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

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- Definition Preferred Stock Dividends And Other Adjustments Net Of Preferred Stock Redemption + References No definition available. + Details
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- Definition The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=32703322&loc=d3e4984-109258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04.19) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.23) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 18 -Article 7 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 20 -Article 5 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 21 -Article 9 + Details
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