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Consolidated Statements Of Changes In Stockholders' Equity (USD $)
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income
Treasury Stock
Series A Preferred Stock [Member]
Series B Preferred Stock [Member]
Total
Balance at Dec. 31, 2011 $ 9,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
$ 27,837,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
$ (22,163,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
$ 386,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
$ (3,245,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
$ 7,120,000us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
  $ 9,944,000us-gaap_StockholdersEquity
Net income (loss)     (3,766,000)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
        (3,766,000)us-gaap_NetIncomeLoss
Other comprehensive income (loss)       (279,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
      (279,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Accretion of discount on preferred stock     (39,000)us-gaap_AccretionOfDiscount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    39,000us-gaap_AccretionOfDiscount
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
   
Release of 100 stock-based incentive plan shares, net of forfeitures   4,000cfbk_ReleaseOfStockBasedIncentivePlanValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
          4,000cfbk_ReleaseOfStockBasedIncentivePlanValue
Stock option expense, net of forfeitures   7,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
          7,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Cash dividends declared on Series B preferred stock     (289,000)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
        (289,000)us-gaap_DividendsPreferredStockCash
Redemption of TARP obligations, including $801 accrued dividends     4,960,000us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
    (7,159,000)us-gaap_StockRedeemedOrCalledDuringPeriodValue
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesAPreferredStockMember
  (2,199,000)us-gaap_StockRedeemedOrCalledDuringPeriodValue
Issuance of shares 150,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
20,071,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
          20,221,000us-gaap_StockIssuedDuringPeriodValueNewIssues
Balance at Dec. 31, 2012 159,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
47,919,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(21,297,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
107,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(3,245,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
    23,643,000us-gaap_StockholdersEquity
Net income (loss)     (918,000)us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
        (918,000)us-gaap_NetIncomeLoss
Other comprehensive income (loss)       (9,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
      (9,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Release of 100 stock-based incentive plan shares, net of forfeitures   (6,000)cfbk_ReleaseOfStockBasedIncentivePlanValue
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
          (6,000)cfbk_ReleaseOfStockBasedIncentivePlanValue
Stock option expense, net of forfeitures   165,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
          165,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Offering costs associated with issuance of common stock   (11,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
          (11,000)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockIssuedIssuanceCosts
Balance at Dec. 31, 2013 159,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
48,067,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(22,215,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
98,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(3,245,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
    22,864,000us-gaap_StockholdersEquity
Net income (loss)     479,000us-gaap_NetIncomeLoss
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
        479,000us-gaap_NetIncomeLoss
Other comprehensive income (loss)       (47,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
      (47,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax
Stock option expense, net of forfeitures   265,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
          265,000us-gaap_AdjustmentsToAdditionalPaidInCapitalShareBasedCompensationStockOptionsRequisiteServicePeriodRecognition
Cash dividends declared on Series B preferred stock     (421,000)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
        (421,000)us-gaap_DividendsPreferredStockCash
Issuance of shares   11,364,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
        5,000us-gaap_StockIssuedDuringPeriodValueNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
11,369,000us-gaap_StockIssuedDuringPeriodValueNewIssues
Balance at Dec. 31, 2014 159,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
59,696,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(22,157,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
51,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AccumulatedOtherComprehensiveIncomeMember
(3,245,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
  5,000us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
34,509,000us-gaap_StockholdersEquity
Balance at Sep. 30, 2014                
Cash dividends declared on Series B preferred stock             (187,500)us-gaap_DividendsPreferredStockCash
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember
 
Balance at Dec. 31, 2014 $ 159,000us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember
      $ (3,245,000)us-gaap_StockholdersEquity
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_TreasuryStockMember
  $ 5,000us-gaap_StockholdersEquity
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBPreferredStockMember