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Earnings (Loss) Per Common Share (Computation of Earnings Per Share) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Basic      
Net income (loss) $ 479us-gaap_NetIncomeLoss $ (918)us-gaap_NetIncomeLoss $ (3,766)us-gaap_NetIncomeLoss
Less: Preferred dividends and accretion of discount on preferred stock     4,632cfbk_PreferredStockDividendsAndOtherAdjustmentsNetOfPreferredStockRedemption
Less: Net loss allocated to unvested share-based payment awards (421)cfbk_NetLossAllocatedToUnvestedShareBasedPaymentAwards    
Net earnings (loss) allocated to common stockholders 58cfbk_NetIncomeLossAvailableToCommonStockholdersBasicNetOfUnvestedShareBasedPaymentAwards (918)cfbk_NetIncomeLossAvailableToCommonStockholdersBasicNetOfUnvestedShareBasedPaymentAwards 866cfbk_NetIncomeLossAvailableToCommonStockholdersBasicNetOfUnvestedShareBasedPaymentAwards
Weighted average common shares outstanding for basic loss per common share 15,823,710us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 15,823,834us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements 6,317,032us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Less: Unvested share-based payment awards   (210)us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends (2,331)us-gaap_IncrementalCommonSharesAttributableToNonvestedSharesWithForfeitableDividends
Average shares 15,823,710us-gaap_WeightedAverageNumberOfSharesIssuedBasic 15,823,624us-gaap_WeightedAverageNumberOfSharesIssuedBasic 6,314,701us-gaap_WeightedAverageNumberOfSharesIssuedBasic
Basic earnings (loss) per common share $ 0.00us-gaap_EarningsPerShareBasic $ (0.06)us-gaap_EarningsPerShareBasic $ 0.14us-gaap_EarningsPerShareBasic
Diluted      
Net earnings (loss) allocated to common stockholders $ 58us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ (918)us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted $ 866us-gaap_NetIncomeLossAvailableToCommonStockholdersDiluted
Add: Dilutive effects of assumed exercises of stock options 30,279cfbk_DilutiveEffectOfEmployeeStockOptionsSharesUsedInComputation   948cfbk_DilutiveEffectOfEmployeeStockOptionsSharesUsedInComputation
Average shares and dilutive potential common shares 15,853,989us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 15,823,624us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 6,315,649us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings (loss) per common share $ 0.00us-gaap_EarningsPerShareDiluted $ (0.06)us-gaap_EarningsPerShareDiluted $ 0.14us-gaap_EarningsPerShareDiluted