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Variable Interest Entities Text Tag (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2013 | Mar. 31, 2016 | Sep. 30, 2011 | Dec. 31, 2010 | Dec. 30, 2010 | May 15, 2009 | Mar. 31, 2008 | Apr. 28, 2006
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment |  |  | $ 13,000 |  |  |  |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment |  |  | 0 |  |  |  |  |  |  |
% of Carver Statutory Trust I owned |  | 100.00% |  |  |  |  |  |  |  |
Cash |  |  |  |  |  |  | $ 6,700 |  |  |
New Markets Tax Credit Award |  |  |  |  | $ 25,000 |  |  | $ 65,000 |  | $ 59,000
Variable Interest Entity, Rights Transferred |  |  | 149,000 |  |  |  |  | $ 40,000 |  |
Carver Statutory Trust 1 [Member] |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
CDE 10 [Member] |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment | [1] |  | 0 |  |  |  |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment | [1] |  | 0 |  |  |  |  |  |  |
Variable Interest Entity, Rights Transferred |  |  | 19,000 | [1] |  |  |  |  | $ 19,000 |
CDE 1-9, CDE 11-12 [Member] |  |  |  |  |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |  |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment | [2] |  | 0 |  |  |  |  |  |  |
Variable Interest Entity, Funded Exposure, Equity Invesment | [2],[3] |  | 0 |  |  |  |  |  |  |
Variable Interest Entity, Rights Transferred | [2] |  | $ 40,000 |  |  |  |  |  |  |
Stockholders' Equity Attributable to Noncontrolling Interest |  |  |  |  |  | $ 6,700 |  |  |  |
[1] | (2) Entity dissolved May 2015.
[2] | (3) CDEs 2-9, 11-12 dissolved March 2016.
[3] | (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

X
- 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 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 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
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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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Data Type: | na
Balance Type: |
Period Type: |