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Summary of Significant Accounting Policies Text Tags (Details) $ in Thousands | Dec. 31, 2020 USD ($) | Sep. 30, 2020 USD ($)
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Accounting Policies [Abstract] |  |
Financing Receivable, Number of Principal and Interest Payment Deferrals | 12 | 85
Financing Receivable, Principal and Interest Deferred Payments | $ 4,800 | $ 92,800
Number of Loans Originated Under the Paycheck Protection Program | 203 |
Loans Originated Under the Paycheck Protection Program, Amount | $ 34,700 |
Advances under Paycheck Protection Program Liquidity Facility | $ 28,200 |

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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