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FHLB Advances (Advances From FHLB) (Details) (USD $) In Thousands, unless otherwise specified | Jan. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |
Fixed interest rate | 1.70%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate |  |
Total fixed rate advances |  | $ 14,500 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate | $ 10,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate
January 2014 [Member] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |
Fixed interest rate |  |  | 3.12%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_StatementScenarioAxis = cfbk_JanuaryTwoThousandFourteenMember
Total fixed rate advances |  |  | 5,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate / us-gaap_StatementScenarioAxis = cfbk_JanuaryTwoThousandFourteenMember
May 2014 [Member] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |
Fixed interest rate |  |  | 3.06%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_StatementScenarioAxis = cfbk_MayTwoThousandFourteenMember
Total fixed rate advances |  |  | 5,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate / us-gaap_StatementScenarioAxis = cfbk_MayTwoThousandFourteenMember
January 2015 [Member] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |
Fixed interest rate |  | 0.35%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_StatementScenarioAxis = cfbk_JanuaryTwoThousandFifteenMember |
Total fixed rate advances |  | 2,500 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate / us-gaap_StatementScenarioAxis = cfbk_JanuaryTwoThousandFifteenMember |
May 2016 [Member] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |
Fixed interest rate |  | 0.66%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_StatementScenarioAxis = cfbk_MayTwentySixteenMember |
Total fixed rate advances |  | 3,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate / us-gaap_StatementScenarioAxis = cfbk_MayTwentySixteenMember |
November 2016 [Member] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |
Fixed interest rate |  | 0.90%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_StatementScenarioAxis = cfbk_NovemberTwentySixteenMember |
Total fixed rate advances |  | 2,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate / us-gaap_StatementScenarioAxis = cfbk_NovemberTwentySixteenMember |
September 2017 [Member] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |
Fixed interest rate |  | 1.35%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_StatementScenarioAxis = cfbk_September2017Member |
Total fixed rate advances |  | 1,500 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate / us-gaap_StatementScenarioAxis = cfbk_September2017Member |
July 2020 [Member] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |
Fixed interest rate |  | 2.27%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_StatementScenarioAxis = cfbk_July2020Member |
Total fixed rate advances |  | 2,500 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate / us-gaap_StatementScenarioAxis = cfbk_July2020Member |
July 2021 [Member] |  |  |
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items] |  |  |
Fixed interest rate |  | 2.53%us-gaap_FederalHomeLoanBankAdvancesBranchOfFHLBBankInterestRate / us-gaap_StatementScenarioAxis = cfbk_July2021Member |
Total fixed rate advances |  | $ 3,000 us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryByInterestRateTypeFixedRate / us-gaap_StatementScenarioAxis = cfbk_July2021Member |

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- Definition Discloses the single interest rate [if] applicable to the advances from the Federal Home Loan Bank, by branch, as of the Balance Sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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- Definition Amount of Federal Home Loan Bank (FHLB) advances which have fixed interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6479336&loc=d3e64711-112823 + Details
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