FAIR VALUE MEASUREMENT (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013
Recurring measurements:
Fair Value Measurements, Valuation Techniques	Discounted Appraisals
Interest Rate Lock Commitments [Member]
Recurring measurements:
Fair Value Measurements, Valuation Techniques	Pricing model
Unobservable Input	Pull through rates
Foreclosed Assets [Member]
Recurring measurements:
Fair Value Measurements, Valuation Techniques	Discounted appraisals
Unobservable Input	Collateral discounts
Maximum [Member]
Recurring measurements:
Pull Through Rate	85.00%
Collateral Discount Rate	50.00%
Minimum [Member]
Recurring measurements:
Pull Through Rate	80.00%
Collateral Discount Rate	15.00%
Successor [Member]
Nonrecurring measurements:
Foreclosed assets	4,752
Successor [Member] \| Fair Value, Measurements, Recurring [Member]
Recurring measurements:
Interest rate lock commitments	496
Impaired loans	5,470
Successor [Member] \| Fair Value, Measurements, Nonrecurring [Member]
Nonrecurring measurements:
Foreclosed assets	4,752

This represents discount rate used to revalue items held as collateral for outstanding loans.

No definition available.

Name:	crfn_CollateralDiscountRate
Namespace Prefix:	crfn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

The fair value of interest rate lock commitments on mortgage loans in the production pipeline based on servicing rate premium, origination income net of origination costs, fall out rates and changes in loan pricing between the commitment date and period end as of the date.

+ References

No definition available.

+ Details

Name:	crfn_FairValueOfInterestRateLockCommitmentsAndForwardLoanSales
Namespace Prefix:	crfn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents impaired loans at a fair value.

+ References

No definition available.

+ Details

Name:	crfn_ImpairedLoansAtFairValue
Namespace Prefix:	crfn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

In the mortgage industry the pull-through rate is a percentage that measures the dollar volume of loans that a seller delivers versus the dollar volume of loans committed for delivery.

+ References

No definition available.

+ Details

Name:	crfn_PullThroughRate
Namespace Prefix:	crfn_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Unobservable inputs reflect the reporting entitys own assumptions about market participant assumptions used in pricing an asset or liability.

+ References

No definition available.

+ Details

Name:	crfn_UnobservableInput
Namespace Prefix:	crfn_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Details

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

- Details

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

- Definition

Description of the inputs and valuation technique(s) used to measure fair value.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (bbb)

-URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258

+ Details

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

- Definition

Carrying amount as of the balance sheet date of all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings or defeasance; includes real and personal property; equity interests in corporations, partnerships, and joint ventures; and beneficial interests in trusts.

+ References

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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 01-6

-Paragraph 13

-Subparagraph f

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 45

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6375948&loc=d3e4437-111522

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

-Publisher AICPA

-Name Audit and Accounting Guide (AAG)

-Number AAG-DEP

-Paragraph 2, 9, 10, 11

-IssueDate 2006-05-01

-Chapter 11

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

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