 |  | $ | 5,593
﻿

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

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