LOANS AND ALLOWANCE FOR LOAN LOSSES- Past Due Analysis and Aging (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Consumer:
Total	$ 2,899,037	$ 1,393,321
30-89 Days Past Due
Commercial:
Commercial, Real estate	7,971	2,419
Commercial, Commercial and industrial	5,612	1,945
Commercial, Construction and development	1,162	146
Consumer:
Consumer, Residential real estate	4,872	5,097
Consumer, Construction and development	569	603
Consumer, Home equity	3,985	990
Consumer, Other consumer	797	245
Total	24,968	11,445
90 Days or Greater Past Due
Commercial:
Commercial, Real estate	2,383	2,142
Commercial, Commercial and industrial	1,707	505
Commercial, Construction and development	369	1,316
Consumer:
Consumer, Residential real estate	2,210	1,365
Consumer, Construction and development	12	237
Consumer, Home equity	395	701
Consumer, Other consumer	70	136
Total	7,146	6,402
Total Past Due
Commercial:
Commercial, Real estate	10,354	4,561
Commercial, Commercial and industrial	7,319	2,450
Commercial, Construction and development	1,531	1,462
Consumer:
Consumer, Residential real estate	7,082	6,462
Consumer, Construction and development	581	840
Consumer, Home equity	4,380	1,691
Consumer, Other consumer	867	381
Total	32,114	17,847
Current
Commercial:
Commercial, Real estate	1,222,641	562,110
Commercial, Commercial and industrial	447,511	217,144
Commercial, Construction and development	336,919	139,058
Consumer:
Consumer, Residential real estate	322,539	158,339
Consumer, Construction and development	27,855	19,849
Consumer, Home equity	267,954	91,325
Consumer, Other consumer	35,377	7,614
Total	2,660,796	1,195,439
Total
Commercial:
Commercial, Real estate	1,232,995	566,671
Commercial, Commercial and industrial	454,830	219,594
Commercial, Construction and development	338,450	140,520
Consumer:
Consumer, Residential real estate	329,621	164,801
Consumer, Construction and development	28,436	20,689
Consumer, Home equity	272,334	93,016
Consumer, Other consumer	36,244	7,995
Total	2,692,910	1,213,286
Non-PCI Loans
Commercial:
Commercial, Real estate	1,232,995	566,671
Commercial, Commercial and industrial	454,830	219,594
Commercial, Construction and development	338,450	140,520
Consumer:
Consumer, Residential real estate	329,621	164,801
Consumer, Construction and development	28,436	20,689
Consumer, Home equity	272,334	93,016
Consumer, Other consumer	36,244	7,995
Total	2,692,910	1,213,286
Non-PCI Loans \| Pass
Commercial:
Commercial, Real estate	1,187,938	532,669
Commercial, Commercial and industrial	433,093	210,382
Commercial, Construction and development	334,213	134,074
Consumer:
Consumer, Residential real estate	316,743	153,123
Consumer, Construction and development	27,447	19,566
Consumer, Home equity	264,953	87,891
Consumer, Other consumer	35,736	7,773
Total	2,600,123	1,145,478
Non-PCI Loans \| Special Mention
Commercial:
Commercial, Real estate	32,142	24,245
Commercial, Commercial and industrial	15,148	5,195
Commercial, Construction and development	2,128	3,400
Consumer:
Consumer, Residential real estate	4,527	7,812
Consumer, Construction and development	735	921
Consumer, Home equity	4,238	2,524
Consumer, Other consumer	237	43
Total	59,155	44,140
Non-PCI Loans \| Substandard
Commercial:
Commercial, Real estate	12,915	9,757
Commercial, Commercial and industrial	6,510	3,993
Commercial, Construction and development	2,109	2,847
Consumer:
Consumer, Residential real estate	8,351	3,866
Consumer, Construction and development	254	202
Consumer, Home equity	3,143	2,601
Consumer, Other consumer	269	179
Total	33,551	23,445
Non-PCI Loans \| Doubtful
Commercial:
Commercial, Real estate	0	0
Commercial, Commercial and industrial	79	24
Commercial, Construction and development	0	199
Consumer:
Consumer, Residential real estate	0	0
Consumer, Construction and development	0	0
Consumer, Home equity	0	0
Consumer, Other consumer	2	0
Total	81	223
PCI Loans
Commercial:
Commercial, Real estate	122,541	103,622
Commercial, Commercial and industrial	14,018	11,020
Commercial, Construction and development	32,357	35,274
Consumer:
Consumer, Residential real estate	30,628	26,577
Consumer, Construction and development	1,625	1,831
Consumer, Home equity	4,328	1,374
Consumer, Other consumer	630	337
Total	206,127	180,035
PCI Loans \| Pass
Commercial:
Commercial, Real estate	57,095	53,900
Commercial, Commercial and industrial	7,408	7,921
Commercial, Construction and development	6,857	9,666
Consumer:
Consumer, Residential real estate	12,703	13,794
Consumer, Construction and development	189	212
Consumer, Home equity	143	28
Consumer, Other consumer	2	21
Total	84,397	85,542
PCI Loans \| Special Mention
Commercial:
Commercial, Real estate	45,711	35,399
Commercial, Commercial and industrial	2,936	2,382
Commercial, Construction and development	16,374	17,408
Consumer:
Consumer, Residential real estate	8,206	7,070
Consumer, Construction and development	723	510
Consumer, Home equity	2,827	850
Consumer, Other consumer	488	281
Total	77,265	63,900
PCI Loans \| Substandard
Commercial:
Commercial, Real estate	19,735	14,323
Commercial, Commercial and industrial	3,674	669
Commercial, Construction and development	9,126	7,124
Consumer:
Consumer, Residential real estate	9,719	5,692
Consumer, Construction and development	713	1,109
Consumer, Home equity	1,358	496
Consumer, Other consumer	140	35
Total	44,465	29,448
PCI Loans \| Doubtful
Commercial:
Commercial, Real estate	0	0
Commercial, Commercial and industrial	0	48
Commercial, Construction and development	0	1,076
Consumer:
Consumer, Residential real estate	0	21
Consumer, Construction and development	0	0
Consumer, Home equity	0	0
Consumer, Other consumer	0	0
Total	$ 0	$ 1,145

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

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

- Definition

Amount before allowance of loans issued to build, improve or remodel a residential home. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a, b

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a)(2),(b))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Amount before allowance of revolving, open-end loan, extended under a line of credit and secured by the borrower's residential property. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a, b

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a)(3),(b))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Amount before allowance of consumer loans and leases not otherwise specified in the taxonomy. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a)(7),(b))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Amount before allowance of consumer real estate loans. Includes, but not limited to, construction financing, residential mortgage loans, and home equity lines of credit. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a, b

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a)(2),(3),(b))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements.

+ References

+ Details

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

- Definition

Amount before allowance of loans issued to commercial and industrial institutions. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes real estate loans and loans covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a)(1))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a(1)

-Article 9

+ Details

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

- Definition

Amount before allowance of commercial construction loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a)(2))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

+ Details

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

- Definition

Amount before allowance of commercial loans issued to businesses to acquire, develop, construct, improve, or refinance land or building. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=35738203&loc=d3e5066-111524

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 7

-Subparagraph a

-Article 9

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.7(a))

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.1(c))

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

- Details

Name:	us-gaap_DebtSecurityAxis=crfn_NonPCILoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtSecurityAxis=crfn_PCILoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=crfn_DaysPastDue3089Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=crfn_GreaterThan90DaysPastDueAccruingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=crfn_LoansNotPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=crfn_TotalLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=crfn_TotalPastDueMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: