LOANS AND ALLOWANCE FOR LOAN LOSSES (Details 9) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2016 USD ($) TDR loan	Mar. 31, 2015 USD ($) TDR loan	Dec. 31, 2015 USD ($) loan
Financing Receivable, Modifications [Line Items]
Recorded Investment	$ 6,724		$ 7,270
Number (in loans) \| loan	21		25
TDRs Modified, Recorded Investment	$ 124	$ 398
TDRs modified (in loans) \| loan	1	1
Number of troubled debt restructurings \| TDR	1	0
Financing receivable, modifications, subsequent default, recorded investment	$ 353
Commercial real estate
Financing Receivable, Modifications [Line Items]
Recorded Investment	$ 4,673		$ 4,684
Number (in loans) \| loan	7		7
TDRs Modified, Recorded Investment	$ 124	$ 0
TDRs modified (in loans) \| loan	1	0
Commercial and industrial
Financing Receivable, Modifications [Line Items]
Recorded Investment	$ 884		$ 795
Number (in loans) \| loan	10		11
Commercial construction
Financing Receivable, Modifications [Line Items]
Recorded Investment	$ 175		$ 177
Number (in loans) \| loan	2		2
Residential real estate
Financing Receivable, Modifications [Line Items]
Recorded Investment	$ 992		$ 1,594
Number (in loans) \| loan	2		4
TDRs Modified, Recorded Investment	$ 0	$ 398
TDRs modified (in loans) \| loan	0	1
Home equity
Financing Receivable, Modifications [Line Items]
Recorded Investment	$ 0		$ 20
Number (in loans) \| loan	0		1

Financing Receivable, Modifications, Post-Modification Recorded Investment, Number

No definition available.

Name:	crfn_FinancingReceivableModificationsPostModificationRecordedInvestmentNumber
Namespace Prefix:	crfn_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_FinancingReceivableModificationsLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Post-modification amount of investment in financing receivables modified by troubled debt restructurings.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of the outstanding recorded investment related to financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

+ Details

Name:	us-gaap_FinancingReceivableModificationsRecordedInvestment
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953682-111524

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default.

+ References

+ Details

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultRecordedInvestment1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=crfn_CommercialAndIndustrialLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=crfn_CommercialConstructionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_ResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_HomeEquityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: