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Parent Company Only Condensed Financial Information (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013
Parent Company Only Condensed Financial Information [Abstract] |  |
Total original investment into joint ventures | $ 2,184 us-gaap_PaymentsToAcquireInterestInJointVenture | $ 1,139 us-gaap_PaymentsToAcquireInterestInJointVenture
Incentive payment recognized as income | $ 223 cfbk_JointVentureIncentivePayment | $ 102 cfbk_JointVentureIncentivePayment

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- Definition Joint Venture Incentive Payment + References No definition available. + Details
Name: | cfbk_JointVentureIncentivePayment
Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | us-gaap_CondensedFinancialInformationOfParentCompanyOnlyDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The cash outflow associated with the investment in or advances to an entity in which the reporting entity shares control of the entity with another party or group. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireInterestInJointVenture
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration