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Commitments and Contingencies Repurchase request (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Pending Repurchase Request by counterparty [Line Items] |  |
Open claims, begining balance | $ 4,851 | $ 0
Gross new demands received | 8,576 |
Loan repurchased/made whole | (3,725) |
Demands rescinded | $ 0 |

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- Definition Demands rescinded + References No definition available.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

X
- Details
Name: | carv_PendingRepurchaseRequestByCounterpartyLineItems
Namespace Prefix: | carv_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration