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Loan Receivable and Allowance for Loan and Lease Losses Text Figures (Details) (USD $) | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Mar. 31, 2014
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | 2us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 3us-gaap_FinancingReceivableModificationsNumberOfContracts2 | 3us-gaap_FinancingReceivableModificationsNumberOfContracts2 |
Financing Receivable, Modifications, Post-Modification Recorded Investment | $ 93,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 | $ 428,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 | $ 949,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 | $ 1,694,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 93,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 | 429,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 | 966,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 | 1,832,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 |
Loans held-for-sale (HFS) | 2,606,000us-gaap_LoansHeldForSaleFairValueDisclosure |  | 2,606,000us-gaap_LoansHeldForSaleFairValueDisclosure |  | 5,011,000us-gaap_LoansHeldForSaleFairValueDisclosure
Financing Receivable, Recorded Investment, Nonaccrual Status | 8,549,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus |  | 8,549,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus |  | 12,559,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Decrease in non-accrual loans |  |  | (4,000,000)carv_Decreaseinnonaccrualloans |  |
Percentage decrease in non-accrual loans |  |  | (31.90%)carv_Percentagedecreaseinnonaccrualloans |  |
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 5,927,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue |  | 5,927,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue |  | 8,988,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue
Impaired and non performing TDR loans |  |  | 3,700,000carv_ImpairedAndNonPerformingTdrLoans |  | 3,000,000carv_ImpairedAndNonPerformingTdrLoans
Other non-performing asset |  |  | 6,500,000carv_OtherNonPerformingAsset |  |
Other Real Estate, Foreclosed Assets, and Repossessed Assets | 3,934,000us-gaap_OtherRealEstateAndForeclosedAssets |  | 3,934,000us-gaap_OtherRealEstateAndForeclosedAssets |  | 1,369,000us-gaap_OtherRealEstateAndForeclosedAssets
Number of Real Estate Properties | 9us-gaap_NumberOfRealEstateProperties |  | 9us-gaap_NumberOfRealEstateProperties |  | 8us-gaap_NumberOfRealEstateProperties
Number of Modified Loan Subsequently Defaulted |  |  | 0carv_NumberOfModifiedLoanSubsequentlyDefaulted |  |
Number of TDR loans on accrual status |  |  | 12carv_NumberOfTdrLoansOnAccrualStatus |  | 14carv_NumberOfTdrLoansOnAccrualStatus
TDR Loans on Accrual Status | 4,700,000carv_TdrLoansOnAccrualStatus |  | 4,700,000carv_TdrLoansOnAccrualStatus |  | 6,300,000carv_TdrLoansOnAccrualStatus
number of loans to related parties | 0carv_Numberofloanstorelatedparties |  | 0carv_Numberofloanstorelatedparties |  |
Non accrual 90 days past due |  |  | 4,800,000carv_Nonaccrual90dayspastdue |  |
Commercial Real Estate [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | 0us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 856,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 873,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,850,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 2,850,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 7,024,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 1,115,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 1,115,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember |  | 3,891,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
One- to four family loans [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts |  | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember | 2us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 43,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember | 428,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember | 43,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember | 975,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 43,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember | 429,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember | 43,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember | 913,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember |
Financing Receivable, Recorded Investment, Nonaccrual Status | 3,089,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember |  | 3,089,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember |  | 2,301,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | 3,011,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember |  | 3,011,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember |  | 1,863,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember
Business [Member] |  |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |  |
Financing Receivable, Modifications, Number of Contracts | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember | 0us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember | 1us-gaap_FinancingReceivableModificationsNumberOfContracts2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember |
Financing Receivable, Modifications, Post-Modification Recorded Investment | 50,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember | 0us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember | 50,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember | 719,000us-gaap_FinancingReceivableModificationsPostModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember |
Financing Receivable, Modifications, Pre-Modification Recorded Investment | 50,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember | 0us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember | 50,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember | 919,000us-gaap_FinancingReceivableModificationsPreModificationRecordedInvestment2 / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember |
Financing Receivable, Recorded Investment, Nonaccrual Status | 1,550,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember |  | 1,550,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember |  | 993,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember
Financing Receivable, Recorded Investment, Equal to Greater than 90 Days Past Due | $ 741,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember |  | $ 741,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember |  | $ 993,000us-gaap_FinancingReceivableRecordedInvestmentEqualToGreaterThan90DaysPastDue / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember

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- Definition Number of TDR loans on accrual status + References No definition available. + Details
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- Definition Percentage decrease in non-accrual loans + References No definition available. + Details
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- Definition TDR Loans on Accrual Status + References No definition available. + Details
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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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- Definition Post-modification amount of investment in financing receivables modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953676-111524 + Details
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- Definition Financing receivables that are equal to or greater than 90 days past due. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=28368275&loc=SL6953401-111524 + Details
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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5111-111524 + 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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