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Loan Receivable and Allowance for Loan and Lease Losses Non-performing loans (Details) (USD $) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2014 | Mar. 31, 2014
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans Held-for-sale, Fair Value Disclosure | $ 2,606,000us-gaap_LoansHeldForSaleFairValueDisclosure | $ 5,011,000us-gaap_LoansHeldForSaleFairValueDisclosure
Other Real Estate, Foreclosed Assets, and Repossessed Assets | 3,934,000us-gaap_OtherRealEstateAndForeclosedAssets | 1,369,000us-gaap_OtherRealEstateAndForeclosedAssets
Financing Receivable, Recorded Investment, Nonaccrual Status | 8,549,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus | 12,559,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Non accrual 90 days past due | 4,800,000carv_Nonaccrual90dayspastdue |
Impaired and non performing TDR loans | 3,700,000carv_ImpairedAndNonPerformingTdrLoans | 3,000,000carv_ImpairedAndNonPerformingTdrLoans
Consumer Loan [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 7,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerLoanMember | 1,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_ConsumerLoanMember
One- to four family loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 3,089,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember | 2,301,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_OneToFourFamilyLoansMember
Multifamily Loans [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 1,053,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_MultifamilyLoansMember | 2,240,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = carv_MultifamilyLoansMember
Commercial Real Estate [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 2,850,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember | 7,024,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialRealEstatePortfolioSegmentMember
Business [Member] |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 1,550,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember | $ 993,000us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus / us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis = us-gaap_CommercialLoanMember

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- Definition Impaired and non performing TDR loans with associated allowance + References No definition available. + Details
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- Definition Non accrual 90 days past due + References No definition available. + 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 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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