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Foreclosed Assets (Narrative) (Details) - property | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Multi-Family Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Number of Properties transferred into REO |  | 1
Single-Family Mortgage Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Number of Properties transferred into REO | 0 |

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- Definition Number Of Properties Transferred Into Real Estate Owned + 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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |