INVESTMENT SECURITIES - Narrative (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014 investment_security	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Number of available for sale securities with an unrealized loss position for more than 12 months	66
Available for sale securities in unrealized loss position for more than twelve months	$ 3,217	$ 0
Investment securities, as a percentage of total stockholders' equity	10.00%crfn_InvestmentSecuritiesPercentage
Carrying amount of investment securities pledged as collateral	314,184	226,048
Mortgage-backed securities issued by GSE
Schedule of Available-for-sale Securities [Line Items]
Number of mortgage obligations	76	65
Available for sale securities in unrealized loss position for more than twelve months	2,762	0
SBA-guaranteed securities
Schedule of Available-for-sale Securities [Line Items]
Number of mortgage obligations	19	23
Available for sale securities in unrealized loss position for more than twelve months	371	0
Corporate bonds
Schedule of Available-for-sale Securities [Line Items]
Number of mortgage obligations	5	6
Available for sale securities in unrealized loss position for more than twelve months	84	0
Marketable equity securities
Schedule of Available-for-sale Securities [Line Items]
Number of mortgage obligations	4
Available for sale securities in unrealized loss position for more than twelve months	0
GSE Securities
Schedule of Available-for-sale Securities [Line Items]
Number of mortgage obligations	1	2
Non-agency RMBS
Schedule of Available-for-sale Securities [Line Items]
Number of mortgage obligations	1
Available for sale securities in unrealized loss position for more than twelve months	0
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Number of mortgage obligations	6
Available for sale securities in unrealized loss position for more than twelve months	$ 0

Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Month or Longer, Number of Securities

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- Definition

Percentage of the investment securities held.

+ References

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- Definition

Number of Available for Sale Securities with Unrealized Losses

+ References

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- Definition

Amount of accumulated unrealized loss on investments in debt and equity securities classified as available-for-sale that have been in a continuous loss position for twelve months or longer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 7

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27337-111563

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 50

-Paragraph 6

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27290-111563

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- Definition

Amount of securities, mortgage loans, or other financial instruments pledged as collateral for deposits.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 405

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=6479006&loc=d3e64164-112818

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