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Foreclosed Assets (Activity In Valuation Allowance) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013
Disclosure Foreclosed Assets Activity In Valuation Allowance [Abstract] |  |  |
Beginning of the year |  |  |
Additions charged to expense | 962 cfbk_AdditionsChargedToExpenseInValuationAllowance |  |
Direct write downs | (2,101)cfbk_DirectWriteDownsToValuationAllowance |  |
End of year |  |  |

X
- Definition Additions charged to expense in valuation allowance. + References No definition available. + Details
Name: | cfbk_AdditionsChargedToExpenseInValuationAllowance
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Direct write downs to valuation allowance. + References No definition available. + Details
Name: | cfbk_DirectWriteDownsToValuationAllowance
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | cfbk_DisclosureForeclosedAssetsActivityInValuationAllowanceAbstract
Namespace Prefix: | cfbk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Valuation allowance on foreclosed asset. + References No definition available. + Details
Name: | cfbk_ValuationAllowanceOnForeclosedAsset
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant