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Variable Interest Entities Text Tag (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2010 | Mar. 31, 2007 | Mar. 31, 2018
Entity Information [Line Items] |  |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  |  |  |  | $ 13,000
Variable Interest Entity, Funded Exposure, Equity Invesment |  |  |  |  | 405
% of Carver Statutory Trust I owned | 100.00% |  |  |  |
Variable Interest Entity, Rights Transferred |  |  |  |  | 69,500
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  |  |  |  | 27,105
New Markets Tax Credit Award |  | $ 25,000 | $ 65,000 | $ 59,000 |
Carver Statutory Trust 1 |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment | $ 13,000 |  |  |  | 13,000
Variable Interest Entity, Funded Exposure, Equity Invesment | $ 400 |  |  |  | 400
Variable Interest Entity, Rights Transferred |  |  |  |  | 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount |  |  |  |  | $ 0

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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: | duration

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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

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

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- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5747-111685 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=108788376&loc=d3e5728-111685 + Details
Name: | us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=carv_CarverStatutoryTrust1MemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |