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Fair Value (Aggregate Fair Value, Contractual Balance (Including Accrued Interest) And Gain Or Loss) (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Fair Value [Abstract] |  |
Aggregate fair value | $ 8,863 | $ 1,124
Contractual balance | 8,801 | 1,120
Gain (loss) | $ 62 | $ 4

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- Definition Fair value option loans held as assets contractual amount. + References No definition available. + Details
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Namespace Prefix: | cfbk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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- Definition For loans held as assets for which the fair value option has been elected, this item represents the difference between the aggregate fair value and the aggregate unpaid principal balance of those loans that are 90 days or more past due, in nonaccrual status, or both. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 28 -Subparagraph (e)(3) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14064-108612 + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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