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Commitments and Contingencies Commitments and Contingencies-Repurchase Request (Details) $ in Thousands | 12 Months Ended
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Mar. 31, 2018 USD ($)
Repurchase request [Abstract] |  |
Open claims, beginning balance | $ 2,044 | [1]
Gross new demands received | 0 |
Loan repurchased/made whole | 0 |
Demands rescinded | 0 |
Advances on open claims | 0 |
Principal payments received on open claims | (31) |
Open claims, ending balance | $ 2,013 | [1]
[1] | (1) The open claims include all open requests received by the Bank where either FNMA has requested loan files for review, where FNMA has not formally rescinded the repurchase request or where the Bank has not agreed to repurchase the loan. The amounts reflected in this table are the unpaid principal balance and do not incorporate any losses the Bank would incur upon the repurchase of these loans.

X
- Definition Advances on open claims + References No definition available. + Details
Name: | carv_Advancesonopenclaims
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Demands rescinded + References No definition available. + Details
Name: | carv_DemandsRescinded
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Gross new demands received + References No definition available. + Details
Name: | carv_GrossNewDemandsReceived
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Loan repurchased/made whole + References No definition available. + Details
Name: | carv_LoanRepurchasedmadeWhole
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Open claims + References No definition available. + Details
Name: | carv_Openclaims
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Principal payments received on open claims + References No definition available. + Details
Name: | carv_Principalpaymentsreceivedonopenclaims
Namespace Prefix: | carv_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Repurchase request [Abstract] + References No definition available. + Details
Name: | carv_RepurchaseRequestAbstract
Namespace Prefix: | carv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration