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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, 2022 | Mar. 31, 2021
Entity Information [Line Items] |  |  |  |  |  |
% of Carver Statutory Trust I owned | 100.00% |  |  |  |  |
New Markets Tax Credit Award |  | $ 25,000 | $ 65,000 | $ 59,000 |  |
Accrued interest expense subordinated debt |  |  |  |  | $ 22 | $ 3,100
Carver Statutory Trust 1 |  |  |  |  |  |
Entity Information [Line Items] |  |  |  |  |  |
Variable Interest Entity, Funded Exposure, Debt Investment | $ 13,000 |  |  |  | 13,022 |
Variable Interest Entity, Funded Exposure, Equity Invesment | $ 400 |  |  |  | $ 403 |

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- Definition Accrued interest expense subordinated debt + References No definition available. + Details
Name: | carv_AccruedInterestExpenseSubordinatedDebt
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Variable Interest Entity, Funded Exposure, Debt Investment + References No definition available. + Details
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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 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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- Details
Name: | srt_ConsolidatedEntitiesAxis=carv_CarverStatutoryTrust1MemberMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |