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Fair Value Measurements Assets within Level 3 of Valuation Hierarchy (Details) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Available-for-sale |  |  |  |  | $ 89,461,000us-gaap_AvailableForSaleSecurities |  |  |
Available-for-sale | 100,448,000us-gaap_AvailableForSaleSecurities |  |  |  | 100,448,000us-gaap_AvailableForSaleSecurities |  |  |
Change in unrealized loss of securities available-for sale | 1,103,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  | (1,546,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  | 2,817,000us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |  | (6,979,000)us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax |
Mortgage servicing rights |  |  |  |  | 265,000us-gaap_ServicingAssetAtFairValueAmount |  |  |
Mortgage servicing rights | 211,000us-gaap_ServicingAssetAtFairValueAmount |  |  |  | 211,000us-gaap_ServicingAssetAtFairValueAmount |  |  |
Fair Value, Inputs, Level 3 [Member] |  |  |  |  |  |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |  |  |  |  |  |
Available-for-sale |  |  |  |  | 49,000us-gaap_AvailableForSaleSecurities / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 50,000us-gaap_AvailableForSaleSecurities / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |
Available-for-sale Securities, Gross Unrealized Gain (Loss) |  |  |  |  | 0us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 0us-gaap_AvailableforsaleSecuritiesGrossUnrealizedGainLoss1 / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |
Proceeds from Maturities, Prepayments and Calls of Available-for-sale Securities |  |  |  |  | (2,000)us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | (1,000)us-gaap_ProceedsFromMaturitiesPrepaymentsAndCallsOfAvailableForSaleSecurities / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers, Net |  |  |  |  | 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 0us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetTransfersNet / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |
Available-for-sale | 47,000us-gaap_AvailableForSaleSecurities / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 49,000us-gaap_AvailableForSaleSecurities / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 47,000us-gaap_AvailableForSaleSecurities / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 49,000us-gaap_AvailableForSaleSecurities / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |
Change in unrealized loss of securities available-for sale |  |  |  |  | 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 0us-gaap_OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodNetOfTax / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |
Mortgage servicing rights |  |  |  |  | 265,000us-gaap_ServicingAssetAtFairValueAmount / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 275,000us-gaap_ServicingAssetAtFairValueAmount / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |
Mortgage Servicing unrealized loss | (54,000)carv_MortgageServicingUnrealizedLoss / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member | [1] | 6,000carv_MortgageServicingUnrealizedLoss / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member | [1] | (54,000)carv_MortgageServicingUnrealizedLoss / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member | [1] | 6,000carv_MortgageServicingUnrealizedLoss / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member | [1]
Payments for (Proceeds from) Mortgage Servicing Rights |  |  |  |  | 0us-gaap_PaymentsForProceedsFromMortgageServicingRights / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 0us-gaap_PaymentsForProceedsFromMortgageServicingRights / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |
Mortgage servicing rights | 211,000us-gaap_ServicingAssetAtFairValueAmount / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 281,000us-gaap_ServicingAssetAtFairValueAmount / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 211,000us-gaap_ServicingAssetAtFairValueAmount / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | 281,000us-gaap_ServicingAssetAtFairValueAmount / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |
Change in unrealized gains and losses to instruments held |  |  |  |  | $ (52,000)carv_ChangeInUnrealizedGainsAndLossesToInstrumentsHeld / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |  | $ 5,000carv_ChangeInUnrealizedGainsAndLossesToInstrumentsHeld / carv_Level3ClassifiedAssetsAxis = us-gaap_FairValueInputsLevel3Member |
[1] | (1) Includes net servicing cash flows and the passage of time.

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 + Details
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- Definition Amount of unrealized gain (loss) on investments in debt and equity securities classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Amount of transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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- Definition The net cash outflow or inflow associated with acquisition or sale of mortgage servicing rights which is the net carrying value of capitalized servicing rights, which contractually entitle the servicer to receive fees and ancillary revenues for performing billing, collection, disbursement and recordkeeping services in connection with a mortgage portfolio. Rights may be obtained via (1) acquisition or assumption of a servicing obligation that does not relate to financial assets of the servicer or its consolidated affiliates; or (2) by originating mortgage loans and then (a) transferring the loans to a Variable Interest Entity (VIE) in a transaction that meets the necessary transfer and classification requirements, or (b) transferring the loans in a transaction that meets the requirements for sale accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 + Details
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- Definition The cash inflow associated with maturities (principal being due), prepayments and calls (requests of early payments) on securities not classified as either held-to-maturity securities or trading securities which are classified as available-for-sale securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26853-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 50 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746 + Details
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