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Parent Company Only Condensed Financial Information (Condensed Balance Sheets) (Details) (USD $) In Thousands, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2003
--- | --- | --- | --- | --- | ---
ASSETS |  |  |  |  |
Cash and cash equivalents | $ 28,207 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 19,160 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 25,152 us-gaap_CashAndCashEquivalentsAtCarryingValue | $ 61,436 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Other assets | 3,088 us-gaap_OtherAssets | 2,848 us-gaap_OtherAssets |  |  |
Total assets | 315,588 us-gaap_Assets | 255,748 us-gaap_Assets |  |  |
Liabilities and Equity |  |  |  |  |
Subordinated debentures | 5,155 us-gaap_SubordinatedDebt | 5,155 us-gaap_SubordinatedDebt |  |  | 5,155 us-gaap_SubordinatedDebt
Stockholders' equity | 34,509 us-gaap_StockholdersEquity | 22,864 us-gaap_StockholdersEquity | 23,643 us-gaap_StockholdersEquity | 9,944 us-gaap_StockholdersEquity |
Total liabilities and stockholder's equity | 315,588 us-gaap_LiabilitiesAndStockholdersEquity | 255,748 us-gaap_LiabilitiesAndStockholdersEquity |  |  |
Parent Company [Member] |  |  |  |  |
ASSETS |  |  |  |  |
Cash and cash equivalents | 3,025 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 3,263 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 4,673 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 560 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Investment in banking subsidiary | 34,572 cfbk_InvestmentInBankingSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 23,592 cfbk_InvestmentInBankingSubsidiary / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Investment in and advances to other subsidiaries | 220 cfbk_InvestmentInAndAdvancesToOtherSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 273 cfbk_InvestmentInAndAdvancesToOtherSubsidiaries / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other assets | 2,202 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 1,155 us-gaap_OtherAssets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total assets | 40,019 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 28,283 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Liabilities and Equity |  |  |  |  |
Subordinated debentures | 5,155 us-gaap_SubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 5,155 us-gaap_SubordinatedDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Accrued expenses and other liabilities | 355 cfbk_AccruedExpensesAndOtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 264 cfbk_AccruedExpensesAndOtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Stockholders' equity | 34,509 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | 22,864 us-gaap_StockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total liabilities and stockholder's equity | $ 40,019 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember | $ 28,283 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |

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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash Equivalents -URI http://asc.fasb.org/extlink&oid=6507016 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28358313&loc=d3e6676-107765 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3044-108585 + Details
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