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Loan Commitments and Other Related Activities (Narrative) (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Contractual Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Period for commitments and construction loan commitments	60 days
Construction [Member]
Contractual Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Period for commitments and construction loan commitments	1 year
Minimum [Member]
Contractual Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Interest rates for fixed rate loan commitments	3.25%cfbk_FixedRateOfInterestOnLoans / us-gaap_RangeAxis = us-gaap_MinimumMember	4.00%cfbk_FixedRateOfInterestOnLoans / us-gaap_RangeAxis = us-gaap_MinimumMember
Maturities for fixed rate loan commitments	18 years	6 months
Maximum [Member]
Contractual Commitments Contingencies And Off Balance Sheet Arrangements [Line Items]
Interest rates for fixed rate loan commitments	5.00%cfbk_FixedRateOfInterestOnLoans / us-gaap_RangeAxis = us-gaap_MaximumMember	5.25%cfbk_FixedRateOfInterestOnLoans / us-gaap_RangeAxis = us-gaap_MaximumMember
Maturities for fixed rate loan commitments	30 years	31 years

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