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Summary of Significant Accounting Policies Text Tags (Details) $ in Thousands | Jun. 30, 2021 USD ($) | Mar. 31, 2021 USD ($)
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Accounting Policies [Abstract] |  |
Financing Receivable, Number of Principal and Interest Payment Deferrals | 11 | 77
Financing Receivable, Principal and Interest Deferred Payments | $ 6,600 | $ 77,700
Number of Loans Originated Under the Paycheck Protection Program | 419 |
Loans Originated Under the Paycheck Protection Program, Amount | $ 56,400 |
Advances under Paycheck Protection Program Liquidity Facility | $ 19,200 |

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- Definition Advances under Paycheck Protection Program Liquidity Facility (PPPLF) + References No definition available. + Details
Name: | carv_AdvancesUnderPaycheckProtectionProgramLiquidityFacility
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Number of principal and interest payment deferrals on loans receivable related to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
Name: | carv_FinancingReceivableNumberOfPrincipalAndInterestPaymentDeferrals
Namespace Prefix: | carv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition The total amount of financing receivable which has deferred principal and interest payments due to loan modification programs offered to financial institution customers affected by COVID-19. + References No definition available. + Details
Name: | carv_FinancingReceivablePrincipalAndInterestDeferredPayments
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Represents the aggregate dollar amount of loans that have been originated under the Paycheck Protection Program. + References No definition available. + Details
Name: | carv_LoansOriginatedUnderThePaycheckProtectionProgramAmount
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of Loans Originated Under the Paycheck Protection Program + References No definition available. + Details
Name: | carv_NumberOfLoansOriginatedUnderThePaycheckProtectionProgram
Namespace Prefix: | carv_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration