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Fair Value Measurements Fair Value on a Non-recurring basis (Details) (USD $) | Dec. 31, 2014 | Mar. 31, 2014
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale (HFS) | $ 2,606,000us-gaap_LoansHeldForSaleFairValueDisclosure | $ 5,011,000us-gaap_LoansHeldForSaleFairValueDisclosure
Impaired Loans with Specific Reserve Allocated | 11,103,000carv_ImpairedLoansWithSpecificReserveAllocated | 15,918,000carv_ImpairedLoansWithSpecificReserveAllocated
Other Real Estate, Foreclosed Assets, and Repossessed Assets | 3,934,000us-gaap_OtherRealEstateAndForeclosedAssets | 1,369,000us-gaap_OtherRealEstateAndForeclosedAssets
Fair Value, Inputs, Level 1 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale (HFS) | 0us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Impaired Loans with Specific Reserve Allocated | 0carv_ImpairedLoansWithSpecificReserveAllocated / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0carv_ImpairedLoansWithSpecificReserveAllocated / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Other Real Estate, Foreclosed Assets, and Repossessed Assets | 0us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member | 0us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel1Member
Fair Value, Inputs, Level 2 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale (HFS) | 2,606,000us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 5,011,000us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Impaired Loans with Specific Reserve Allocated | 0carv_ImpairedLoansWithSpecificReserveAllocated / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member | 0carv_ImpairedLoansWithSpecificReserveAllocated / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Other Real Estate, Foreclosed Assets, and Repossessed Assets |  | 1,369,000us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel2Member
Fair Value, Inputs, Level 3 [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Loans held-for-sale (HFS) | 0us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 0us-gaap_LoansHeldForSaleFairValueDisclosure / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Impaired Loans with Specific Reserve Allocated | 11,103,000carv_ImpairedLoansWithSpecificReserveAllocated / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | 15,918,000carv_ImpairedLoansWithSpecificReserveAllocated / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member
Other Real Estate, Foreclosed Assets, and Repossessed Assets | $ 0us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member | $ 0us-gaap_OtherRealEstateAndForeclosedAssets / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member

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- Definition Impaired Loans with Specific Reserve Allocated + References No definition available. + Details
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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of other real estate and foreclosed assets. Other real estate may include real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. Foreclosed assets include all assets obtained in full or partial satisfaction of a debt arrangement through foreclosure proceedings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.10(4)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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