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Summary of Significant Accounting Policies Text Tags (Details) $ in Thousands	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)
Accounting Policies [Abstract]
Financing Receivable, Number of Principal and Interest Payment Deferrals	7	73
Financing Receivable, Principal and Interest Deferred Payments	$ 4,100	$ 73,800
Number of Loans Originated Under the Paycheck Protection Program	420
Loans Originated Under the Paycheck Protection Program, Amount	$ 57,100
Advances under Paycheck Protection Program Liquidity Facility	$ 3,600	$ 23,700

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- Definition

Advances under Paycheck Protection Program Liquidity Facility (PPPLF)

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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.

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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.

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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.

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No definition available.

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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

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No definition available.

+ Details

Name:	carv_NumberOfLoansOriginatedUnderThePaycheckProtectionProgram
Namespace Prefix:	carv_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration