XML 57 R41.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Loan Servicing (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2017
Loan Servicing [Abstract] |
Principal Balances of Mortgage Loans at Year-End |
﻿ |  |  |  |  |
﻿ | December 31, 2017 |  | December 31, 2016
﻿Mortgage loans serviced for Freddie Mac | $ | 3,319 |  | $ | 4,261
﻿

X
- Definition Schedule Of Mortgage Loan Activity [Table Text Block] + References No definition available. + Details
Name: | cfbk_ScheduleOfMortgageLoanActivityTableTextBlock
Namespace Prefix: | cfbk_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_TransfersAndServicingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration