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Variable Interest Entities Text Tag (Details) (USD $) | 12 Months Ended |  |  |  |  |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2014 | Sep. 30, 2011 | Dec. 30, 2010 | May 15, 2009 | Apr. 28, 2006 | Mar. 31, 2014 Carver Statutory Trust 1 [Member] | Mar. 31, 2013 Carver Statutory Trust 1 [Member] | Mar. 31, 2014 CDE 10 [Member] | Mar. 31, 2008 CDE 10 [Member] | Mar. 31, 2014 CDE 1-9, CDE 11-12 [Member] | Dec. 31, 2010 CDE 1-9, CDE 11-12 [Member]
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  | $ 13,000,000 |  |  |  |  |  | $ 13,000,000 |  | $ 13,000,000 | $ 0 |  |  | $ 0 |  |
Variable Interest Entity, Funded Exposure, Equity Invesment |  | 0 | [1] |  |  |  |  | 400,000 | [1] | 400,000 | 0 | [1] |  | 0 | [1] |
% of Carver Statutory Trust I owned | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash |  |  |  |  | 6,700,000 |  |  |  |  |  |  |  |  |  |  |
New Markets Tax Credit Award |  |  |  | 25,000,000 |  | 65,000,000 | 59,000,000 |  |  |  |  |  |  |  |  |
Variable Interest Entity, Rights Transferred |  | 149,000,000 |  |  |  | 40,000,000 |  | 0 |  |  | 19,000,000 |  | 19,000,000 | 40,000,000 |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 6,700,000
[1] | (1) Excludes any proceeds realized from exchange of equity interest in CDEs as detailed below.

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- Definition New Market Tax Credit Award + References No definition available. + Details
Name: | carv_NewMarketTaxCreditAward
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition % of Carver Statutory Trust I owned + References No definition available. + Details
Name: | carv_OfCarverStatutoryTrustIOwned
Namespace Prefix: | carv_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Variable Interest Entity, Funded Exposure, Debt Investment + References No definition available. + Details
Name: | carv_VariableInterestEntityFundedExposureDebtInvestment
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Variable Interest Entity, Funded Exposure, Equity Invesment + References No definition available. + Details
Name: | carv_VariableInterestEntityFundedExposureEquityInvesment
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Variable Interest Entity, Rights Transferred + References No definition available. + Details
Name: | carv_VariableInterestEntityRightsTransferred
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Details
Name: | dei_EntityInformationLineItems
Namespace Prefix: | dei_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Cash -URI http://asc.fasb.org/extlink&oid=6506951 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 1 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_Cash
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Carrying amount of the equity interests owned by noncontrolling partners of a limited partnership included in the entity's consolidated financial statements. + References No definition available. + Details
Name: | us-gaap_MinorityInterestInLimitedPartnerships
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant